At this period the economy not good, Make have steal plentiful. We come to try build the circuit steal model to is simple better. The Alarm Sound (Super Bell) loud forever until will cut power supply to go out. When the Switch of the magnet Senate was opened or strip metal torn. The R1 stand [...]
Beeps if you leave open the door over 20 seconds
3V battery operation, simple circuitry
The track, closed into a small box, placed in the refrigerator in the vicinity of the light (if any) or open. With the closed doors inside the refrigerator is in the dark, the photo resistor R2 made the anti-high ( “200,000), thus [...]
At this period the economy not good, Make have steal plentiful. We come to try build the circuit steal model to is simple better. The Alarm Sound (Super Bell) loud forever until will cut power supply to go out. When the Switch of the magnet Senate was opened or strip metal torn. The R1 stand [...]
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