Security switch (CB8514E)

This shield circuit was suggested by a 90s Popular Electronics. The circuit can use either a triac for a common load or a mechanical relay.

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Power Supply 15 V x 300 mA (CB17356E)
This simple, unregulated power supply is indicated for non-critical projects that require currents up...
Linear Optocoupler (CB17606E)
This circuit is suitable for isolating audio signals, as it has very low distortion. The used...
Microphone Preamplifier (CB7016E)
This circuit was designed to work with the previous one in triggering a relay by the sounds picked up...