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 […]
Alarm Circuits
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 […]
Touch Controlled Musical Door Bell Circuit
No more boring ding dong bell! This Touch Controlled Musical Door Bell Circuit show how to make doorbell which play small music tune; just press a button and it rings a melody sound which we can choose which one. Also, this circuit is fun idea to make door more special and different. Circuit Working: Parts […]
Simple Siren Circuit
To begin with, this Simple Siren Circuit article show how to make circuit sound like real siren! here, the sound goes up and down fast like police car or ambulance siren. Also, building this type of circuit is fun, but remember that people use sirens during emergencies. Circuit Working: Parts List: Components Values Quantity Resistors […]
Infrared Alarm Barrier Circuit
This Infrared Alarm Barrier Circuit shows how to use light which we cannot see to make tripwire alarm; it also work like beam of light for small fences. When someone walk in front of light and break it, loud alarm make big noise to warn and scare person; it is fun project to do but […]
Simple Day Night Activated Switch Circuit using a Triac and LDR
Simple Day Night Activated Switch Circuit using a Triac and LDR show how to make circuit which turns ON and OFF things by seeing outside light; also we only need one light sensor (LDR), one resistor, one capacitor and one special switch called Triac. Moreover, many alarm systems use this circuit because it turns ON […]