Security
Fire Alarm with LDR Sensor
This is the fire alarm circuit which use LDR to sense the smoke from the fire, so it can be…
Heat Detector + Siren
This is the diagram of heat detector circuit which already integrated with siren circuit in the output. This circuit applies…
Pyroelectric Fire Alarm System
This is definitely an ultra-sensitive fire sensor that exploits the direct piezoelectric property of an ordinary piezo component to recognize…
LPG Gas Leakage Sensor Alarm
This is the schematic diagram of LPG gas leakage sensor alarm. The circuit operates off a 9V PP3 battery. Zener…
Electronic Siren based NE555
Here the circuit diagram of electronic siren based NE555. This circuit produces a sound like factory siren. It applies a…
Electronic Door Lock Security Key
This is the circuit diagram electronic door lock security key system. It means that this security system circuit is the…
Easy Build Motorcycle Alarm
The following circuit is a simple, cheap and easy build motorcycle alarm. The circuit just required 2 transistors to drive…
Simple Electronic Combination Lock
The following diagram is a very easy and simple electronic combination lock based on IC LS7220. Component Part List: C1…
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…