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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Infrared Sensor with the MC3373 (CB4580E)
An interesting option is the one that makes use of the MC3373 integrated circuit and which is...
Crystal oscillator (CB24015E)
We found this circuit in a Radio Electronics from February 1970. The frequency of 1,400 kHz in the...
Direct Output Coupling Amplifier (CB6202E)
This power step drains just 3.5 mA from the battery and can provide good playback on a 4-ohm...