Transformerless Wideband Switch (CB6457E)

We found this chopper circuit in a 1967 publication. The transistors are of the time, and current equivalents can be used.

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Coffee Warmer (CB21380E)
Found in a 1967 RCA manual, the purpose of this circuit is to keep the coffee warm in an electric...
High Speed Amplifier OP05 (CB19711E)
The operational amplifier used in this application is uncommon today. This Raytheon circuit can be...
22 Second Time Circuit (CB16687E)
We found this circuit in an article of our own from 1992. The circuit is based on an integrated circuit...