It normally takes two transistors to build a blinker circuit (in order to make positive feedback possible). However, you can also use a photo-resistor (LDR) that is illuminated by an LED. The feedback ...

There was an error while loading. Please reload this page. In this project I prototyped a LED Blinker PCB, or in essence, an Astable Multivibrator with 2 LEDs. I did ...