MOSFET Amplifier Stage (CB26315E)

Found in a 1990s Popular Electronics, this circuit uses a small transformer matched to the impedance of the speaker being driven.

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Analog speed game (CB20961E)
This quick response game was found in a Popular Electronics from the 80s. It uses only discrete analog...
Precision Current to Period Converter (CB17027E)
This circuit was found in documentation from National Semiconductor. Its purpose is to convert an input...
Colpitts Oscillator (CB4256E)
The frequency of this oscillator depends on the inductor and capacitors in parallel with it. In...