Unijunction SCR Trigger (CB21469E)

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

Simple VHF Receiver (CB19598E)
This VHF receiver with three transistors and loudspeaker listening was found in European...
Liquid level sensor (CB23807E)
This sensor was published in Radio Electronics magazine in April 1962. The two-transistor circuit...
Monostable LM3900 (CB19295E)
This circuit consists of a monostable multivibrator using the LM3900 transconductance operational...