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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Error Amplifier and Trigger Generator (CB19981E)
This circuit was found in old documentation. The components can be replaced by modern ones. The...
Active Tone Control (CB18728E)
This transistor circuit consists of a well-known bass and treble control configuration. The...
Fast Photo Darlington (CB14647E)
With the circuit shown, you can have a fast response with a Darlington configuration. The circuit is...