4093 Sine Square Converter (CB26335E)

Found in a Popular Electronics from the 90s, this circuit operates up to about 5 MHz input.

Pulse Generator (CB5918E)
This circuit makes use of a transconductance operational amplifier. It generates signals with TTL...
Modulation Using na UJT (CB224E)
This circuit uses na Unijunction Transistor (UJT) to produce a modulation tone for several...
Opto relay using two couplers (CB7414E)
This circuit was found in General Electric documentation from the 1980s. The circuit uses couplers...