This is the fire alarm circuit which use LDR to sense the smoke from the fire, so it can be…
This is the diagram of heat detector circuit which already integrated with siren circuit in the output. This circuit applies…
This is definitely an ultra-sensitive fire sensor that exploits the direct piezoelectric property of an ordinary piezo component to recognize…
This is the schematic diagram of LPG gas leakage sensor alarm. The circuit operates off a 9V PP3 battery. Zener…
Here the circuit diagram of electronic siren based NE555. This circuit produces a sound like factory siren. It applies a…
This is the circuit diagram electronic door lock security key system. It means that this security system circuit is the…
The following circuit is a simple, cheap and easy build motorcycle alarm. The circuit just required 2 transistors to drive…
The following diagram is a very easy and simple electronic combination lock based on IC LS7220. Component Part List: C1…
This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and…
This is a car alarm simulator which using the LED as a simulation output. This simple circuit can tell you…