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#opamps — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #opamps, aggregated by home.social.

  1. I found the culprit... It's the #TL072 that goes into phase reversal because the gate and trigger signals are -12V when low.
    After swapping it with a #LM358, the output signals for trigger and gate, including the LEDs work as intended.
    This took a lot of time to find out, but I've gained some knowledge now.
    #PhaseReversal #OpAmps #BugFixing

  2. I made a small voltage rail splitter using an #LM358 #OpAmp that I salvaged from an old motion detector.
    I want to play around with #OpAmps and thought it would be nice to have a #circuit for creating a virtual ground reference with positive and negative voltages.
    The boost converter is only for testing, I'll connect a 24V supply later.
    Only thing I have to adjust is the inrush current.
    I'll convert it to a soldered perfboard, too.
    #electronics #diy #dualrail #powersupply #breadboard #KiCad

  3. Op Amp Contest: Generate Spirograph Shapes Using Only Op Amps and Math - If you’re a child of the ’80s or ’90s, chances are you’ve spent hours tracing out ... - hackaday.com/2023/06/05/op-amp #hypotrochoid #epitrochoid #spirograph #toyhacks #mcp6004 #opamps #art

  4. Three potentiometers control the duty cycle for pulse width modulation of the three colour channels of an RGB LED strip (non-addressable). The PWM signal is generated by (#LM358) configured as an oscillator and 3 comparators. An NPN transistor sinks the current for each of the LED colours.

  5. Pulsating PWM using two dual configured as a fast oscillator, a slow oscillator, and a comparator whose output is the source of one LED and the sink of another LED

    No microcontroller required