AC Tachometer (CB9353E)

This circuit was found in a 1969 EEE. It detects when there is a phase failure in a circuit using an inductive sensor.

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80 MHz cascode amplifier (CB10065E)
This circuit was found in documentation from the 70s. We can try current JFET transistors....
Power supply for amplifier (CB23879E)
This is the power supply circuit for the amplifier in the previous circuit. The source is...
LM386 Bridge Amplifier (CB25300E)
This bridge circuit is designed for 8-ohm speakers delivering a few watts of power. The circuit is from...