This is High Power FM Transmitter Circuit and can be transmit signals up to 750 meters through FM frequency. Try to maintain the terminals of component as close as possible. You must be use PCB (Printed Circuit Board) for get best results. For power source, you can use 12V battery capable of delivering 500mA current or 12V/500mA DC Power Adepter. You can self make L1 coil using 18 SWG (Standard Wire Gauge) or 16 AWG (American Wire Gauge) enameled copper wire and wind up 7 turns maintaining its internal diameter as a 10mm. Keep distance of two windings between 12mm – 15mm, by shifting this, you can change transmission frequency. Use telescopic antenna as an antenna. Please, don’t operate this transmitter without connecting antenna. Install proper heatsink with Q1 Transistor. It generates some heat. Give audio signal to input via good pre-amp for best result.
Jun 3, 2011 ||