Micro amplifier (CB23733E)

This direct coupled amplifier using 3 transistors and low voltage power was found in the April 1961 Radio Electronics magazine.

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Telemetry demodulator (CB9693E)
Found in old American documentation, this circuit demodulates signals from 1 kHz to 10 kHz for...
Resistor Test (CB17501E)
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Emergency Pulser (CB4548E)
This circuit was obtained from an English magazine from 1985. It consists of a pulser that drives...