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, […]
Security and Protection
Simple Contactless 220V Phase Detector Circuit using IC 4017
In this post we will see how to make Simple Contactless 220V Phase Detector Circuit using IC 4017, as this small tool help to check wire or cable if current is inside or not without touching it. Also, this circuit is very useful for electrician to find problem in big electric system; if current is […]
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 Radiation Sensor Circuit
Simple Radiation Sensor Circuit is like small spy for rays which one cannot see, it can smell different radiation like from light bulb, electromagnetic, or X-ray (ionizing one) etc. Furthermore, this circuit have special sensor when radiation detects sensor feels it and send signal. The circuit then uses that signal to modify things such as […]
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 […]