Comparator with AND gate (CB9407E)

This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the critical component of this circuit.

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Multipurpose Alarm (CB17301E)
We found this simple alarm circuit in a 1986 documentation. The circuit uses sensors of the NA...
Sound Operated Switch (CB6315E)
This sound relay or Vox was found in 70s RCA documentation. SCRs can be common types today and...
Beat Oscillator (CB4208E)
Placed near a common receiver, this oscillator is intended to generate a beating signal to receive...