In this Mobile Phone Detector Circuit using Op-Amp we will show how to make one circuit to detect mobile phones nearby. It can catch the radio signal from phone when phone is ON and it tells if someone using phone in quiet place like meeting room or library where phone are not allowed. But be […]
Sensors and Detectors
Anti Corrosion Free Liquid Level Sensor Circuit
This Anti Corrosion Free Liquid Level Sensor Circuit show how to make sensor for checking water level in tank or container. It send small electric signal and uses some metal pins to know if water touches them or not. No strong chemical is used in this circuit so metal do not get rust or damage. […]
Capacitive Proximity Sensor Circuit
This Capacitive Proximity Sensor Circuit circuit work like human electronic watchdog. It feel when someone comes close by using electric parts. These kind of circuit are used in smart home things, auto light and security system. The circuit sees changes around it and mostly when person come near. Then it does something like blink light […]
Simple Lie Detector Circuit using Transistors
Have fun making this Simple Lie Detector Circuit using Transistors. Real lie detectors are very hard and complicated so this one is not perfect. But it is fun way to see how body react when stress. This circuit works by checking sweat changes to know if someone tell truth or lie. When people are scared […]
Simple RF Sensor without Battery Circuit
This article for Simple RF Sensor without Battery Circuit show how to make small tester with no battery. It help check if radio transmitter is working or not. The tester get power from radio waves which is sent through transmitter. If transmitter works LED light will blink to show it. What is a RF Sensor […]
Simple Metal Detector Circuit
This article show a special trick to make a Simple Metal Detector Circuit It uses simple circuit not like other circuits and needs only one transistor. The circuit find metal by catching signal from a normal radio. What is a Metal Detector: Metal detector is electric circuit made to check if metal is close or […]