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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Simple voltmeter (CB23544E)
This is the circuit of a sensitive voltmeter using a difficult-to-obtain 5 uA full-scale...
Electroscope (CB11331E)
The circuit is from the United States Hands-On Electronics magazine, February 1987 edition. The...
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