Full wave rectifier filter (CB7582E)

This circuit was found in a Popular Electronics from the 90s. The power source must be symmetrical and the operational amplifiers can be 741.

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Astable Timer 555 (CB9369E)
This circuit was obtained in a Hands-On Electronics from the 90's. The circuit turns on one LED at...
Tunnel Diode Listening Transmitter II (CB19426E)
This low power circuit for the FM band was found in a spy book from the 90s. The tunnel diode is...
VHF Modulator (CB13496E)
This oscillator is used to modulate video game signals or even small cameras so that they can be...