No more boring ding dong bell! This Touch Controlled Musical Door Bell Circuit show how to make doorbell which play small music tune; just press a button and it rings a melody sound which we can choose which one. Also, this circuit is fun idea to make door more special and different. Circuit Working: Parts […]
Hobby Circuits
Mobile Phone Detector Circuit using Op-Amp
To begin with, in this Mobile Phone Detector Circuit using Op-Amp we will show how to make one circuit to detect mobile phones nearby. The circuit detects radio signals from an active mobile phone, helping to identify unauthorized phone usage in quiet places like meeting rooms and libraries. However, always check local rules and regulations […]
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. Also, this type of device is called a bug or transmitter because it can spy on peoples conversations, so people should not use it for illegal or unethical purposes. […]
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
To begin with, this Simple Siren Circuit article show how to make circuit sound like real siren! here, the sound goes up and down fast like police car or ambulance siren. Also, building this type of circuit is fun, but remember that people use sirens during emergencies. Circuit Working: Parts List: Components Values Quantity Resistors […]
Booster Circuit for Cable Radio
Anyone having problem getting radio signal from cable? then maybe this post for Booster Circuit for Cable Radio can help which is also called cable radio amplifier. Moreover, this thing make signal strong when going through cable, as cable company give many channels but sometimes signal is not good because of too much distance or […]