FM Booster~Active FM Antenna Amplifier

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
R1 27kΩ
R2 270Ω
R3 1kΩ
C1 5.6pF
C2 5.6pF
C3 1n
C4 10pF
C5 10pF
C6 0.1µF
VC1 22pF Trimmer capacitor
VC2 22pF Trimmer capacitor
L1 4T, 20 SWG 5mm DIA, AIR CORE TAPED AT 1T FROM BOTTOM END
L2 3T, 20SWG 5mm DIA, AIR CORE
T1 2SC2570

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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