This Simple Entrance Alarm Circuit protects a door or entryway; it produces a loud sound when someone passes through an invisible IR light beam. Furthermore, it works good at day and night by not giving much wrong alarm; also the circuit is simple and good for hobby people during nighttime. Circuit Working: Parts List: Components […]
Alarm Circuits
Smoke Alarm Circuit
To begin with, this smoke alarm circuit works like a house with a sensitive “nose,” because it detects smoke in the air and when it senses smoke, it immediately triggers a loud alarm. In addition, the alarm can be a buzzer, a blinking light or any other alert device that activates to warn people. Furthermore, […]
Simple Shadow Detector Security Alarm Circuit
This Simple Shadow Detector Security Circuit is like one guard with very sharp eyes, which uses one light sensor like photodiode to look shadow in one place. If something stop the light and make shadow, then the circuit think someone is there and start an alarm; alarm can be loud sound, blinking light or something […]
Ultrasonic Security Alarm Circuit
Ultrasonic Security Alarm Circuit work like invisible wall for ones home, as it uses very high sound wave like tiny squeaky noise which human ear can not hear it uses this to find the movement. Think like circuit sends sound wave then it waits to hear echo come back and if someone walk in the […]
Simple Multi Siren Tones Circuit using IC UM3561
This Simple Multi Siren Tones Circuit using the UM3561 chip works like a small sound box for emergency vehicle sounds. Moreover, the special UM3561 chip can create many siren noises, such as the “wee woo” sound of a police car or the fast tone of an ambulance. Furthermore, it only needs few more parts and […]
Multi-Tone Electronic Siren Circuit
In this article for Multi-Tone Electronic Siren Circuit make it more fun with one siren circuit that makes many sounds. Also, this small thing work like alarm sound toy which is good as warning. But not just one boring sound it makes many loud noise one after one or same time!; and it works well […]