Jumat, 31 Juli 2009

Fridge door Alarm





Parts:

R1____________10K 1/4W Resistor
R2___________Photo resistor (any type)
R3,R4________100K 1/4W Resistors

C1____________10nF 63V Polyester Capacitor
C2___________100µF 25V Electrolytic Capacitor

D1,D2_______1N4148 75V 150mA Diodes

IC1___________4060 14 stage ripple counter and oscillator IC

Q1___________BC337 45V 800mA NPN Transistor

BZ1__________Piezo sounder (incorporating 3KHz oscillator)

SW1__________Miniature SPST slide Switch

B1___________3V Battery (2 AA 1.5V Cells in series)

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