Tuesday, July 20, 2010

Make a FM Booster

There is a low-cost circuit of an FM booster which can be used to listen programmes from high distant FM stations clearly.
The circuit comprises a common-emitter tuned RF preamplifier wired around VHF or UHF transistor 2SC2570. (Only C2570 is annotated on the transistor body.)




Parts List:
R1 ---------------------------------- 27K
R2 ---------------------------------- 270K
R3 ---------------------------------- 1K
C1 ---------------------------------- 5.6p
C2 ---------------------------------- 5.6p
C3 ---------------------------------- 1n
C4 ---------------------------------- 10p
C5 ---------------------------------- 10p
C6 ---------------------------------- 0.1micro
VC1 -------------------------------- 22p
VC2 -------------------------------- 22p
T1 ----------------------------------- C2570
L1 ----------------------------------- 20SWG ( 4 Turns ; 5mm diameter)
L2 ----------------------------------- 20SWG ( 3 turns ; 5mm diameter)

Sourch