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Four-Stage FM Transmitter

Four-Stage FM Transmitter

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COM

IC1

7809

3

1

IN

2

OUT

L1-L5 = REFER TEXT

COND.

MIC

C3

1n

R4

2.2K

R5

68Ω

C4

8.2P

VC2

22P

C5

0.1μ

L1

VC1

22P

C2

0.01μ

R3

22K

R1

10K

OSCILLATOR

PRE AMP

DRIVER

POWER AMP

C8

1n

R7

18Ω

R8

2.2K

T3

2N2219

(2N5209)

T2

BF200

SH

C6

0.1μ

R6

68K

VC3

22P

L2

C7

1n

L3

C9

1n

VC5

22P

T4

2N3866

R9

1K

VC7

40P

T2 = BFW 16A USED DURING TESTING

L5

L4

VC6

40P


50Ω

LOAD

ANTENNA

+12V

C1

2.2μ

25V

R2

1K

T1

BF494

C10

0.01μ

C11

100μ

25V

GND

VC4

22P

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Four-Stage FM Transmitter

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publish time: 2020-09-28
Circuit Everyday

This FM transmitter circuit uses four RF stages: a preamplifier built around the transistor BF494 (T1) and transistor BF200 (T2), and a power amplifier built around the driver transistor 2N2219 (T3) and transistor 2N3866 (T4). The condenser microphone is connected to the inlet of the oscillator.

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