This is a simple flashing led circuit with 2 leds and 2 NPN transistors. It illustrates the behavior of transistors and capacitors and if you use an oscilloscope it will be very easy to determine what ...

I was puzzling over the classic bistable circuit and wondering if it was possible to expand it to any number of channels. And this is what I came up with.

They are *all* designed around a 12v power input. We did this in a quest to have the LED properly lit by a 3.3v source. Turns out, it is stupid simple (but mildly annoying).

January 20, 2017 If you’re looking to control WS2812 (or Neopixel) LEDs using a microcontroller running at 3.3 volts, you might run into some issues.