Unijunction SCR Trigger (CB21469E)

This unusual unijunction transistor SCR firing circuit was found in a General Electric documentation from the 1960s.

Remote Volume Control (1) (CB12469E)
The intensity of an audio signal can be controlled by a remote potentiometer on a DC circuit,...
Car Alarm (CB3835E)
This alarm circuit is from a 1987 publication, however the components used are still modern. The...
TTL Function Generator (CB18884E)
This voltage-controlled function generator circuit was found in ancient European documentation. The circuit...