Door Guard Knob Alarm circuit.
This is Door Guard Knob Alarm circuit with touch system. When thief caught on the door handle, makes it sound an alarm once. Use the the detector capacitance within the body.This project is a small and economical. Ideal for travelers or those who want security.
How does it works
The circuit working as Figure 1 a 9V battery there are the regulator to reduce voltage down to 5V . Which consist of a transistor-Q1,R1 and ZD1 serves as provide to some circuit. In circuit include the frequency generator of three set. Firstly set have L1,C2,C3 and Q2, the signal is coupling with C4, then them are bypass a negative range go out with D1 so have only a positive signal range to bias Q3.
This is Door Guard Knob Alarm circuit with touch system. When thief caught on the door handle, makes it sound an alarm once. Use the the detector capacitance within the body.This project is a small and economical. Ideal for travelers or those who want security.
How does it works
The circuit working as Figure 1 a 9V battery there are the regulator to reduce voltage down to 5V . Which consist of a transistor-Q1,R1 and ZD1 serves as provide to some circuit. In circuit include the frequency generator of three set. Firstly set have L1,C2,C3 and Q2, the signal is coupling with C4, then them are bypass a negative range go out with D1 so have only a positive signal range to bias Q3.
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