Peak Indicator (CB20736E)

This circuit triggers an LED when the input signal exceeds the peak, or the value set in RV1. The transistors can be the modern equivalents BC549.

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Infallible Alarm (CB18744E)
This alarm circuit was found in a 1990 documentation. However, since it uses only discrete...
Galvanometer protection (CB8374E)
This circuit protects galvanometers that are excited by low impedance amplifiers. The circuit is...
Two Transistor Amplifier (CB22534E)
This circuit is from a Radio Electronics from August 1952. Types of the time are used, the first...