Technical specifications
Power supply: 12 V stab., 0,7 A
RF power: 3 W
Impedance: 50-75 ohm
Frequency range: 88-107 MHz
Modulation: wideband FM
Schematic diagram:
Parts list:
Capacitors:
C1 - 4,7 uF (electrolytic)
C2 - 0,22 uF (electrolytic)
C3, C4, C12 - 100 pF (ceramic)
C6, C9, C11, C13, C14, C19 - 1 nF (ceramic)
C7, C8 - 10 pF (ceramic)
C10 - 8.2 pF (ceramic)
C18 - 22 pF (ceramic)
C15 - trimmer 47 pF
C16, C17 - trimmer 60 pF
C20, C5 - 100 nF (ceramic)
C21 - 470 uF (electrolytic)
Coils:
(All coils are free-standing air-core types, wound of 0,7 mm Cu wire, 6 mm internal diameter.)
L1, L6 - 4,5 coils
L3 - 2,5 coils
L4 - 1,5 coils
L2 - 6,5 coils around R9 resistor
L5 - 9,5 coils
L7 - 3,5 coils
Resistors:
R1 - 10 k pot.
R2 - 4,7 k
R3, R4, R5, R8, R10 - 27 k
R6, R16 - 10 k
R7, R15 - 470
R9 - 100
R11 - 270
R12 - 1 k
R13 - 43
R14 - 10
Diodes:
D1, D2 - BB109G, BB409 or BBY31
Transistors:
T1 - BC547C (BC548C, BC547B)
T2 - BFR91A (BFR96)
T3 - BFR96S
T4 - 2SC1971
Pcb lay out up :
Pcb lay out bottom :
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