I like history and I like medieval European coats of arms. Of course, nowadays, their design has its own rules … More
Automatic darkness activated light
It uses special candle flickering LEDs.
Joule thief candle
This is a basic Joule thief circuit. It uses one AA (1.5) battery. When batteries are almost empty. Then there … More
Ultrasonic distance measurements – freeform circuit
If you stand in front of it, it measures distance between you and displays it.