AC Tachometer (CB9353E)

This circuit was found in a 1969 EEE. It detects when there is a phase failure in a circuit using an inductive sensor.

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20 W amplifier (CB18719E)
This simple amplifier with transistors was obtained in a documentation of the 90's requiring a...
Non-Inverter Amplifier LM139 (CB14247E)
The presented circuit uses a symmetrical power source to supply an amplifier with the LM139 or...
4-channel system Amplifier (CB24168E)
This is half of a 4-channel amplifier from a system published in the October 1971 issue of Radio...