Phone noise canceler (CB9402E)

This circuit was found in a 1967 American documentation. The circuit uses components of the time, applying to analog lines.

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Delayed relay (CB10191E)
This simple SCR delay circuit for activating a relay was found in documentation from the 1980s. The...
Triac Power Control (CB6551E)
We found this circuit in a 1964 Electronic Design. The triac and SCR can be replaced with modern...
Emitter Follower Detector (CB12236E)
This circuit is suggested by an English publication from 1980. It is an RF detector that uses a...