#ad9833 — Public Fediverse posts

Well, I couldn't leave it alone...

The Arduino code now allows triangle waves, up to 1.0MHz (same as square waves), and sine waves up to 12.5MHz.

Also managed to push my Owon VDS1022i to its limits... the sine wave started to look a bit ropey after 5.0MHz, but not bad until then.

The design, updated code and even more pictures are all shared on GitHub too:

https://github.com/ilneill/DFG-ArdAD9833

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010
#RotaryEncoder
#KY040
#HD44780lcd

Well, I couldn't leave it alone...

The Arduino code now allows triangle waves, up to 1.0MHz (same as square waves), and sine waves up to 12.5MHz.

Also managed to push my Owon VDS1022i to its limits... the sine wave started to look a bit ropey after 5.0MHz, but not bad until then.

The design, updated code and even more pictures are all shared on GitHub too:

https://github.com/ilneill/DFG-ArdAD9833

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010
#RotaryEncoder
#KY040
#HD44780lcd

Well, I couldn't leave it alone...

The Arduino code now allows triangle waves, up to 1.0MHz (same as square waves), and sine waves up to 12.5MHz.

Also managed to push my Owon VDS1022i to its limits... the sine wave started to look a bit ropey after 5.0MHz, but not bad until then.

The design, updated code and even more pictures are all shared on GitHub too:

https://github.com/ilneill/DFG-ArdAD9833

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010
#RotaryEncoder
#KY040
#HD44780lcd

Well, I couldn't leave it alone...

The Arduino code now allows triangle waves, up to 1.0MHz (same as square waves), and sine waves up to 12.5MHz.

Also managed to push my Owon VDS1022i to its limits... the sine wave started to look a bit ropey after 5.0MHz, but not bad until then.

The design, updated code and even more pictures are all shared on GitHub too:

https://github.com/ilneill/DFG-ArdAD9833

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010
#RotaryEncoder
#KY040
#HD44780lcd

Well, I couldn't leave it alone...

The Arduino code now allows triangle waves, up to 1.0MHz (same as square waves), and sine waves up to 12.5MHz.

Also managed to push my Owon VDS1022i to its limits... the sine wave started to look a bit ropey after 5.0MHz, but not bad until then.

The design, updated code and even more pictures are all shared on GitHub too:

https://github.com/ilneill/DFG-ArdAD9833

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010
#RotaryEncoder
#KY040
#HD44780lcd

Hurrah! My latest project, an Arduino/AD9833 based digital frequency generator, is complete... And it works too 🎉

Impressed with rotary encoders and the AD9833 module. Very pleased with my Owon VDS1022i USB oscilloscope performance!

Design drawn, built. Done ✅
Code written, tested. Done ✅

The design, code and more pictures are all shared on GitHub too:

https://github.com/ilneill/DFG-ArdAD9833

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010
#RotaryEncoder
#KY-040
#HD44780lcd

Hurrah! My latest project, an Arduino/AD9833 based digital frequency generator, is complete... And it works too 🎉

Impressed with rotary encoders and the AD9833 module. Very pleased with my Owon VDS1022i USB oscilloscope performance!

Design drawn, built. Done ✅
Code written, tested. Done ✅

The design, code and more pictures are all shared on GitHub too:

https://github.com/ilneill/DFG-ArdAD9833

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010
#RotaryEncoder
#KY-040
#HD44780lcd

Hurrah! My latest project, an Arduino/AD9833 based digital frequency generator, is complete... And it works too 🎉

Impressed with rotary encoders and the AD9833 module. Very pleased with my Owon VDS1022i USB oscilloscope performance!

Design drawn, built. Done ✅
Code written, tested. Done ✅

The design, code and more pictures are all shared on GitHub too:

https://github.com/ilneill/DFG-ArdAD9833

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010
#RotaryEncoder
#KY-040
#HD44780lcd

Hurrah! My latest project, an Arduino/AD9833 based digital frequency generator, is complete... And it works too 🎉

Impressed with rotary encoders and the AD9833 module. Very pleased with my Owon VDS1022i USB oscilloscope performance!

