Negative Feedback Stage (CB6131E)

This circuit is from a 1967 US publication. The configuration can serve as a basis for designs with modern components.

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Basic Trigger (CB21462E)
This basic Schmitt trigger was found in an American publication from 1968. The circuit uses...
50 ohm Cable Driver (CB6137E)
This circuit is from an American 1964 documentation. Transistors of the time are used, but modern...
Ultra Simple Intercom (CB16486E)
This simple circuit uses small speakers for both listening and speaking (microphone). The feeding is...