#resistors — Public Fediverse posts

[Перевод] RESISTORS: как подростки из 1960-х работали с компьютерами до эпохи ПК

В конце апреля 1968 года компьютерная конференция в Атлантик-Сити едва не сорвалась из-за забастовки телефонисток: терминалы крупных компаний стояли мёртвые. И вот посреди этой неразберихи в центре внимания оказалась небольшая группа подростков из окрестностей Принстона. Они раздобыли акустический модем, подсоединили его к ближайшему таксофону — и вышли на связь с удалённой мини-ЭВМ. Отраслевая газета Computerworld вывела их на первую полосу с заголовком в духе «Школьники украли шоу у профессионалов». Эти ребята называли себя RESISTORS — придуманная задним числом расшифровка аббревиатуры: «Radically Emphatic Students Interested in Science, Technology, Or Research Studies» — то есть «Радикально увлечённые ученики, интересующиеся наукой, техникой и исследованиями».

https://habr.com/ru/companies/cloud4y/articles/1029094/

#RESISTORS #история_компьютеров #Тед_Нельсон #гипертекст #PDP8 #Burroughs_Datatron_205 #Клод_Каган #Project_Xanadu #Computer_Lib #история_программирования

[Перевод] RESISTORS: как подростки из 1960-х работали с компьютерами до эпохи ПК

В конце апреля 1968 года компьютерная конференция в Атлантик-Сити едва не сорвалась из-за забастовки телефонисток: терминалы крупных компаний стояли мёртвые. И вот посреди этой неразберихи в центре внимания оказалась небольшая группа подростков из окрестностей Принстона. Они раздобыли акустический модем, подсоединили его к ближайшему таксофону — и вышли на связь с удалённой мини-ЭВМ. Отраслевая газета Computerworld вывела их на первую полосу с заголовком в духе «Школьники украли шоу у профессионалов». Эти ребята называли себя RESISTORS — придуманная задним числом расшифровка аббревиатуры: «Radically Emphatic Students Interested in Science, Technology, Or Research Studies» — то есть «Радикально увлечённые ученики, интересующиеся наукой, техникой и исследованиями».

https://habr.com/ru/companies/cloud4y/articles/1029094/

#RESISTORS #история_компьютеров #Тед_Нельсон #гипертекст #PDP8 #Burroughs_Datatron_205 #Клод_Каган #Project_Xanadu #Computer_Lib #история_программирования

[Перевод] RESISTORS: как подростки из 1960-х работали с компьютерами до эпохи ПК

В конце апреля 1968 года компьютерная конференция в Атлантик-Сити едва не сорвалась из-за забастовки телефонисток: терминалы крупных компаний стояли мёртвые. И вот посреди этой неразберихи в центре внимания оказалась небольшая группа подростков из окрестностей Принстона. Они раздобыли акустический модем, подсоединили его к ближайшему таксофону — и вышли на связь с удалённой мини-ЭВМ. Отраслевая газета Computerworld вывела их на первую полосу с заголовком в духе «Школьники украли шоу у профессионалов». Эти ребята называли себя RESISTORS — придуманная задним числом расшифровка аббревиатуры: «Radically Emphatic Students Interested in Science, Technology, Or Research Studies» — то есть «Радикально увлечённые ученики, интересующиеся наукой, техникой и исследованиями».

https://habr.com/ru/companies/cloud4y/articles/1029094/

#RESISTORS #история_компьютеров #Тед_Нельсон #гипертекст #PDP8 #Burroughs_Datatron_205 #Клод_Каган #Project_Xanadu #Computer_Lib #история_программирования

[Перевод] RESISTORS: как подростки из 1960-х работали с компьютерами до эпохи ПК

В конце апреля 1968 года компьютерная конференция в Атлантик-Сити едва не сорвалась из-за забастовки телефонисток: терминалы крупных компаний стояли мёртвые. И вот посреди этой неразберихи в центре внимания оказалась небольшая группа подростков из окрестностей Принстона. Они раздобыли акустический модем, подсоединили его к ближайшему таксофону — и вышли на связь с удалённой мини-ЭВМ. Отраслевая газета Computerworld вывела их на первую полосу с заголовком в духе «Школьники украли шоу у профессионалов». Эти ребята называли себя RESISTORS — придуманная задним числом расшифровка аббревиатуры: «Radically Emphatic Students Interested in Science, Technology, Or Research Studies» — то есть «Радикально увлечённые ученики, интересующиеся наукой, техникой и исследованиями».

https://habr.com/ru/companies/cloud4y/articles/1029094/

#RESISTORS #история_компьютеров #Тед_Нельсон #гипертекст #PDP8 #Burroughs_Datatron_205 #Клод_Каган #Project_Xanadu #Computer_Lib #история_программирования

#resistance is everything. Also #resistors.

Quieting Noisy Resistors

https://fed.brid.gy/r/https://hackaday.com/2026/02/21/quieting-noisy-resistors/

@susankayequinn

...these are the people that give me hope.
Wonderful story.

https://www.closertotheedge.net/p/the-dildo-distribution-delegation

#ICE #Dildos
#fascist #Nazi
#Resistors
#Minneapolis

@susankayequinn

...these are the people that give me hope.
Wonderful story.

https://www.closertotheedge.net/p/the-dildo-distribution-delegation

#ICE #Dildos
#fascist #Nazi
#Resistors
#Minneapolis

@susankayequinn

...these are the people that give me hope.
Wonderful story.

https://www.closertotheedge.net/p/the-dildo-distribution-delegation

#ICE #Dildos
#fascist #Nazi
#Resistors
#Minneapolis

@susankayequinn

...these are the people that give me hope.
Wonderful story.

https://www.closertotheedge.net/p/the-dildo-distribution-delegation

#ICE #Dildos
#fascist #Nazi
#Resistors
#Minneapolis

@susankayequinn

...these are the people that give me hope.
Wonderful story.

https://www.closertotheedge.net/p/the-dildo-distribution-delegation

#ICE #Dildos
#fascist #Nazi
#Resistors
#Minneapolis

LERs (light-emitting resistors)

https://piefed.zip/c/NiceMemes/p/856766/lers-light-emitting-resistors

LERs (light-emitting resistors)

https://piefed.zip/c/NiceMemes/p/856766/lers-light-emitting-resistors

LERs (light-emitting resistors)

https://piefed.zip/c/NiceMemes/p/856766/lers-light-emitting-resistors

LERs (light-emitting resistors)

https://piefed.zip/c/NiceMemes/p/856766/lers-light-emitting-resistors

LERs (light-emitting resistors)

https://piefed.zip/c/NiceMemes/p/856766/lers-light-emitting-resistors

"[A] small cohort of teenage computer enthusiasts from the Princeton, N.J., area flaunted a clever work-around: They borrowed an acoustic coupler—a forerunner of the computer modem—and connected it to a nearby pay phone. With this hardware in place, the youngsters dialed in to an off-site minicomputer.

