Complete Alarm with NO and NC Sensors (CB24141E)

We found this circuit in the July 1971 Radio Electronics magazine. The circuit activates a Sonalert or a relay for a higher power warning system.

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Electronic Compass (CB25382E)
This circuit was found in the June 1991 issue of Radio Electronics magazine. The circuit uses two...
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Increasing zener voltage with LED (CB22134E)
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