Balanced modulator (CB7927E)

We found this circuit in a 1968 Hughes publication. The components are from the era and can be replaced by modern equivalents.

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Pulse stretcher (CB8914E)
We found this circuit in a 90s Popular Electronics. It increases the duration of a pulse in a...
Liquid Level Detector (CB5316E)
This simple circuit detects when a conductive liquid reaches the sensors. The circuit has no...
DC to AC converter (CB9668E)
This converter or inverter uses components that are still common. The transformer is the type...