Scanner squelch (CB9424E)

Found in Popular Electronics from the 90s, this circuit mutes a scanner's speaker in the absence of a voice signal, thus eliminating the hiss.

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Recording tapes eraser oscillator (CB7303E)
This 70 kHz oscillator is used to erase tapes in pre-recording. The circuit is from 1968 General...
Automatic Frequency Control (CB4101E)
We found this circuit in an old documentation for hams. In it we have the way to use a varicap to...
Touch or Proximity Alarm (CB17329E)
This sensitive touch circuit that triggers an oscillator uses only transistors. The circuit is...