42 kHz oscillator (CB21805E)

This circuit was used as an eraser for old tape recorders. The circuit is from a 1960 Mullard transistor manual.

Mini Drone (CB25105E)
This experimental drone circuit was published in a Radio Electronics magazine article from...
1.5 V LED Flasher (CB20423E)
This circuit causes an LED to blink from the 1.5 V supply thanks to the use of a voltage doubler. The...
For Lamps or Fans Dimmer (CB10003E)
This circuit consists of a traditional version of dimmer with triac and was found in a 2000...