This Simple Entrance Alarm Circuit designed to safeguard doors and entry passages. It emits a loud alarm when someone passes through the invisible infrared barrier. The system operates reliably during both day and night, minimizing false alarms. The circuit is simple making it an ideal evening project for hobbyists. Circuit Working: Parts List: Category Item […]
Alarm Circuits
Home » Alarm Circuits »
Simple Smoke Alarm Circuit
This smoke alarm circuit is like a super smelling nose for your house. It sniffs out smoke in the air and if it finds any it sets off an alarm. This alarm can be a loud buzzer, a flashing light or even a signal to turn on other alarms in your house. The smoke detector […]
Simple Shadow Detector Security Alarm Circuit
This Shadow Detector Security Circuit is like a guardian with super sight. It uses a light sensitive piece like a photodiode to watch for shadows moving in a specific area. If something blocks the light and creates a shadow the circuit knows someone might be there and triggers an alarm. This can be a loud […]
Simple Ultrasonic Security Alarm Circuit
An Ultrasonic Security Alarm Circuit acts like an invisible force field for your home. It uses high frequency sound waves, like super squeaks that humans cannot hear to detect movement. Imagine the circuit sending out these sound waves and then listening for them to bounce back. If something walks through the area and disrupts the […]
Simple Siren Circuit
This article shows you how to build a circuit that makes a sound like a real siren! The sound goes up and down in pitch really fast, just like a police car or ambulance siren. This can be a fun project but remember sirens are also used for emergencies. Circuit Working: Parts List: Category Description […]
Simple Infrared Alarm Barrier Circuit
This circuit shows you how to build a tripwire alarm using invisible light. Imagine a light beam like a fence. If someone walks through the beam interrupting it, a loud alarm goes off to scare them away and let you know someone is there. This is a fun project but remember real security systems are […]