This post shows you a special way to build a metal detector. It uses a circuit design that is different from most and only needs one transistor. The circuit works with a regular radio to pick up signals that bounce off metal. What is a Metal Detector: A metal detector is an electronic circuit designed […]
Sensors and Detectors
Simple Magnetic Field Sensor Circuit
This article is perfect for beginners who want to learn about electronics! It shows you how to build a simple magnetic field sensor circuit. These circuits are popular because they are easy to make and there are many things you can do with them. They are a great way to get started in the exciting […]
Infared (IR) Sensor Alarm Circuit using TSOP1738
This guide shows you how to build a basic alarm system that uses invisible light beams to detect intruders. This type of alarm is called an IR alarm because it uses infrared light. It uses a special chip called a IC 555 to create a beam of infrared light that goes across a room. If […]
Simple Sound Activated Relay Circuit
This article shows you how to build a circuit that can turn things on and off with sound. It uses a special part called a relay to control things that use more power, like lights or motors. This could be useful for things like: We will show you exactly how to build it and how […]
Simple Non Contact AC Mains Voltage Detector Circuit
Electricity powers our world, but it can also be dangerous. This post shows you how to build a handy tool that can detect live wires without touching them. This is a great safety tool for people who work around electricity, but also for anyone who wants to be careful at home. WARNING: Even with this […]
Simple Soil Dryness Detector Circuit
Plants need water to grow healthy and strong, just like people do! It can be tricky to know when to water your plants, though. This article shows you how to build a soil moisture sensor. This device will tell you when your soil is dry and needs watering. The guide even includes some easy to […]