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Electronics Circuit Refrigerator Door Alarm for refrigerator repair

By admin | Published: February 24, 2010
Electronics Circuit Refrigerator Door Alarm for refrigerator repair Parts: R1______________10K 1/4W Resistor R2_____________Photo resistor (any type) R3_______________2M2 1/4W Resistor R4_______________1M 1/4W Resistor C1______________10µF 25V Electrolytic Capacitor C2_____________100nF 63V Polyester Capacitor D1____________1N4148 75V 150mA Diode IC1,IC2_________7555 or TS555CN CMos Timer ICs BZ1___________Piezo sounder B1____________3V Battery
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Fire alarm beeping circuit diagram

By admin | Published: March 9, 2010
Fire alarm beeping circuit diagram
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