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 […]
Alarm Circuits
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 […]
Simple Beeper Circuit
This Simple Beeper Circuit show us how to make a easy beeper circuit; when we press push button a sound comes from unbalanced multivibrator circuit, where a small speaker makes the sound. Also, this project is good to learn music and electronics and is also fun project for beginners. What is a Beeper Circuit: The […]
Infrared (IR) Sensor Alarm Circuit using TSOP1738
This tutorial show how to make a Infrared (IR) Sensor Alarm Circuit using TSOP1738, which finds intruder using light which we cannot see. Also, this alarm circuit uses infrared light so people call it IR alarm, which make one invisible light beam with small chip named IC 555. Moreover, if someone walk in front of […]