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An LED is a light-emitting diode. Lighting an LED is considered the "Hello world" of a circuit design, and it can be as simple as using a series resistor, or it can get more complicated, involving PWM and multiplexing.

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Critique please - Arduino switching/dimming 24 V LED strip using 20 kHz PWM

I've created a circuit which allows me to dim a 24 V LED strip using 20 kHz PWM (because I'm interfacing with audio) from an Arduino. …
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