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QUALITY FM TRANSMITTER
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Short Description: QUALITY FM TRANSMITTER. TAPAN KUMAR MAHARANA. T his FM transmitter for your stereo or any other amplifier provides a good signal strength up to a dis- ...
Content Inside: C I R C U I T I D E A S QUALITY FM TRANSMITTER SUNIL KUMAR TAPAN KUMAR MAHARANA For frequency stability, use a regulated L1: 5 turns of 24 SWG wire closely DC power supply and house the transmit- wound over a 5mm dia. air core This FM transmitter for your stereo ter inside a metallic cabinet. For higher L2: 2 turns of 24 SWG wire closely or any other amplifier provides a antenna gain, use a telescopic antenna in wound over the 5mm dia. air core good signal strength up to a dis- place of the simple wire. Coils L1 and L2 L3: 7 turns of 24 SWG wire closely tance of 500 metres with a power output of about 200 mW. It works off a 9V battery. The audio-frequency modula- tion stage is built around transis- tor BF494 (T1), which is wired as a VHF oscillator and modu- lates the audio signal present at the base. Using preset VR1, you can adjust the audio signal level. The VHF frequency is decided by coil L1 and variable capacitor VC1. Reduce the value of VR2 to have a greater power output. The next stage is built around transistor BC548 (T2), which serves as a Class-A power ampli- fier. This stage is inductively coupled to the audio-frequency modulation stage. The antenna matching network consists of variable capacitor VC2 and capacitor C9. are to be wound over the same air core wound over a 4mm dia. air core Adjust VC2 for the maximum transmis- such that windings for coil L2 start from L4: 5 turns of 28 SWG wire on an sion of power or signal strength at the the end point for coil L1. Coil winding intermediate-frequency transmitter (IFT) receiver. details are given below: ferrite core AUGUST 2004 ELECTRONICS FOR YOU
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