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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Fast Logarithmic Converter (CB5104E)
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Crossing Signal For Railroad Modeling 3 (CB3856E)
This circuit uses two sensors that are placed at the intersection of a miniature railroad, causing the LED...
Darlington Amplifier Stage (CB974E)
I found this circuit in a doc umentation from the year 1968. It uses germanium transistor and has...