Design drawn, built. Done ✅
Code written, tested. Done ✅

The design, code and more pictures are all shared on GitHub too:

https://github.com/ilneill/DFG-ArdAD9833

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010
#RotaryEncoder
#KY-040
#HD44780lcd

Hurrah! My latest project, an Arduino/AD9833 based digital frequency generator, is complete... And it works too 🎉

Impressed with rotary encoders and the AD9833 module. Very pleased with my Owon VDS1022i USB oscilloscope performance!

Design drawn, built. Done ✅
Code written, tested. Done ✅

The design, code and more pictures are all shared on GitHub too:

https://github.com/ilneill/DFG-ArdAD9833

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010
#RotaryEncoder
#KY-040
#HD44780lcd

Following my previous project... A rather disappointing analogue waveform generator, may I introduce you to my latest project - a digital waveform generator.

Working on the overall design, some Arduino code and a Fritzing drawing to accompany it.

This 3.3v/5v module has an AD9833 frequency generator, an MCP41010 digital potentiometer and an AD8051 opamp.

I really enjoy joining hardware and software to make a system.

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010

Following my previous project... A rather disappointing analogue waveform generator, may I introduce you to my latest project - a digital waveform generator.

Working on the overall design, some Arduino code and a Fritzing drawing to accompany it.

This 3.3v/5v module has an AD9833 frequency generator, an MCP41010 digital potentiometer and an AD8051 opamp.

I really enjoy joining hardware and software to make a system.

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010

Following my previous project... A rather disappointing analogue waveform generator, may I introduce you to my latest project - a digital waveform generator.

Working on the overall design, some Arduino code and a Fritzing drawing to accompany it.

This 3.3v/5v module has an AD9833 frequency generator, an MCP41010 digital potentiometer and an AD8051 opamp.

I really enjoy joining hardware and software to make a system.

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010

Following my previous project... A rather disappointing analogue waveform generator, may I introduce you to my latest project - a digital waveform generator.

Working on the overall design, some Arduino code and a Fritzing drawing to accompany it.

This 3.3v/5v module has an AD9833 frequency generator, an MCP41010 digital potentiometer and an AD8051 opamp.

I really enjoy joining hardware and software to make a system.

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010

Following my previous project... A rather disappointing analogue waveform generator, may I introduce you to my latest project - a digital waveform generator.

Working on the overall design, some Arduino code and a Fritzing drawing to accompany it.

This 3.3v/5v module has an AD9833 frequency generator, an MCP41010 digital potentiometer and an AD8051 opamp.

I really enjoy joining hardware and software to make a system.

#FrequencyGenerator
#Arduino
#ArduinoUno
#ArduinoNano
#AD9833
#MCP41010

Was laying out the #kicad #schematic for #muvco and it started to seem too pedestrian.

Went back and realized I had been using the #pcm5102 wrong and it does indeed do exactly what I originally wanted.

Now making a waveform generator instead of using the dds #ad9833. Much more flexible in shape and can be semi-polysynth ("chordal #synth"?) #synthdiy

Can now generate a perfect 5th in 260us! In mostly-unoptimized #micropython! Just dyads still--need to generalize to larger chords + diff shapes.

Was laying out the #kicad #schematic for #muvco and it started to seem too pedestrian.

Went back and realized I had been using the #pcm5102 wrong and it does indeed do exactly what I originally wanted.

Now making a waveform generator instead of using the dds #ad9833. Much more flexible in shape and can be semi-polysynth ("chordal #synth"?) #synthdiy

Can now generate a perfect 5th in 260us! In mostly-unoptimized #micropython! Just dyads still--need to generalize to larger chords + diff shapes.

Was laying out the #kicad #schematic for #muvco and it started to seem too pedestrian.

Went back and realized I had been using the #pcm5102 wrong and it does indeed do exactly what I originally wanted.

Now making a waveform generator instead of using the dds #ad9833. Much more flexible in shape and can be semi-polysynth ("chordal #synth"?) #synthdiy

Can now generate a perfect 5th in 260us! In mostly-unoptimized #micropython! Just dyads still--need to generalize to larger chords + diff shapes.

