How to Make DIY Security Alarm Device with a Reset Button | DIY Project

How to build a simple security alarm system with a reset button.
This device is based on a simple flip flop circuit.
How it works:
If you move the magnet from the reed switch or if someone cuts the wires that go to the reed switch, it will trigger the alarm. Also, you can pull thin wire and connect to this device, and if someone breaks the wire it will trigger the alarm also.
How to reset:
After the door closed/wire connection restored - circuit became closed, is so then you can press the reset button and reset this alarm.
What you need to build this device:
4 transistors BC547B.
6 resistors 10K.
2 resistors 1K .
A button for reset.
Active 12V buzzer.
A reed switch.
Magnet.
Wires.
Powering:
Any DC power source from 5 to 12 volt.
(better use power supply, because when the device is ON it always consumes some energy)
If you don't need reset button functionality, you can build a lot simpler circuit, watch this video: • DIY Tripwire security ...