Make a simple, cheap and reliable laser based security system. Download the manual from here: https://goo.gl/3R8bL2 COMPONENTS USED:- (1) One 220v-9v step down transformer. (2) Four diodes (1N4007). (3) One capacitor (1000uF). (4) One 7809 voltage regulator IC. (5) One resistor (100K). (6) One LDR. (7) One transistor (BC547). (8) One Buzzer.
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