2-way intercom (CB23561E)

This circuit was found in Radio Electronics magazine from June 1958. The maximum distance depends on cable losses. More stations can be added.

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Simple SCR alarm (CB22090E)
This circuit drives a buzzer or electric buzzer but can be used to trigger a relay or other load....
10 kV power supply (CB9440E)
Found in Popular Electronics from the 90s, this circuit can be used for high voltage applications and...
ESMP Surface Mounting Schottky diodes (COM061E)
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