Touch alarm circuit is widely used for security, which is installed on the door. The advantages of this alarm is because the cost is cheap […]


Here is the circuit diagram of car headlight alarm. This device can be set for one or two functions: First, to indicate that the head […]

This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and receiver modules. This circuit works […]

This is a car alarm simulator which using the LED as a simulation output. This simple circuit can tell you whether your car is running […]

Here is the wailing alarm siren circuit diagram: Components List: R1,R5___________ 4.7K R2______________ 47K R3______________ 10K R4______________ 100K Rx______________ *see text C1,C4__________ 100uF/25V, electrolytic C2,C3__________ […]

This is the sound generator which will simulate British police car siren. The circuit is built using 2 pieces of timer IC 555 to generate […]

Here the circuit diagram of safer security system alarm. There are many security systems use a closed loop of wires and switches arranged so that […]

Flame, gas and smoke detector for fire alarm. You can combine this circuit with alarm circuit. The output will be the relay which switch on […]

Here is the circuit diagram of simple multitone alarm. This is a low cost circuit which is simple and easy to build. The main components […]