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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Instrument Scale Modifier (CB4159E)
Using a zener diode it is possible to change the linearity of the scale of an analog instrument by...
Voltage Relay (CB4151E)
This circuit causes the relay to be energized when the input voltage exceeds the voltage value of...
Voltage Regulator Using the 723 IC (CB417)
This circuit can be used in 0,5 to 37 V Power supplies and output currents up to 3 A. The...