The teenagers called themselves the RESISTORS, a retronym (they picked the moniker first and then matched words to the letters) for “Radically Emphatic Students Interested in Science, Technology, Or Research Studies.” The trade publication Computerworld gave the RESISTORS front-page billing—“Students Steal Show as Conference Opens”—and noted how the group drew a “fascinated crowd” of computer professionals. A reporter even suggested that the RESISTORS represented the vanguard of a small-scale social movement as the teens sought to engage with their counterparts from “underprivileged areas of Trenton” and introduce them to personal computing.

In the modern history of computing, a story about a small cohort of teens “playing” with computers might seem tangential. But the previously untold history of the RESISTORS highlights the fact that, years before there were machines called personal computers, some people regularly accessed computers for activities unrelated to their professional lives. Motives varied, but entertainment as well as the display of technical prowess mattered. Just as important, the story of the RESISTORS expands our sense of the hobbyist community beyond later and better-known groups like the Bay Area’s Homebrew Computer Club."

https://spectrum.ieee.org/teenage-hackers

#Computers #ComputerHistory #Hacking #NewJersey #Princeton #Resistors

I can safely say that it's been a while since #DigiKey sold #resistors in pre-packed bags of 5 with included card labels. As their own brand. Made in Taiwan.

Or called themselves "Digi-Key Corporation".

More seriously, I found a bag of #components left over from my senior year of school, when we did our big final project. Mine was a computer-controlled slot machine. Components were seriously expensive then; I organized a group buy with 4 or 5 of my classmates through "Digi-Key", partly because they were cheaper than the local suppliers (see previous story about the "Two Weeks Ten Bucks" guys), but also because we could get quantity price breaks on stuff that was common between our #projects, like the 1 kΩ resistors. IIRC, the resistors cost about $0.30 each in the 5-packs, but the bag of 200 was *way* cheaper - about half that, I think.

These were ordered in 1997, so almost 30 years ago. In addition to #vintage resistors, I found ZTX549 PNP #transistors (still in stock at DigiKey today!), MJE2955T #PNP transistors (also still in stock!), 3 different brands of 741 #opamps, including made-in-Japan and made-in-Malaysia #NEC, TI ones from Taiwan and the Philippines, as well as #TI TL081CP and LM318P from Taiwan. Also a bunch of 74-series logic #chips and some weirder stuff, like a #Motorola MC14412, which is essentially a 0-600 bps (~baud) modem-in-a-chip.

So if you need some vintage components, hit me up 😉

#TexasInstruments #electronics #SupplyHouse #FoundAtHome

I can safely say that it's been a while since #DigiKey sold #resistors in pre-packed bags of 5 with included card labels. As their own brand. Made in Taiwan.

Or called themselves "Digi-Key Corporation".

More seriously, I found a bag of #components left over from my senior year of school, when we did our big final project. Mine was a computer-controlled slot machine. Components were seriously expensive then; I organized a group buy with 4 or 5 of my classmates through "Digi-Key", partly because they were cheaper than the local suppliers (see previous story about the "Two Weeks Ten Bucks" guys), but also because we could get quantity price breaks on stuff that was common between our #projects, like the 1 kΩ resistors. IIRC, the resistors cost about $0.30 each in the 5-packs, but the bag of 200 was *way* cheaper - about half that, I think.

These were ordered in 1997, so almost 30 years ago. In addition to #vintage resistors, I found ZTX549 PNP #transistors (still in stock at DigiKey today!), MJE2955T #PNP transistors (also still in stock!), 3 different brands of 741 #opamps, including made-in-Japan and made-in-Malaysia #NEC, TI ones from Taiwan and the Philippines, as well as #TI TL081CP and LM318P from Taiwan. Also a bunch of 74-series logic #chips and some weirder stuff, like a #Motorola MC14412, which is essentially a 0-600 bps (~baud) modem-in-a-chip.

So if you need some vintage components, hit me up 😉

#TexasInstruments #electronics #SupplyHouse #FoundAtHome

I can safely say that it's been a while since #DigiKey sold #resistors in pre-packed bags of 5 with included card labels. As their own brand. Made in Taiwan.

Or called themselves "Digi-Key Corporation".

More seriously, I found a bag of #components left over from my senior year of school, when we did our big final project. Mine was a computer-controlled slot machine. Components were seriously expensive then; I organized a group buy with 4 or 5 of my classmates through "Digi-Key", partly because they were cheaper than the local suppliers (see previous story about the "Two Weeks Ten Bucks" guys), but also because we could get quantity price breaks on stuff that was common between our #projects, like the 1 kΩ resistors. IIRC, the resistors cost about $0.30 each in the 5-packs, but the bag of 200 was *way* cheaper - about half that, I think.

These were ordered in 1997, so almost 30 years ago. In addition to #vintage resistors, I found ZTX549 PNP #transistors (still in stock at DigiKey today!), MJE2955T #PNP transistors (also still in stock!), 3 different brands of 741 #opamps, including made-in-Japan and made-in-Malaysia #NEC, TI ones from Taiwan and the Philippines, as well as #TI TL081CP and LM318P from Taiwan. Also a bunch of 74-series logic #chips and some weirder stuff, like a #Motorola MC14412, which is essentially a 0-600 bps (~baud) modem-in-a-chip.

So if you need some vintage components, hit me up 😉

#TexasInstruments #electronics #SupplyHouse #FoundAtHome

I can safely say that it's been a while since #DigiKey sold #resistors in pre-packed bags of 5 with included card labels. As their own brand. Made in Taiwan.

