Metal detector (CB7888E)

This circuit was found in a 1970s RCA publication. Transistors support modern equivalent types. Observe the dimensions of the explorer coil.

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Display brightness control (CB21614E)
Based on Allegro's A6275, this circuit controls the brightness of various displays. The circuit is valid...
AM Transmitter (CB513)
This small transmitter can act as a wireless microphone operating in the medium wave range,...
SCR dimmer (CB21652E)
This is the circuit of an RCA Dimmer sold in 1967. With it it is possible to control a load up to...