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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5-Range Ohmmeter for DVM Module (CB25226E)
This circuit for a digital module was found in the September 1989 Radio Electronics magazine. The...
Triac power control with (CB4679E)
This is one of the possible triac power control configurations using as a trigger element a...
Infrared detector (CB7019E)
Found in Popular Electronics from the 90s, this circuit detects modulated infrared radiation and...