Or called themselves "Digi-Key Corporation".

More seriously, I found a bag of #components left over from my senior year of school, when we did our big final project. Mine was a computer-controlled slot machine. Components were seriously expensive then; I organized a group buy with 4 or 5 of my classmates through "Digi-Key", partly because they were cheaper than the local suppliers (see previous story about the "Two Weeks Ten Bucks" guys), but also because we could get quantity price breaks on stuff that was common between our #projects, like the 1 kΩ resistors. IIRC, the resistors cost about $0.30 each in the 5-packs, but the bag of 200 was *way* cheaper - about half that, I think.

These were ordered in 1997, so almost 30 years ago. In addition to #vintage resistors, I found ZTX549 PNP #transistors (still in stock at DigiKey today!), MJE2955T #PNP transistors (also still in stock!), 3 different brands of 741 #opamps, including made-in-Japan and made-in-Malaysia #NEC, TI ones from Taiwan and the Philippines, as well as #TI TL081CP and LM318P from Taiwan. Also a bunch of 74-series logic #chips and some weirder stuff, like a #Motorola MC14412, which is essentially a 0-600 bps (~baud) modem-in-a-chip.

So if you need some vintage components, hit me up 😉

#TexasInstruments #electronics #SupplyHouse #FoundAtHome

I can safely say that it's been a while since #DigiKey sold #resistors in pre-packed bags of 5 with included card labels. As their own brand. Made in Taiwan.

Or called themselves "Digi-Key Corporation".

More seriously, I found a bag of #components left over from my senior year of school, when we did our big final project. Mine was a computer-controlled slot machine. Components were seriously expensive then; I organized a group buy with 4 or 5 of my classmates through "Digi-Key", partly because they were cheaper than the local suppliers (see previous story about the "Two Weeks Ten Bucks" guys), but also because we could get quantity price breaks on stuff that was common between our #projects, like the 1 kΩ resistors. IIRC, the resistors cost about $0.30 each in the 5-packs, but the bag of 200 was *way* cheaper - about half that, I think.

These were ordered in 1997, so almost 30 years ago. In addition to #vintage resistors, I found ZTX549 PNP #transistors (still in stock at DigiKey today!), MJE2955T #PNP transistors (also still in stock!), 3 different brands of 741 #opamps, including made-in-Japan and made-in-Malaysia #NEC, TI ones from Taiwan and the Philippines, as well as #TI TL081CP and LM318P from Taiwan. Also a bunch of 74-series logic #chips and some weirder stuff, like a #Motorola MC14412, which is essentially a 0-600 bps (~baud) modem-in-a-chip.

So if you need some vintage components, hit me up 😉

#TexasInstruments #electronics #SupplyHouse #FoundAtHome

Saw this on another social media but my gosh, so true I had to share. From my favorite Discworld book Guards! Guards! #Discworld #Pratchett #TerryPratchett #Resistors
“They avoided one another's faces, for fear of what they might see mirrored there. Each man thought: one of the others is bound to say something soon, some protest, and then I'll murmur agreement, not actually say anything, I'm not stupid as that, but definitely murmur very firmly, so that the others will be in no doubt that I thoroughly disapprove, because at a time like this it behooves all decent men to nearly stand
up and be almost heard... No one said anything. The cowards, thought each man”

I'm looking for #opinions from #electronics #hobbyists or professionals.

When I'm using a #solderless #breadboard to prototype circuits, resistors can be frustrating. If you just keep re-using the same well-worn ones that look like a pretzel, you have to leave the leads long for the unknown next place you want to use them, and you can accidentally short something else against the leads.

Over the years I've frequently thought "Someone must make #jumper wires with inline resistors so they're easy to reuse", but I've never seen them for sale. [1]

So I made a bunch. And wow, it's labour-intensive to make them well. That explains why no-one's selling them.

Would other people be interested in buying and using these? Anyone can make them, but a lot of people would rather use their limited #hobby time to make their projects, not make things they need to make their #projects.

I've reduced the amount of time to make them and will keep trying, but I would have to charge at least US $30 for a pack of ten. There are ways to reduce it further, but they require a significant investment in equipment, so I'd have to be selling quite a few.

I make them with good materials - silicone 26AWG #wire for flexibility, name-brand 1% metal film #resistors, total length 24cm.

Would anyone want these?

[1] Closest thing I've found is https://www.dfrobot.com/product-1438.html but they're rigid so you need to use an additional wire anyway if you're not connecting exactly that distance through clear space.

#DIY

The Algebra of an Infinite Grid of Resistors

https://www.mathpages.com/home/kmath669/kmath669.htm

#HackerNews #Algebra #InfiniteGrid #Resistors #MathConcepts #EngineeringPhysics

The Algebra of an Infinite Grid of Resistors

https://www.mathpages.com/home/kmath669/kmath669.htm

#HackerNews #Algebra #InfiniteGrid #Resistors #MathConcepts #EngineeringPhysics

The Algebra of an Infinite Grid of Resistors

https://www.mathpages.com/home/kmath669/kmath669.htm

#HackerNews #Algebra #InfiniteGrid #Resistors #MathConcepts #EngineeringPhysics

The Algebra of an Infinite Grid of Resistors

https://www.mathpages.com/home/kmath669/kmath669.htm

#HackerNews #Algebra #InfiniteGrid #Resistors #MathConcepts #EngineeringPhysics

The Algebra of an Infinite Grid of Resistors

https://www.mathpages.com/home/kmath669/kmath669.htm

#HackerNews #Algebra #InfiniteGrid #Resistors #MathConcepts #EngineeringPhysics

🔌💥 "Infinite Grid of Resistors" — An electrifying journey where the only resistance you'll find is from ModSecurity's ironclad error messages. Apparently, the real challenge isn't in the physics, but in finding the elusive resource on the server. 🤦‍♂️🔍
https://www.mathpages.com/home/kmath668/kmath668.htm #InfiniteGrid #Resistors #ModSecurity #ServerChallenge #TechJourney #ErrorMessages #HackerNews #ngated

