SCR Rain or Leak Alarm (CB22097E)

This sensitive circuit was found in old documentation. The SCR can be any of the 106 series and the transistor a BC548.

Clef Generator (CB827E)
This circuit produces a clef sound when a pulse is applied to its input. The damping effect is...
Microphone Amplifier (CB14330E)
This circuit can serve as the basis for a simple phone. The LM10 is not common today, but the...
Optical Link Receiver (CB4945E)
This is a possible circuit for the receiver of the previous circuit. Other circuits can be found...