AM/FM Antenna Booster Circuit Diagram
Simple Electronic Applications February 2nd, 2010This antenna booster circuit can be used to amplify the weak signal received by the antenna. Antenna for AM/FM is usually not tuned for the optimal dimension of 1/4 wavelength, since we prefer small portable size. This untuned antenna has very low gain, so the antenna booster circuit here is very helpful in getting better signal reception. Here is the schematic diagram of the circuit:
Use around 470uH coil for L1 if you use for AM frequency (700kHz-1.5MHz) and use around 20uH for SW or FM receiver. For short wave performance, using this antenna booster, you’ll get a strong signal as we get from a 20-30 feet antenna, with only a standard 18? telescopic antenna and this booster circuit. The power supply should be bypassed by a 47nF capacitor to ground, at a point that should be chosen as close as possible to L1.
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August 30th, 2010 at 9:15 pm
Can an AC power supply be used on this project? Also I am having trouble understand the power supply bipass? which wire should be connected via a 47nF capaciter to ground?
November 13th, 2010 at 10:57 am
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November 1st, 2011 at 4:48 am
HELLO SIR, ICANNOT FIND MPF 102 TRANSISTOR ,SO PLEASE GIVE ITS OTHER ALTERNATIVE VALUED TRANSISTOR.IF NOT POSSIBLE THEN PLEASE SEND ME A NEW SIMPLE CIRCUIT .I AM STAYING FAR AWAY FROM FM BROADCASTING STATION AND I DO NOT GET THE FM RECEPTION .SO PLEASE SEND ME A GOOD AND SIMPLE AND CHEAP CIRCUIT DIAGRAM. THANKING YOU. MR. DOMINGOS MENDES.