RTTY Demodulator (CB21760E)

This circuit was found in a 1977 radio amateur manual. Integrated circuits are operational amplifiers of the time.

Stabilized Colpitts Oscillator (CB22395E)
This Colpitts oscillator with JFET has the amplitude of the signals stabilized by a diode. The...
Random Pulse Generator (CB12642E)
This circuit can be used with the CIR12642E TTL Roulette, or other game circuits that must draw...
Overvoltage and Undervoltage Relay (CB17023E)
This conventional window detector circuit was found in a 1995 documentation. The trigger points, that...