Schematics > RF circuit > 4W FM Transmitter
4W FM TransmitterTECHNICAL 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.
Title: 4W FM Transmitter
Source: www.electronics-lab.com
Published on: 2005-02-03
Reads: 1062
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