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…

55 years ago

Heat Detector + Siren

This is the diagram of heat detector circuit which already integrated with siren circuit in the output. This circuit applies…

55 years ago

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…

55 years ago

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…

55 years ago

Electronic Siren based NE555

Here the circuit diagram of electronic siren based NE555. This circuit produces a sound like factory siren. It applies a…

55 years ago

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…

55 years ago

Easy Build Motorcycle Alarm

The following circuit is a simple, cheap and easy build motorcycle alarm. The circuit just required 2 transistors to drive…

55 years ago

Simple Electronic Combination Lock

The following diagram is a very easy and simple electronic combination lock based on IC LS7220. Component Part List: C1…

55 years ago

Wireless Car Alarm

This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and…

55 years ago

Car Alarm Simulator

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

55 years ago