The working principle of the circuit.Most of the alarm circuit at night are often used and some instant IC op-amp to application The circuit, to present this as well. We use IC Timer 555 used a lot number one built. The circuit is a circuit, monostable multivibrator which use R2 resistor and capacitor C1 เป็นตัวกำหนด time begin first condition. LDR1 which is LDR (Light dependent resistor) when the light comes in the LDR current flowing through the LDR is high, due to มีความต้านทาน low. The legs of a 2 IC555 on down the ground. And when a light resistance of LDR is high, make a flowing stream, less LDR1 will send signals to stimulate the 2 legs. IC1 work makes piezo size 6V loudly.
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