Unijunction SCR Trigger (CB21469E)

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

Adjustable DC Protector (CB18113E)
This circuit from a 2003 documentation, has a protection system that disarms the power supply if...
Versatile Timer (CB21420E)
This circuit was obtained from an old American documentation, and practically any general-purpose transistor...
Sweep Generator (CB3955E)
In the figure we have the circuit of a sweep generator obtained in an old publication. The central...