This circuit shows how to construct an intelligent lead acid automobile battery charger! With this charger users do not have to worry about overcharging the battery because it automatically stops charging it when it is full. This is useful for devices that use automobile batteries such as UPS backup power supplies. Circuit Working: Parts List: […]
Simple Thunder Lightning Detector Circuit
This circuit explains how to construct a lightning detector a tool which is used by storm chasers! A special kind of energy is created in the sky by lightning. When a storm occurs this circuit detects the electricity and alert users by lighting up or emitting a sound. As a result one can get more […]
Simple Mobile Phone Detector Circuit using Op-Amp
Here is how to construct a circuit that can detect mobile phones in the area. It can detect the invisible radio signals that cell phones produce when they are turned ON and alert them if someone is using a phone in private places like a conference room or a library where they should not be. One […]
Simple Spy Phone Bug Transmitter Circuit
The circuit for a spy phone bug transmitter is a secret listening device. It has the ability to track and record phone conversations without the callers being aware of it. These devices are referred to as transmitters or bugs. Because these devices spy on peoples private conversations using them is wrong. Also this type of […]
Simple Low Battery Indicator Circuit using Two Transistors
This article discusses how to construct a small assistance circuit for the battery powered devices. When the battery is running low it uses only a few components including two transistors to light up an LED. In this way it will be able decide when to change the battery before the device goes out. Circuit Diagram: […]
Simple Siren Circuit
Building a circuit that sounds like a real siren is made clear in this Simple Siren Circuit article! Similar to the siren of a police car or ambulance the sound rapidly rises and falls in pitch. Although this activity can be enjoyable keep in mind that sirens are also used in emergency situations. Circuit Working: […]