Unijunction SCR Trigger (CB21469E)

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

Crystal oscillator with compensation (CB9642E)
This temperature compensated circuit was found in a 1980s American documentation. The power supply...
LM3914 Single Powered Voltmeter (CB25456E)
This circuit is an improved version of the previous ones with the LM3914. We found it in the March...
Precedence Indicator 2 (CB12329E)
This indicator was found in a 1974 publication, but it can be fitted with the BC548 transistor or...