Mini Radio AM (CB20322E)

In this receiver the is formed by 80 turns of wire 28 or close in a ferrite rod. The handset is low impedance and powered by a standard battery.

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Multiple Alarm (CB20628E)
We found this circuit in a 1985 technical publication. The circuit uses PUTs to drive lamps....
Megaphone (CB23631E)
This high-powered megaphone circuit is from a Radio Electronics from December 1964. Note the use...
Instrumentation Amplifier (CB14090E)
This amplifier with differential input uses two old op amps but can be implemented with modern op amps....