Voice Activated Switch (CB5982E)

This 80's documentation circuit includes an amplifier of the era. Used integrated circuits are uncommon today but can be used equivalents.

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Impedance Matcher for Audio (CB793E)
This circuit is used to match a high impedance input source with a low impedance output device...
Miller Oscillator (CB5121E)
This crystal-controlled oscillator was obtained from an American 1980s documentation. The circuit...
Adapter for transistor test using a multimeter (CB3925E)
We found this adapter in a 1970s American documentation on instrumentation. It is suitable for analog...