First pulse preserver (CB9259E)

This circuit was found in a 1967 EEE. The components are from that time, but the circuit can be implemented with modern equivalent components.

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Intelligent Protection (CB17477E)
This circuit deactivates devices powered by the power grid so that when the power returns, they do...
Tone relay (CB11899E)
The trigger signal for this circuit is an audio tone. Tones up to close to 100kHz can be used. The...
Decibel Meter (CB24299E)
Found in the March 1974 Radio Electronics magazine, this circuit is designed to measure the level...