Alarm
Sound Effect Generator UM3561
This is a really simple sound effect generator based single sound generator chip UM3561. The UM3561 will generate four kinds…
Touch Alarm System
Touch alarm circuit is widely used for security, which is installed on the door. The advantages of this alarm is…
Car Headlight Alarm
Here is the circuit diagram of car headlight alarm. This device can be set for one or two functions: First,…
Wireless Car Alarm
This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and…
Car Alarm Simulator
This is a car alarm simulator which using the LED as a simulation output. This simple circuit can tell you…
Wailing Alarm Siren
Here is the wailing alarm siren circuit diagram: Components List: R1,R5___________ 4.7K R2______________ 47K R3______________ 10K R4______________ 100K Rx______________ *see…
British Police Car Siren
This is the sound generator which will simulate British police car siren. The circuit is built using 2 pieces of…
Safer Security System Alarm
Here the circuit diagram of safer security system alarm. There are many security systems use a closed loop of wires…
Flame, gas and smoke detector
Flame, gas and smoke detector for fire alarm. You can combine this circuit with alarm circuit. The output will be…
Simple Fire Alarm with Thermistor and NE555
The following circuit is a simple fire alarm circuit based NE555 timer and use thermistor as a temperature detector. This…