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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Gain 10 Tone Detector (CB4906E)
This circuit was found in an application note of the LTC1164 from Linear Technology of the 1990s....
Telephone amplifier (CB9400E)
This circuit was found I a 1965 Radio Schack documentation. The transistors are from that time,...
AND gate with LM3900 (CB25173E)
The figure shows how to implement the AND function with a Norton LM3900 operational amplifier. The number of...