3-decade VCO (CB21326E)

This circuit generates signals from 10 Hz to 10 kHz. We found it in a Popular Electronics from the 90's. The components admit equivalents.

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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...