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 […]
Booster Circuit for Cable Radio
Anyone having problem getting radio signal from cable? Maybe this post for Booster Circuit for Cable Radio can help which is also called cable radio amplifier. This thing make signal strong when going through cable. Cable company give many channels but sometimes signal is not good because of too much distance or interference. Because of […]
Clap Switch Circuit using Speaker as MIC
In this article with one clap we can make a Clap Switch Circuit using Speaker as MIC. It can turn something ON or OFF! We use normal speaker like microphone which hear the clap sound and then turn switch ON or OFF. Only hand sound controls light or toy. This is fun and interesting project […]