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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Antique OC74 800 mW Transistor Amplifier (CB12903E)
This circuit was found in many record players with crystal phono pickups. The output power is 800...
VCO 8038 (CB16028E)
The 8038 is an integrated waveform generator (sinusoidal, triangular and rectangular) from...
Modem protector (CB8190E)
This protector was found in an Electronics Now from the 90s. The 250 V transient suppressors are common...