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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Digital Capacitor Meter (CB17506E)
This circuit was found in a 1986 documentation and it may be difficult to obtain some of its...
Schmitt Trigger (CB999E)
This circuit was found in an old publication about transistor. The original trasistors are...
Auto Answer Phone (CB5998E)
This circuit is for traditional old-style telephone lines found in an American 1980s...