3-12V GSM Mobile Phone Signal Flashlight DIY Kit Electronic Circuit Training Suite

Instructions phone calls lights Phone calls phone calls lights kit can be used to sense the GSM signal display sensing distance up to 1 m is a very interesting DIY module Electrical characteristics Supply voltage 3 to 12VSensing distance about 1 mPCB board size 2 2cm 2 8cmScope GSM mobile phone signal for CDMA phones are uselessNote This is a DIY kit you need to assemble it The circuit theory The main circuit is amplified antenna sensor signal circuit and circuit Sensing signal through the antenna 3 to S8050 transistor amplifier to drive the LED so that light up When no signal is detected no calls or no GSM phones LED circuit is not only detects the signal to light up LED Inductance of production Inductance 0 25 to 0 5MM enameled available in pen core above can be around 5 10 laps After a good round with a blade to scrape paint inductor 2 so we go soldered to the board