Was laying out the #kicad #schematic for #muvco and it started to seem too pedestrian.

Went back and realized I had been using the #pcm5102 wrong and it does indeed do exactly what I originally wanted.

Now making a waveform generator instead of using the dds #ad9833. Much more flexible in shape and can be semi-polysynth ("chordal #synth"?) #synthdiy

Can now generate a perfect 5th in 260us! In mostly-unoptimized #micropython! Just dyads still--need to generalize to larger chords + diff shapes.

Was laying out the #kicad #schematic for #muvco and it started to seem too pedestrian.

Went back and realized I had been using the #pcm5102 wrong and it does indeed do exactly what I originally wanted.

Now making a waveform generator instead of using the dds #ad9833. Much more flexible in shape and can be semi-polysynth ("chordal #synth"?) #synthdiy

Can now generate a perfect 5th in 260us! In mostly-unoptimized #micropython! Just dyads still--need to generalize to larger chords + diff shapes.

@cedargrove Just glancing over how you organized this I finally understand why I've had problems with the #ad9833. I've been thinking of the process as "I give a command and you obey" while it is actually "I put you in a state and you react".

That said, I'm still not sure I can do audio rate FM synthesis unless I came up with a completely different concept for input.

Oh. Among other problems, I just realized this will never work in the setup I have now.

I'm reading the FM input via #micropython. That inner loop is reading at no more than few hundred Hz, so I can't modulate with more than a couple hundred Hz. Just proved this by turning the modulation freq until I heard it aliasing. 350Hz

I'm controlling the #ad9833 via #spi, so there's no good #analog way to do the FM.

I already have the jack and knob wired in, tho. What else can I use it for?

#synthdiy

Aha, no, I see. You can't just add 180 anything in a sinusoid and end up at the same amplitude. Just think of the two peaks as a simple example.

A click-less through-zero would need to start counting the phase accumulator backwards. Which the #ad9833 doesn't do.

I think this needs a low-pass filter with a very, very high cutoff frequency.

#electronics #synthdiy

Ugh, there's a problem with the through-zero linear fm "just flip the phase 180" idea for #muvco.

#AD9833 works with a phase accumulator. Meaning it just counts up in a ramp at a rate given by the freq. Then it adds the phase register.

When I flip to the other phase register, it's a discontinuous jump = an audio pop.

Can't count backwards. Don't know where I am in the phase (I think) so I can't just add 180 to that (the #math way)

Maybe just a low-pass #filter to drop the pop?

#synthdiy

Got the code to control the #ad9833 phase registers written in about 15 minutes.

That was 3 hours ago.

I can flip registers back and forth. But I can't seem to set the value. Or it has no effect. I *always* get a phase shift of ~pi/2 instead of pi, no matter what values I put into the phase registers.

grrrrrr

I threw an FM knob on the #muvco just b/c I thought I oughtta. Getting to that part now, it looks like I'd prefer linear FM with "through-zero"

Conceptually, that's really simple to add purely in software with the #esp32 + #ad9833 b/c it has two phase registers. Init them to 0 and 180 and flip when the frequency sign toggles.

Hopefully takes just an hour or two today. Then I could hook the VCO into existing VCF/VCA #eurorack modules and retry Bach a little more musically.

@julien On the #midi->cv I'm using using the #mcp4728. I plan on making a dedicated midicv #eurorack module maybe as my next project, but I had this available for testing.

On the #VCO itself, it's the #ad9833 which is sort of secondarily a #DAC and primarily a digital synthesis chip.

I'm starting to have a neat idea about maybe a clever software + hardware way of doing polysynth myself pretty simply and cheaply. I have to experiment with it, tho.

@julien On the #midi->cv I'm using using the #mcp4728. I plan on making a dedicated midicv #eurorack module maybe as my next project, but I had this available for testing.

On the #VCO itself, it's the #ad9833 which is sort of secondarily a #DAC and primarily a digital synthesis chip.

