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Home Projects RF circuits 4W FM Transmitter

 

 

4W FM Transmitter

source: Kyriakos Kontakos

 

TECHNICAL CHARACTERISTICS:

Stabilised tendency of catering: Vcc=12~16V

Frequency of emission: 88~108MHz

Consumption: 100~400mA

Materially:

The resistors are 1/4W.

R1, R2

10KOhm

R3

47Ohm

C1, C2

1nF

C3

4,7uF/16V

C4, C7, C8

0~45pF trimmer

C5, C6

10pF

C9

100nF

L1

4 turns, 7mm diameter *

L3

3 turns, 7mm diameter *

L4

5 turns, 7mm diameter *

L2

RFC (resistance 1MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resistance making thus a parallel L-r circuit.)

T1, T2

2N2219

ANT

Simple dipole l/2.

MIC IN

Microphone dynamic or other type. (It can also connected to a cassette player unit)

* The inductors is air from wire of coaxial 75W or other 1mm roughly.

 

PCB:

 Before you print it out with microsoft paints, set the screen resolution to 1280 by 1024 in order to get the correct scale 

 

Regulations:

With the C4 we regulate the frequency.

With their C7, C8 we adapt the resistance of aerial (practically to them we regulate so that it is heard our voice in the radio as long as you become cleaner).

Notes:

The T2 wants refrigerator.

Also check the conversation about this project at the community. Post you questions here.

 

 
 

 
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