Infinite Grid of Resistors

https://www.mathpages.com/home/kmath668/kmath668.htm

#HackerNews #Infinite #Grid #of #Resistors #math #physics #engineering #circuits

#Music #Aussie #Australia #Canada #USA #Uspol @50501movement.bsky.social #NeverTrumpers @meidastouch.com #Resistors

RE: https://bsky.app/profile/did:plc:q5qu5sjtn44e7mpyri2qyugv/post/3ln7mhhd3sc2v

#USA #USpol #NeverTrumpers #Resistors

RE: https://bsky.app/profile/did:plc:nzovwoqkivbgdxndzguwwgcb/post/3lmt6gliqk22e

Play this song loud and make it your resistance song America. #USA #USPol #America #Resistors #NeverTrumpers

RE: https://bsky.app/profile/did:plc:q5qu5sjtn44e7mpyri2qyugv/post/3lmt2mwii4c2h

Trump’s #NonResponse to Asheville’s struggles is disgraceful. His #TrumpTariffs are driving up costs while gutting vital agencies that help rebuild communities. The #HandsOff protests are a wake-up call— Americans deserve better than this! #HandsOffProtests #TrumpFailedUs #NorthCarolina #resistors

Trump’s #NonResponse to Asheville’s struggles is disgraceful. His #TrumpTariffs are driving up costs while gutting vital agencies that help rebuild communities. The #HandsOff protests are a wake-up call— Americans deserve better than this! #HandsOffProtests #TrumpFailedUs #NorthCarolina #resistors

Trump’s #NonResponse to Asheville’s struggles is disgraceful. His #TrumpTariffs are driving up costs while gutting vital agencies that help rebuild communities. The #HandsOff protests are a wake-up call— Americans deserve better than this! #HandsOffProtests #TrumpFailedUs #NorthCarolina #resistors

Trump’s #NonResponse to Asheville’s struggles is disgraceful. His #TrumpTariffs are driving up costs while gutting vital agencies that help rebuild communities. The #HandsOff protests are a wake-up call— Americans deserve better than this! #HandsOffProtests #TrumpFailedUs #NorthCarolina #resistors

Trump’s #NonResponse to Asheville’s struggles is disgraceful. His #TrumpTariffs are driving up costs while gutting vital agencies that help rebuild communities. The #HandsOff protests are a wake-up call— Americans deserve better than this! #HandsOffProtests #TrumpFailedUs #NorthCarolina #resistors

#NAFO #Ukraine #Canada #USA #resistors #NeverTrumpers Unite Fight back against Dictators and wannabe Dictators. Be inspired by thus great Aussie song

RE: https://bsky.app/profile/did:plc:q5qu5sjtn44e7mpyri2qyugv/post/3llsium4hb22s

Thanks for joining everyone “🚨 #TrumpWatch Daily Blitz (4-6 PM ET): The latest updates on #Trump and his inner circle! From legal battles to policy moves, we’re tracking every major development in the #MAGA administration. Stay informed with our 24-hour news cycle breakdown! 🔥 #TrumpNews #resistors

Basic Electronics for the Amateur Radio Operator: What You Need to Know for Your Technician License

1,003 words, 5 minutes read time.

If you’re preparing for the Amateur Radio Technician License Exam, understanding basic electronics is a must. While you don’t need to be an electrical engineer, the exam includes fundamental concepts like Ohm’s Law, circuits, components, and RF safety. This guide will walk you through the essential topics, ensuring you’re ready for the test and your first steps as a ham radio operator.

Understanding Electricity: The Basics for Amateur Radio

Electricity is the movement of electrons through a conductor, like a wire. Three key electrical properties define how electricity behaves:

• Voltage (V) is the force that pushes electrons through a circuit. It’s measured in volts (V).
• Current (I) is the flow of electrons, measured in amperes (A).
• Resistance (R) opposes the flow of electricity and is measured in ohms (Ω).

These three are tied together by Ohm’s Law, a fundamental equation in electronics:

V=I×R

This means if you know any two values, you can calculate the third. Understanding this equation is critical for both the exam and real-world troubleshooting.

Direct Current (DC) vs. Alternating Current (AC)

Electricity comes in two forms:

• Direct Current (DC) flows in one direction. Batteries and solar panels produce DC.
• Alternating Current (AC) changes direction many times per second. Household electricity is AC because it’s more efficient for transmission over long distances.

For amateur radio, most equipment runs on DC power, but you’ll also need to understand AC because radio signals are alternating currents that oscillate at high frequencies.

Essential Electronic Components and Their Functions

Several key electronic components appear on the Technician Exam. Here’s what they do:

• Resistors limit current flow.
• Capacitors store and release energy, often used in filtering circuits.
• Inductors store energy in magnetic fields and are important in tuning circuits.
• Diodes allow current to flow in only one direction, useful in rectifier circuits that convert AC to DC.
• Transistors act as switches and amplifiers in radio circuits.

Understanding these basics helps you answer questions about circuit behavior and troubleshooting.

Series and Parallel Circuits

Circuits are made up of components arranged in either series or parallel:

• In a series circuit, current flows through all components one after another. The same current passes through each, but the voltage is divided.
• In a parallel circuit, components share the same voltage, but the current divides among them.

For the exam, you should know how voltage, current, and resistance behave in each type of circuit. For example, total resistance in a series circuit is the sum of all resistances, while in parallel circuits, total resistance is lower than the smallest individual resistor.

Basic AC Concepts and Frequency

Radio waves are AC signals that oscillate at different frequencies. Frequency (f) is measured in hertz (Hz) and tells us how many times per second the wave changes direction. One kilohertz (kHz) is 1,000 Hz, and one megahertz (MHz) is 1,000,000 Hz.

Ham radios operate in different frequency bands, such as:

• VHF (Very High Frequency): 30 MHz – 300 MHz (e.g., 2-meter band)
• UHF (Ultra High Frequency): 300 MHz – 3 GHz (e.g., 70-centimeter band)

Higher frequencies allow for shorter antennas and are good for local communication, while lower frequencies travel further.

Modulation: How We Send Information Over Radio Waves

Modulation is how a radio wave (carrier wave) carries information. The Technician Exam covers three main types:

• Amplitude Modulation (AM): The signal strength (amplitude) changes with the voice signal.
• Frequency Modulation (FM): The frequency of the wave changes to encode information. FM is more resistant to noise and is commonly used in VHF and UHF bands.
• Single Sideband (SSB): A variation of AM that uses less bandwidth and is more efficient for long-distance communication.

