4W调频发射电路图

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4W调频发射电路图

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.

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.