Capacitor Test (CB26188E)

Found in a 1993 Electronics Experimenter Handbook, this circuit uses a multimeter to measure capacitance. The circuit is powered by 12 V.

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Octave equalizer (CB7978E)
Found in Precision Monolithics documentation from the 90's, this circuit equalizes octave signals...
FET Voltmeter (CB24295E)
This nice analog indicator circuit was found in the January 1974 issue of Radio Electronics...
Audio amplifier (CB7495E)
This small amplifier, with output less than 1 W, was found in a 1960 transistor manual from...