Knowing these helps when selecting modes for different types of contacts.

Power, Batteries, and Safety

Most ham radios run on 12V DC power sources, such as batteries or regulated power supplies. It’s important to understand:

• Battery safety: Overcharging or short-circuiting batteries (especially lithium-ion) can be dangerous.
• Fuse protection: Many radios have built-in fuses to prevent excessive current draw.

Another key topic on the test is RF exposure safety. High-power transmissions can generate strong radio frequency (RF) radiation, which may cause health risks. To minimize exposure:

• Maintain a safe distance from transmitting antennas.
• Use the lowest power necessary for effective communication.
• Follow FCC RF exposure limits for your frequency and power level.

Ohm’s Law in Real-World Ham Radio Applications

A common exam question might involve calculating current or voltage using Ohm’s Law. For example:

Question: If a radio operates at 12V and draws 2A of current, what is the resistance?

Using Ohm’s Law:

Understanding these calculations can help with troubleshooting and designing circuits.

Final Thoughts: Studying for the Exam and Beyond

The Technician License Exam covers these topics, but learning electronics doesn’t stop there. Once licensed, you’ll continue exploring concepts like antenna design, signal propagation, and digital communication.

Great resources for studying include:

• ARRL’s Technician Class License Manual: The official guide with explanations and practice questions.
• HamStudy.org: Free practice tests and flashcards.
• QRZ.com Practice Exams: Simulated tests with real exam questions.

By mastering these basic electronics concepts, you’ll be well on your way to passing the exam and starting your journey in amateur radio. Keep practicing, get hands-on experience, and soon, you’ll be making contacts on the air!

D. Bryan King

Sources

• American Radio Relay League (ARRL) – Official Site
• FCC Amateur Radio Service – Licensing and Regulations
• QRZ.com – Amateur Radio Callsign Database
• HamStudy.org – Exam Prep and Study Tools
• Electronics Tutorials – Basic Circuit Theory
• RadioReference.com – Frequency Database and Scanner Information
• AMSAT – Amateur Radio Satellites and Space Communications
• DX Engineering – Ham Radio Equipment and Resources
• MikroE Learn – Electronics and Circuit Design Tutorials
• Radio Society of Great Britain (RSGB) – Ham Radio Resources
• Arduino – Microcontrollers and DIY Electronics for Ham Radio
• eHam.net – Amateur Radio News, Reviews, and Forums

Disclaimer:

The views and opinions expressed in this post are solely those of the author. The information provided is based on personal research, experience, and understanding of the subject matter at the time of writing. Readers should consult relevant experts or authorities for specific guidance related to their unique situations.

Related Posts

Rate this:

#ACVsDC #am #AmateurRadio #amateurRadioEducation #amateurRadioTraining #antennaTheory #ARRLStudyGuide #basicElectronics #beginnerHamRadio #capacitors #circuits #current #diodes #electricalComponents #electronicsBasics #examPrep #FCCExam #FM #hamExam #hamLicense #hamOperator #hamRadio #hamRadioBands #hamRadioBeginner #hamRadioComponents #hamRadioEquipment #hamRadioOperator #hamRadioStudy #HamRadioStudyGuide #HamRadioTraining #hamStudyGuide #inductors #modulation #OhmSLaw #powerSupply #radioBroadcasting #radioCommunication #radioFrequencies #radioFrequency #radioFundamentals #RadioLicensing #radioSignals #RadioTechnology #radioTransmission #radioWaves #resistance #resistors #RFExposure #RFSafety #SSB #technicianClass #TechnicianLicense #transistors #UHF #VHF #voltage

Basic Electronics for the Amateur Radio Operator: What You Need to Know for Your Technician License

1,003 words, 5 minutes read time.

If you’re preparing for the Amateur Radio Technician License Exam, understanding basic electronics is a must. While you don’t need to be an electrical engineer, the exam includes fundamental concepts like Ohm’s Law, circuits, components, and RF safety. This guide will walk you through the essential topics, ensuring you’re ready for the test and your first steps as a ham radio operator.

Understanding Electricity: The Basics for Amateur Radio

Electricity is the movement of electrons through a conductor, like a wire. Three key electrical properties define how electricity behaves:

• Voltage (V) is the force that pushes electrons through a circuit. It’s measured in volts (V).
• Current (I) is the flow of electrons, measured in amperes (A).
• Resistance (R) opposes the flow of electricity and is measured in ohms (Ω).

These three are tied together by Ohm’s Law, a fundamental equation in electronics:

V=I×R

This means if you know any two values, you can calculate the third. Understanding this equation is critical for both the exam and real-world troubleshooting.

Direct Current (DC) vs. Alternating Current (AC)

Electricity comes in two forms:

• Direct Current (DC) flows in one direction. Batteries and solar panels produce DC.
• Alternating Current (AC) changes direction many times per second. Household electricity is AC because it’s more efficient for transmission over long distances.

For amateur radio, most equipment runs on DC power, but you’ll also need to understand AC because radio signals are alternating currents that oscillate at high frequencies.

Essential Electronic Components and Their Functions

Several key electronic components appear on the Technician Exam. Here’s what they do:

• Resistors limit current flow.
• Capacitors store and release energy, often used in filtering circuits.
• Inductors store energy in magnetic fields and are important in tuning circuits.
• Diodes allow current to flow in only one direction, useful in rectifier circuits that convert AC to DC.
• Transistors act as switches and amplifiers in radio circuits.

Understanding these basics helps you answer questions about circuit behavior and troubleshooting.

Series and Parallel Circuits

Circuits are made up of components arranged in either series or parallel:

• In a series circuit, current flows through all components one after another. The same current passes through each, but the voltage is divided.
• In a parallel circuit, components share the same voltage, but the current divides among them.

For the exam, you should know how voltage, current, and resistance behave in each type of circuit. For example, total resistance in a series circuit is the sum of all resistances, while in parallel circuits, total resistance is lower than the smallest individual resistor.

