This is a basic and fascinating project of a cell phone signal-activated LED circuit. Basically, the circuit will light up an LED when you call from your mobile phone or receive a phone call. Moreover, the LED will illuminate the electromagnetic waves of your phone subsequently it doesn’t require any battery power. Besides, it is likewise useful in identifying the quality and strength of mobile phone signals during phone calls.
However, this circuit is fabricated by utilizing two 1N34 germanium diodes, one LED, and a 10-centimeter antenna only.
Hardware Components
Circuit Diagram
Circuit Operation
Accordingly, the working of the circuit is extremely basic. The circuit operates in such a way that when the two germanium diodes 1N34 get an RF signal through the antenna which is attached to the mobile phone, then these germanium diodes convert this electromagnetic signal into DC current and this DC current makes the LED bright up.
The circuit is utilizing two 1N34 germanium diodes. You can likewise utilize other comparable diodes yet ensure they are germanium. In light of the fact that these diodes function admirably for RF signal detection. Similarly, utilize any small powered 20mA to 25mA LED of any shading. However, On the off chance that you are making the circuit on Vero board or some other PCB make a point to fit the segments as close and conceivable and furthermore make the leads of the parts as short as could reasonably be expected. Similarly, the antenna can be a little wire of 10 centimeters.
Applications and Uses
- The circuit likewise utilizes in glimmering a LED light while any incoming or outgoing phone call rings.
- It recognizes electromagnetic waves around the mobile phone while ringing or interfacing with the server.
- It can likewise assist with recognizing the quality and strength of mobile network signals while calling.
