This Automatic Lead Acid Battery Charger Circuit show how to make smart charger for car lead acid battery! With this charger no need to worry about overcharge. It will stop charging by itself when battery is full. It is good for things using car battery like UPS backup power. Circuit Working: Parts List: Category Item […]
Thunder Lightning Detector Circuit
This Thunder Lightning Detector Circuit teaches us how to make lightning detector, a tool used by storm chasers! Lightning makes special energy in sky. When storm come this circuit find that energy and give alert by light or sound. So person can go safe place before rain start. Circuit Working: Parts List: Category Item Quantity […]
Mobile Phone Detector Circuit using Op-Amp
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 […]
Spy Phone Bug Transmitter Circuit
This circuit for Spy Phone Bug Transmitter Circuit is like small secret listening thing. It can listen and record phone talk which people do not know. This type device is called bug or transmitter. It spy on people who talk, so using it is not a good idea. Also in some country this circuit maybe […]
Simple Low Battery Indicator Circuit using Two Transistors
This article for Simple Low Battery Indicator Circuit using Two Transistors tell how to make small circuit for battery device. When battery goes low it uses only few parts like two transistors to turn ON one LED light. So this way we can know when to change battery before device stop working. Circuit Diagram: Parts […]
Simple Siren Circuit
This Simple Siren Circuit article show how to make circuit sound like real siren! Sound goes up and down fast like police car or ambulance siren. Making this type of circuit is fun but remember siren are also used when emergency happens. Circuit Working: Parts List: Category Description Quantity Resistors 47k 1/4 watt 2 Capacitors […]