Want to protect our home or room from intruders? then this simple IR Burglar Alarm Circuit is our smart security buddy! It uses invisible IR light to sense any movement or break in the beam; the moment someone crosses the path, a loud buzzer alerts us instantly. Moreover, its easy to build, with low cost […]
Alarm Circuits
Arduino Based Motion Dog Barking Alarm Circuit
This Arduino Based Motion Dog Barking Alarm Circuit make dog sound when motion detects, it uses Arduino Nano, Pir sensor, Dog Sound Module, BC547 transistor, IC LM386 Amplifier Module and 8Ω Speaker. When Pir senses human or animal move, then Arduino play dog bark sound to scare intruder, also this is simple and low cost […]
Luggage Safety Alarm Circuit using IC LM358
Today security is big problem everywhere; many time thief try to open bag or suitcase in bus, train or station, therefore, we cannot always keep our eye on our luggage. So this small Luggage Safety Alarm Circuit using IC LM358 is a solution which help to protect our bag, as it uses piezo sensor and […]
Simple Wire Loop Security Alarm Circuit
A simple wire loop alarm is a small security circuit that uses a thin wire as a sensor loop and if someone cuts or opens the loop, the buzzer sounds. Also, it works on 9V battery, needs few parts, is cheap and easy to make. Circuit Working: Parts List: Components Values Qty Resistors 4.7M 1/4 […]
Refrigerator Door Open Alarm Circuit with IC 555
Sometimes, people forget to close the fridge door and this causes loss of cooling and waste of electricity; so to solve this problem we can use a simple Refrigerator Door Open Alarm Circuit with IC 555 When the door stays open, the buzzer gives a sound, so it reminds the user to close the doo; […]
Sound-to-Beep Circuit using IC CD4049
Sound-to-Beep Circuit using IC CD4049 is a fun project, where we hear whistle which beep for 3 sec; also circuit is good for door alarm, remote control other sound things. Moreover, it has mic for sound, op-amps from CD4049 and transistor for buzzer and it runs on 3V battery. Circuit Working: Parts List: Components Values […]