FM Transmitter for 88 - 108 MHz

_ coax cable. 50/75Ω. 5D2V[RG8]. +_. 22KΩ. (4 x 10-12 x 0.1cm). 30V(vcbo). 2V(vebo). 0.05A(Ic). 0.3W(Pc). 40V(vcb0). 4V(vebo). 0.4A(Ic). 0.7W(Pc). 40V (vcb0).
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FM Transmitter for 88 - 108 MHz 12-14volts DC power in + _

Coil A (to change frequency) = 8.5 turns Coil B/C (to adjust matching) = 3.5 turns 0.01µF

0.01µF

0.01µF

copal plated board (4 x 10-12 x 0.1cm) 51Ω 10PF audio in + _

1-4.7µF

4.7µH RFC

10PF

22KΩ

33PF

C

B

_+

2SC1907 E 10PF

Coil B

1µH RFC

10PF

10PF

B 33PF

27KΩ 100PF

B C

Coil C

+ _

C 33PF

2SC1970 3.5PF E 33PF E 2-3µH 1KΩ 300Ω 4.7KΩ Coil A RFC 2SC2538

variable capacitance diode 2volts--->20-30pF

2SC1907

2SC2538 or 2SC2053

out to antenna

2SC1970

100PF

coax cable 50/75Ω 5D2V[RG8]

soldered point: : direct to the ground

E Maximum standards:

C

B

30V(vcbo) 2V(vebo) 0.05A(Ic) 0.3W(Pc)

B

C

E

40V(vcb0) 4V(vebo) 0.4A(Ic) 0.7W(Pc)

B C E 40V (vcb0) 4V(vebo) 0.6A(Ic) 5W(Pc)

: insulated from the ground

2005-03-27 tetsuo kogawa