4W FM Transmitter
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.
Title: 4W FM Transmitter
electronic circuit
Source: www.electronics-lab.com
Published on: 2005-02-03
Reads: 2803
Print version: 
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