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FM Booster~Active FM Antenna Amplifier

2015-01-05 13:40  
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FM Booster


FM Booster, Active FM Antenna Amplifier

This FM booster that can be used to listen to programmes from distant FM stations clearly. The circuit comprises a common-emitter tuned RF preamplifier wired around VHF/UHF transistor 2SC2570. (Only C2570 is annotated on the transistor body.)

FM Booster Active FM Antenna Amplifier circuit

PARTS LIST
R127kΩ
R2270Ω
R31kΩ
C15.6pF
C25.6pF
C31n
C410pF
C510pF
C60.1μF
VC122pF Trimmer capacitor
VC222pF Trimmer capacitor
L14T, 20 SWG 5mm DIA, AIR CORE TAPED AT 1T FROM BOTTOM END
L23T, 20SWG 5mm DIA, AIR CORE
T12SC2570

Assemble the circuit on a good-quality PCB (preferably, glass-epoxy).

Adjust input/ output trimmers (VC1/VC2) for maximum gain.

Input coil L1 consists of four turns of 20SWG enamelled copper wire (slightly space wound) over 5mm diameter former. It is tapped at the first turn from ground lead side. Coil L2 is similar to L1, but has only three turns.

2sc2570 c2570 npn silicon high frequency transistor

Pin configuration of transistor 2SC2570


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