Unijunction SCR Trigger (CB21469E)

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

Stepper Motor Experimental Circuit (CB17994E)
This experimental circuit for moving a stepper motor was found in a 2002 documentation. However, given...
Opens and closes effect 4017 (CB17143E)
This interesting circuit causes a set of LEDs to flash at a speed controlled by the CI1 in an...
Very low frequency pass filter (CB5200E)
This filter lets a range of 0.1 to 10 Hz pass. We find it in a 1980s documentation, but it can be...