I'm starting to have a neat idea about maybe a clever software + hardware way of doing polysynth myself pretty simply and cheaply. I have to experiment with it, tho.

@julien On the #midi->cv I'm using using the #mcp4728. I plan on making a dedicated midicv #eurorack module maybe as my next project, but I had this available for testing.

On the #VCO itself, it's the #ad9833 which is sort of secondarily a #DAC and primarily a digital synthesis chip.

I'm starting to have a neat idea about maybe a clever software + hardware way of doing polysynth myself pretty simply and cheaply. I have to experiment with it, tho.

@julien On the #midi->cv I'm using using the #mcp4728. I plan on making a dedicated midicv #eurorack module maybe as my next project, but I had this available for testing.

On the #VCO itself, it's the #ad9833 which is sort of secondarily a #DAC and primarily a digital synthesis chip.

I'm starting to have a neat idea about maybe a clever software + hardware way of doing polysynth myself pretty simply and cheaply. I have to experiment with it, tho.

@julien On the #midi->cv I'm using using the #mcp4728. I plan on making a dedicated midicv #eurorack module maybe as my next project, but I had this available for testing.

On the #VCO itself, it's the #ad9833 which is sort of secondarily a #DAC and primarily a digital synthesis chip.

I'm starting to have a neat idea about maybe a clever software + hardware way of doing polysynth myself pretty simply and cheaply. I have to experiment with it, tho.

@matt_trentini @dave @fuzzySynths I definitely walked in with a plan to bitbang. Reading about #micropython interrupts disabused me.

I'm not sure what RMT is. I looked at an #I2S device but it kind of sucked. The #ad9833 is #SPI and works beautifully but has predetermined waveforms.

I wondered about storing wfs in an #eeprom but it needs more thought. Still need to output a phase ramp at a high rate. #esp32->DDS ramp->eeprom->DAC?

@dave @fuzzySynths I was thinking about the same thing for getting #midi going. The problem is, I already used the wifi pins for adc, so I need another idea. midi keyboard?

Thanks for "DDS ladder" that fills in some blanks for me. I guess you are creating a DAC from scratch? I'm using the #ad9833 largely because #micropython was too slow for realtime audio.

I did the zeners and opamps already because I'm terrified a real #eurorack module will explode me otherwise.

Fixed ramping on #synthdiy #microcontroller #micropython (#python) #muvco by eliminating high-pass input on CV. Had a mess on the front end and now have a theoretically correct and practically simple setup

Now to fix #ad9833 output--still a mess of ideas. One problem is it outputs <1V for sine and triangle but 5V for square. Fortunately you can't really clip a square, so I can slam everything to 12V and then scale down

One opamp to scale and bias, another to reinvert and unslam...?

Progress on the #microcontroller #micropython #synthdiy VCO. It makes sounds.

The octave control spans 6 octaves here and the tuning 2 octs. Other inputs do nothing yet--input needs scaling first.

Speaking of scaling, output of these aren't normalized to each other. <1V vs 3V3. How would I do that from a single output, #analog #electronics?

Except maybe I should really turn the sine to square anyway so I can PWM it (#ad9833 doesn't do pwm). Then normalization is free.

https://diode.zone/w/qa5pyoiSA1UaqEvJnJfua9

I was just about to post about how the #ad9833 was really kicking my ass, but then I Tried One More Thing.

The datasheet is kind of confusing and the examples I found online don't seem to work. (Could look at them again knowing how it should actually work and see what I/they missed.)

I got my A4! Now to turn the example code into a working prototype.

#esp32 #micropython #electronics #synthdiy

Good news: I got the #ad9833 to produce a sine wave.

Bad news: I was aiming for A4 and got A(-7).

Getting closer, tho....

#synthdiy #music #electronics

Low-Cost, Two-Channel Scriptable Waveform Generator - Microcontroller addict [Debraj] decided to make his own programmable sine wave gen... - https://hackaday.com/2022/03/05/low-cost-two-channel-scriptable-waveform-generator/ #digitalaudiohacks #functiongenerator #toolhacks #lowcost #ad9833 #dds