bornach,
@bornach@fosstodon.org avatar

Pulsating PWM using two #LM358 dual #opamps 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
#electronics #OperationalAmplifiers #LEDs

Breadboard prototyping of a 4 opamp circuit using 2 LM358 integrated circuits and a number of passive components, hooked up to an oscilloscope that displays the duty cycle of the output waveform slowly varying from 0% to 100% then back to 0% and the cycle repeats. A red LED gets brighter then dimmer, in antiphase with a green LED that goes dimmer then brighter

bornach,
@bornach@fosstodon.org avatar

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 #opamps (#LM358) configured as an oscillator and 3 comparators. An NPN transistor sinks the current for each of the LED colours.
#LEDs #electronics

RGB LED strip connected to a breadboard circuit consisting of three LM358 dual opamps, 3 NPN transistors, and a few resistors. Three linear potentiometers control the PWM duty cycle for each of the three colour channels: red, green, and blue.

bornach, (edited )
@bornach@fosstodon.org avatar

Using 7 dual #opamps (LM358) to generate PWM signals for driving a non-addressable RGB LED strip so that only one linear potentiometer is needed to sweep through the colours of the #rainbowFlag

Project inspired by
https://youtu.be/KMuTTQeQ4_c
in which @blitzcitydiy used a microcontroller to map a potentiometer to the range of hues

#PrideMonth #electronics #opampChallenge #LEDs

bornach,
@bornach@fosstodon.org avatar

My video on how the various #OpAmp circuits were combined to map RGB rainbow colors to a single 10K potentiometer
https://youtu.be/Xqs-TMLpqKY

My project page for the @hackaday #opampChallenge
https://hackaday.io/project/191418-rainbow-led-effects-using-pwm-generated-by-opamps

#electronics #LEDs #analog

blitzcitydiy,
@blitzcitydiy@mastodon.social avatar

@bornach sweet!

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