To begin with, this Low Battery Indicator with Buzzer Circuit is very simple and uses basic idea and few parts. Buzzer make sound when battery is low and warn us and it help us to know when to change the battery so device do not stop suddenly. Circuit Working: Parts List: Components Values Quantity Resistors […]
Security and Protection
Mobile Phone Detector Circuit using Transistors
Imagine we have a spy device that finds nearby mobile phones. Mobile Phone Detector Circuit using Transistors is like ear for special signals phones send to towers; it can catch signal even before phone rings like secret talk between phone and tower. Also, it uses transistors, small switches to catch these signals. Circuit Working: Parts […]
Simple Gold Detector Circuit
This project is for Simple Gold Detector Circuit and it uses magnet and electric to find metal and even gold. Here, the electric goes fast back and forth and this make magnetic field in coil; and when metal come close then electric changes. Also, it is an fun project to learn about metal detector but […]
Simple DC High Low Voltage Cut Off Circuit
If our device need right DC power to work safe then this Simple DC High Low Voltage Cut Off Circuit work like a guard. Also, if battery is too low then circuit stop power to save our device and if battery is too high then also circuit stops power to protect. Hence, this circuit keep […]
Simplest Blown Fuse Indicator Circuit
This Simplest Blown Fuse Indicator Circuit shows if fuse is good or bad without checking it by hand; also if fuse is okay then green LED turns ON. Furthermore, if fuse blows then green LED goes OFF and red LED turns ON and that means fuse is bad and needs to change. Circuit Working: Parts […]
Simple Counterfeit Money Detector Circuit
Simple Counterfeit Money Detector Circuit is like smart light, it uses UV light to show secret mark on real note. Furthermore, it also uses magnetic sensor to feel the special ink and sometimes it uses IR light to see real money pattern. If the tool does not detect any special features, the note may be […]