and an LED. You’ll then modify this circuit so that you can turn it on and off using fasteners like buttons, zippers, laces, hooks, and buckles. If you’re interested in trying this with a class or ...

Sadly, the ones I got are not very well executed – one side is rather dim, and they are hard to turn on and off because the push buttons are tiny ... transistor on and lights the leds. The 3n3 ...

Instead of simply replacing the outdated bulb, we decided to build a small dark detecting circuit with 2 yellow LEDs based on this Evil Mad Scientist Laboratories design. After successfully ...

I was puzzling over the classic bistable circuit and wondering if it was possible ... To make it more interesting (claims I), it is modified to light one of three LEDs by pushing the appropriate push ...

Evil Mad Scientist Labs brings us this easy to make LED blinking circuit. The idea is to put a LED in series with a small blinking incandescent bulb from a string of Christmas lights. The bulb has ...