Basic AC Concepts and Frequency

Radio waves are AC signals that oscillate at different frequencies. Frequency (f) is measured in hertz (Hz) and tells us how many times per second the wave changes direction. One kilohertz (kHz) is 1,000 Hz, and one megahertz (MHz) is 1,000,000 Hz.

Ham radios operate in different frequency bands, such as:

• VHF (Very High Frequency): 30 MHz – 300 MHz (e.g., 2-meter band)
• UHF (Ultra High Frequency): 300 MHz – 3 GHz (e.g., 70-centimeter band)

Higher frequencies allow for shorter antennas and are good for local communication, while lower frequencies travel further.

Modulation: How We Send Information Over Radio Waves

Modulation is how a radio wave (carrier wave) carries information. The Technician Exam covers three main types:

• Amplitude Modulation (AM): The signal strength (amplitude) changes with the voice signal.
• Frequency Modulation (FM): The frequency of the wave changes to encode information. FM is more resistant to noise and is commonly used in VHF and UHF bands.
• Single Sideband (SSB): A variation of AM that uses less bandwidth and is more efficient for long-distance communication.

Knowing these helps when selecting modes for different types of contacts.

Power, Batteries, and Safety

Most ham radios run on 12V DC power sources, such as batteries or regulated power supplies. It’s important to understand:

• Battery safety: Overcharging or short-circuiting batteries (especially lithium-ion) can be dangerous.
• Fuse protection: Many radios have built-in fuses to prevent excessive current draw.

Another key topic on the test is RF exposure safety. High-power transmissions can generate strong radio frequency (RF) radiation, which may cause health risks. To minimize exposure:

• Maintain a safe distance from transmitting antennas.
• Use the lowest power necessary for effective communication.
• Follow FCC RF exposure limits for your frequency and power level.

Ohm’s Law in Real-World Ham Radio Applications

A common exam question might involve calculating current or voltage using Ohm’s Law. For example:

Question: If a radio operates at 12V and draws 2A of current, what is the resistance?

Using Ohm’s Law:

Understanding these calculations can help with troubleshooting and designing circuits.

Final Thoughts: Studying for the Exam and Beyond

The Technician License Exam covers these topics, but learning electronics doesn’t stop there. Once licensed, you’ll continue exploring concepts like antenna design, signal propagation, and digital communication.

Great resources for studying include:

• ARRL’s Technician Class License Manual: The official guide with explanations and practice questions.
• HamStudy.org: Free practice tests and flashcards.
• QRZ.com Practice Exams: Simulated tests with real exam questions.

By mastering these basic electronics concepts, you’ll be well on your way to passing the exam and starting your journey in amateur radio. Keep practicing, get hands-on experience, and soon, you’ll be making contacts on the air!

D. Bryan King

Sources

• American Radio Relay League (ARRL) – Official Site
• FCC Amateur Radio Service – Licensing and Regulations
• QRZ.com – Amateur Radio Callsign Database
• HamStudy.org – Exam Prep and Study Tools
• Electronics Tutorials – Basic Circuit Theory
• RadioReference.com – Frequency Database and Scanner Information
• AMSAT – Amateur Radio Satellites and Space Communications
• DX Engineering – Ham Radio Equipment and Resources
• MikroE Learn – Electronics and Circuit Design Tutorials
• Radio Society of Great Britain (RSGB) – Ham Radio Resources
• Arduino – Microcontrollers and DIY Electronics for Ham Radio
• eHam.net – Amateur Radio News, Reviews, and Forums

Disclaimer:

The views and opinions expressed in this post are solely those of the author. The information provided is based on personal research, experience, and understanding of the subject matter at the time of writing. Readers should consult relevant experts or authorities for specific guidance related to their unique situations.

Related Posts

Rate this:

#ACVsDC #am #AmateurRadio #amateurRadioEducation #amateurRadioTraining #antennaTheory #ARRLStudyGuide #basicElectronics #beginnerHamRadio #capacitors #circuits #current #diodes #electricalComponents #electronicsBasics #examPrep #FCCExam #FM #hamExam #hamLicense #hamOperator #hamRadio #hamRadioBands #hamRadioBeginner #hamRadioComponents #hamRadioEquipment #hamRadioOperator #hamRadioStudy #HamRadioStudyGuide #HamRadioTraining #hamStudyGuide #inductors #modulation #OhmSLaw #powerSupply #radioBroadcasting #radioCommunication #radioFrequencies #radioFrequency #radioFundamentals #RadioLicensing #radioSignals #RadioTechnology #radioTransmission #radioWaves #resistance #resistors #RFExposure #RFSafety #SSB #technicianClass #TechnicianLicense #transistors #UHF #VHF #voltage

Basic Electronics for the Amateur Radio Operator: What You Need to Know for Your Technician License

1,003 words, 5 minutes read time.

If you’re preparing for the Amateur Radio Technician License Exam, understanding basic electronics is a must. While you don’t need to be an electrical engineer, the exam includes fundamental concepts like Ohm’s Law, circuits, components, and RF safety. This guide will walk you through the essential topics, ensuring you’re ready for the test and your first steps as a ham radio operator.

Understanding Electricity: The Basics for Amateur Radio

Electricity is the movement of electrons through a conductor, like a wire. Three key electrical properties define how electricity behaves:

• Voltage (V) is the force that pushes electrons through a circuit. It’s measured in volts (V).
• Current (I) is the flow of electrons, measured in amperes (A).
• Resistance (R) opposes the flow of electricity and is measured in ohms (Ω).

These three are tied together by Ohm’s Law, a fundamental equation in electronics:

V=I×R

This means if you know any two values, you can calculate the third. Understanding this equation is critical for both the exam and real-world troubleshooting.

Direct Current (DC) vs. Alternating Current (AC)

Electricity comes in two forms:

• Direct Current (DC) flows in one direction. Batteries and solar panels produce DC.
• Alternating Current (AC) changes direction many times per second. Household electricity is AC because it’s more efficient for transmission over long distances.

For amateur radio, most equipment runs on DC power, but you’ll also need to understand AC because radio signals are alternating currents that oscillate at high frequencies.

Essential Electronic Components and Their Functions

Several key electronic components appear on the Technician Exam. Here’s what they do:

• Resistors limit current flow.
• Capacitors store and release energy, often used in filtering circuits.
• Inductors store energy in magnetic fields and are important in tuning circuits.
• Diodes allow current to flow in only one direction, useful in rectifier circuits that convert AC to DC.
• Transistors act as switches and amplifiers in radio circuits.

