AC Delay (CB21433E)

This trigger-delay circuit was found in a 1960s General Electric unijunction transistor manual. The circuit applies to the 2N2646.

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Preselector with JFET (CB9170E)
This circuit was found in a Popular Electronics from the 90s. The circuit uses a general purpose...
Octave equalizer (CB7978E)
Found in Precision Monolithics documentation from the 90's, this circuit equalizes octave signals...
Field strength meter (CB7564E)
This circuit that appears in similar versions on this site was found in a Popular Electronics from the...