This sensor circuit functions similarly to a human electronic watchdog. It senses if someone is close by using electrical components. These circuits are often found in smart home appliances, automatic lighting and security systems. The circuit detects changes in its environment particularly those brought on by a person nearby. Based on this it then takes […]
Sensors and Detectors
Simple Lie Detector Circuit using Transistors
Enjoy making this circuit for detecting lies! Real lie detectors are far more complicated so it will not be perfect but it is an an entertaining method to see how our bodies respond to stress. This circuit uses differences in sweating to figure out whether someone is speaking the truth. People who are worried or […]
Simple RF Sensor without Battery Circuit
This article teaches how to construct a simple battery free tester for checking whether a radio transmitter is functional. The transmitters radio waves provide electricity to the tester which flashes an LED to indicate if it is working. What is a RF Sensor without Battery: An RF sensor without a battery is a wireless sensor […]
Simple Metal Detector Circuit
A special technique is used in this article for designing a metal detector. It only uses a circuit design that is different from the others circuit and needs only one transistor. The circuit picks up signals reflected off metal using a regular radio. What is a Metal Detector: A metal detector is an electrical circuit […]
Simple Magnetic Field Sensor Circuit
Beginners who wish to learn about electronics are going to enjoy this post! It explains how to construct a simple circuit for a magnetic field sensor. Because they are simple to construct and provide a wide range of uses these circuits are well liked. In the exciting field of electronics they are a great place […]
Infrared (IR) Sensor Alarm Circuit using TSOP1738
This tutorial teaches how to construct a simple alarm system that detects intruders using invisible light beams. Because it uses infrared light this kind of alarm is known as an IR alarm. It generates an infrared light beam that travels across a room using an special chip known as an IC 555. The light is […]