Understanding these basics helps you answer questions about circuit behavior and troubleshooting.

Series and Parallel Circuits

Circuits are made up of components arranged in either series or parallel:

• In a series circuit, current flows through all components one after another. The same current passes through each, but the voltage is divided.
• In a parallel circuit, components share the same voltage, but the current divides among them.

For the exam, you should know how voltage, current, and resistance behave in each type of circuit. For example, total resistance in a series circuit is the sum of all resistances, while in parallel circuits, total resistance is lower than the smallest individual resistor.

Basic AC Concepts and Frequency

Radio waves are AC signals that oscillate at different frequencies. Frequency (f) is measured in hertz (Hz) and tells us how many times per second the wave changes direction. One kilohertz (kHz) is 1,000 Hz, and one megahertz (MHz) is 1,000,000 Hz.

Ham radios operate in different frequency bands, such as:

• VHF (Very High Frequency): 30 MHz – 300 MHz (e.g., 2-meter band)
• UHF (Ultra High Frequency): 300 MHz – 3 GHz (e.g., 70-centimeter band)

Higher frequencies allow for shorter antennas and are good for local communication, while lower frequencies travel further.

Modulation: How We Send Information Over Radio Waves

Modulation is how a radio wave (carrier wave) carries information. The Technician Exam covers three main types:

• Amplitude Modulation (AM): The signal strength (amplitude) changes with the voice signal.
• Frequency Modulation (FM): The frequency of the wave changes to encode information. FM is more resistant to noise and is commonly used in VHF and UHF bands.
• Single Sideband (SSB): A variation of AM that uses less bandwidth and is more efficient for long-distance communication.

Knowing these helps when selecting modes for different types of contacts.

Power, Batteries, and Safety

Most ham radios run on 12V DC power sources, such as batteries or regulated power supplies. It’s important to understand:

• Battery safety: Overcharging or short-circuiting batteries (especially lithium-ion) can be dangerous.
• Fuse protection: Many radios have built-in fuses to prevent excessive current draw.

Another key topic on the test is RF exposure safety. High-power transmissions can generate strong radio frequency (RF) radiation, which may cause health risks. To minimize exposure:

• Maintain a safe distance from transmitting antennas.
• Use the lowest power necessary for effective communication.
• Follow FCC RF exposure limits for your frequency and power level.

Ohm’s Law in Real-World Ham Radio Applications

A common exam question might involve calculating current or voltage using Ohm’s Law. For example:

Question: If a radio operates at 12V and draws 2A of current, what is the resistance?

Using Ohm’s Law:

Understanding these calculations can help with troubleshooting and designing circuits.

Final Thoughts: Studying for the Exam and Beyond

The Technician License Exam covers these topics, but learning electronics doesn’t stop there. Once licensed, you’ll continue exploring concepts like antenna design, signal propagation, and digital communication.

Great resources for studying include:

• ARRL’s Technician Class License Manual: The official guide with explanations and practice questions.
• HamStudy.org: Free practice tests and flashcards.
• QRZ.com Practice Exams: Simulated tests with real exam questions.

By mastering these basic electronics concepts, you’ll be well on your way to passing the exam and starting your journey in amateur radio. Keep practicing, get hands-on experience, and soon, you’ll be making contacts on the air!

D. Bryan King

Sources

• American Radio Relay League (ARRL) – Official Site
• FCC Amateur Radio Service – Licensing and Regulations
• QRZ.com – Amateur Radio Callsign Database
• HamStudy.org – Exam Prep and Study Tools
• Electronics Tutorials – Basic Circuit Theory
• RadioReference.com – Frequency Database and Scanner Information
• AMSAT – Amateur Radio Satellites and Space Communications
• DX Engineering – Ham Radio Equipment and Resources
• MikroE Learn – Electronics and Circuit Design Tutorials
• Radio Society of Great Britain (RSGB) – Ham Radio Resources
• Arduino – Microcontrollers and DIY Electronics for Ham Radio
• eHam.net – Amateur Radio News, Reviews, and Forums

Disclaimer:

The views and opinions expressed in this post are solely those of the author. The information provided is based on personal research, experience, and understanding of the subject matter at the time of writing. Readers should consult relevant experts or authorities for specific guidance related to their unique situations.

Related Posts

Rate this:

#ACVsDC #am #AmateurRadio #amateurRadioEducation #amateurRadioTraining #antennaTheory #ARRLStudyGuide #basicElectronics #beginnerHamRadio #capacitors #circuits #current #diodes #electricalComponents #electronicsBasics #examPrep #FCCExam #FM #hamExam #hamLicense #hamOperator #hamRadio #hamRadioBands #hamRadioBeginner #hamRadioComponents #hamRadioEquipment #hamRadioOperator #hamRadioStudy #HamRadioStudyGuide #HamRadioTraining #hamStudyGuide #inductors #modulation #OhmSLaw #powerSupply #radioBroadcasting #radioCommunication #radioFrequencies #radioFrequency #radioFundamentals #RadioLicensing #radioSignals #RadioTechnology #radioTransmission #radioWaves #resistance #resistors #RFExposure #RFSafety #SSB #technicianClass #TechnicianLicense #transistors #UHF #VHF #voltage

Basic Electronics for the Amateur Radio Operator: What You Need to Know for Your Technician License

1,003 words, 5 minutes read time.

If you’re preparing for the Amateur Radio Technician License Exam, understanding basic electronics is a must. While you don’t need to be an electrical engineer, the exam includes fundamental concepts like Ohm’s Law, circuits, components, and RF safety. This guide will walk you through the essential topics, ensuring you’re ready for the test and your first steps as a ham radio operator.

Understanding Electricity: The Basics for Amateur Radio

Electricity is the movement of electrons through a conductor, like a wire. Three key electrical properties define how electricity behaves:

• Voltage (V) is the force that pushes electrons through a circuit. It’s measured in volts (V).
• Current (I) is the flow of electrons, measured in amperes (A).
• Resistance (R) opposes the flow of electricity and is measured in ohms (Ω).

