This SCR relaxation oscillator was found in an 80's Electronic Design. It flashes a small incandescent lamp in frequency that depends on the capacitor.
This diode tester was found in an English publication from the 1980s. Transistors are...
The circuit shown serves as a direction indicator or arrow for bicycles, robots and other...
This circuit can be used as a rhythmic light or as a control shield for incandescent lamps from...