Negative Ion Generator (CB25366E)

We found this voltage multiplier circuit in a Radio Electronics magazine from December 1991. The high voltage transformer is an adapted flyback

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Infrared Laser Gun (CB16977E)
This circuit, from a 1990 documentation, can serve as a basis for a game of target-game. The...
FM Transmitter (CB21695E)
While BC547 is not a suitable transistor, it can work on this circuit. The ideal would be the...
Regulated 5 V Power Supply LM309k (CB20195E)
This power supply that we found in an old American documentation uses an integrated circuit that...