These three are tied together by Ohm’s Law, a fundamental equation in electronics:

V=I×R

This means if you know any two values, you can calculate the third. Understanding this equation is critical for both the exam and real-world troubleshooting.

Direct Current (DC) vs. Alternating Current (AC)

Electricity comes in two forms:

• Direct Current (DC) flows in one direction. Batteries and solar panels produce DC.
• Alternating Current (AC) changes direction many times per second. Household electricity is AC because it’s more efficient for transmission over long distances.

For amateur radio, most equipment runs on DC power, but you’ll also need to understand AC because radio signals are alternating currents that oscillate at high frequencies.

Essential Electronic Components and Their Functions

Several key electronic components appear on the Technician Exam. Here’s what they do:

• Resistors limit current flow.
• Capacitors store and release energy, often used in filtering circuits.
• Inductors store energy in magnetic fields and are important in tuning circuits.
• Diodes allow current to flow in only one direction, useful in rectifier circuits that convert AC to DC.
• Transistors act as switches and amplifiers in radio circuits.

Understanding these basics helps you answer questions about circuit behavior and troubleshooting.

Series and Parallel Circuits

Circuits are made up of components arranged in either series or parallel:

• In a series circuit, current flows through all components one after another. The same current passes through each, but the voltage is divided.
• In a parallel circuit, components share the same voltage, but the current divides among them.

For the exam, you should know how voltage, current, and resistance behave in each type of circuit. For example, total resistance in a series circuit is the sum of all resistances, while in parallel circuits, total resistance is lower than the smallest individual resistor.

Basic AC Concepts and Frequency

Radio waves are AC signals that oscillate at different frequencies. Frequency (f) is measured in hertz (Hz) and tells us how many times per second the wave changes direction. One kilohertz (kHz) is 1,000 Hz, and one megahertz (MHz) is 1,000,000 Hz.

Ham radios operate in different frequency bands, such as:

• VHF (Very High Frequency): 30 MHz – 300 MHz (e.g., 2-meter band)
• UHF (Ultra High Frequency): 300 MHz – 3 GHz (e.g., 70-centimeter band)

Higher frequencies allow for shorter antennas and are good for local communication, while lower frequencies travel further.

Modulation: How We Send Information Over Radio Waves

Modulation is how a radio wave (carrier wave) carries information. The Technician Exam covers three main types:

• Amplitude Modulation (AM): The signal strength (amplitude) changes with the voice signal.
• Frequency Modulation (FM): The frequency of the wave changes to encode information. FM is more resistant to noise and is commonly used in VHF and UHF bands.
• Single Sideband (SSB): A variation of AM that uses less bandwidth and is more efficient for long-distance communication.

Knowing these helps when selecting modes for different types of contacts.

Power, Batteries, and Safety

Most ham radios run on 12V DC power sources, such as batteries or regulated power supplies. It’s important to understand:

• Battery safety: Overcharging or short-circuiting batteries (especially lithium-ion) can be dangerous.
• Fuse protection: Many radios have built-in fuses to prevent excessive current draw.

Another key topic on the test is RF exposure safety. High-power transmissions can generate strong radio frequency (RF) radiation, which may cause health risks. To minimize exposure:

• Maintain a safe distance from transmitting antennas.
• Use the lowest power necessary for effective communication.
• Follow FCC RF exposure limits for your frequency and power level.

Ohm’s Law in Real-World Ham Radio Applications

A common exam question might involve calculating current or voltage using Ohm’s Law. For example:

Question: If a radio operates at 12V and draws 2A of current, what is the resistance?

Using Ohm’s Law:

Understanding these calculations can help with troubleshooting and designing circuits.

Final Thoughts: Studying for the Exam and Beyond

The Technician License Exam covers these topics, but learning electronics doesn’t stop there. Once licensed, you’ll continue exploring concepts like antenna design, signal propagation, and digital communication.

Great resources for studying include:

• ARRL’s Technician Class License Manual: The official guide with explanations and practice questions.
• HamStudy.org: Free practice tests and flashcards.
• QRZ.com Practice Exams: Simulated tests with real exam questions.

By mastering these basic electronics concepts, you’ll be well on your way to passing the exam and starting your journey in amateur radio. Keep practicing, get hands-on experience, and soon, you’ll be making contacts on the air!

D. Bryan King

Sources

• American Radio Relay League (ARRL) – Official Site
• FCC Amateur Radio Service – Licensing and Regulations
• QRZ.com – Amateur Radio Callsign Database
• HamStudy.org – Exam Prep and Study Tools
• Electronics Tutorials – Basic Circuit Theory
• RadioReference.com – Frequency Database and Scanner Information
• AMSAT – Amateur Radio Satellites and Space Communications
• DX Engineering – Ham Radio Equipment and Resources
• MikroE Learn – Electronics and Circuit Design Tutorials
• Radio Society of Great Britain (RSGB) – Ham Radio Resources
• Arduino – Microcontrollers and DIY Electronics for Ham Radio
• eHam.net – Amateur Radio News, Reviews, and Forums

Disclaimer:

The views and opinions expressed in this post are solely those of the author. The information provided is based on personal research, experience, and understanding of the subject matter at the time of writing. Readers should consult relevant experts or authorities for specific guidance related to their unique situations.

Related Posts

Rate this:

#ACVsDC #am #AmateurRadio #amateurRadioEducation #amateurRadioTraining #antennaTheory #ARRLStudyGuide #basicElectronics #beginnerHamRadio #capacitors #circuits #current #diodes #electricalComponents #electronicsBasics #examPrep #FCCExam #FM #hamExam #hamLicense #hamOperator #hamRadio #hamRadioBands #hamRadioBeginner #hamRadioComponents #hamRadioEquipment #hamRadioOperator #hamRadioStudy #HamRadioStudyGuide #HamRadioTraining #hamStudyGuide #inductors #modulation #OhmSLaw #powerSupply #radioBroadcasting #radioCommunication #radioFrequencies #radioFrequency #radioFundamentals #RadioLicensing #radioSignals #RadioTechnology #radioTransmission #radioWaves #resistance #resistors #RFExposure #RFSafety #SSB #technicianClass #TechnicianLicense #transistors #UHF #VHF #voltage