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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Visual metronome (CB21062E)
Based on the well-known LM3909, this LED pulser circuit was found in American documentation from...
Electronic Power Switch (CB11322E)
With this circuit (shield) we can control a load from 500 mA to 1 A, depending on the transistor, using a...
18 V x 1 A power supply (CB13355E)
This conventional configuration of source stabilized with zener and transistor was found in a...