This circuit shows you how to build a storm chasers tool a lightning detector! Lightning makes a special kind of electricity in the sky. This circuit can sense that electricity and light up or make a sound to warn you when a storm is nearby. This can give you extra time to get inside before […]
Sensors and Detectors
Simple Mobile Phone Detector Circuit using Op-Amp
This article shows you how to build a circuit that can sense nearby cell phones. It picks up on the invisible radio signals that cell phones use when they are turned on and can be used to let you know if someone is using a phone in an area where they should not be like […]
Simple Anti Corrosion Free Liquid Level Sensor Circuit
This circuit shows you how to build a sensor to check the liquid level in a tank or container. It uses special probes that can tell if there is liquid touching them by sending a tiny electrical signal. This circuit design helps prevent corrosion because it does not use any harsh chemicals. Circuit Working: Parts […]
Capacitive Proximity Sensor Circuit
This sensor circuit is like an electronic watchdog for people. It uses electrical parts to know if someone is nearby. These circuits are often used in things like security systems, lights that turn on automatically and smart home devices. The circuit works by noticing changes around it especially those caused by a person being close. […]
Simple Lie Detector Circuit
Have fun building this lie detector circuit! While it wont be perfect real lie detectors are much more complex, it can be a fun way to learn about how our bodies react to stress. This circuit uses changes in sweat to see if someone telling the truth people sweat more when they are stressed or […]
Simple RF Sensor without Battery Circuit
This article shows you how to build a simple tester to see if a radio transmitter is working without needing any batteries. The tester itself gets its power from the radio waves the transmitter is sending out and lights up an LED to show it is working. What is a RF Sensor without Battery: A […]