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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Electronic Labyrinth (CB18170E)
This project was obtained in a 1982 documentation. The board consists of a labyrinth with trails...
3 W amplifier with 741 (CB16540E)
This is a traditional circuit in which a 741 operational amplifier is used as an audio amplifier with...
Capacitance Relay (CB4992E)
This capacitance or approximation relay was found in an ancient American documentation. The SCR...