These circuits use a CdS photocell to simulate motion detection, by sensing shadows and other small disturbances in ambient lighting caused by nearby people.Reverse engineered circuit diagram of the sensor circuitry out of a very sensitive children’s photoelectric Room Gaurd toy. The original toy would talk and make alarm sounds, whenever an intruder walked by or cast any kind of shadow onto the photocell. This circuit has immunity to battery voltage transients.
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