This is a small circuit fm transmitter using transistor BF494 . The reach of the transmitter will depend a lot on this antenna, of the feeding of the circuit and of the place where will happen your operation.
With a feeding of 6 V (4 piles AA) and an antenna of about 40 cm of length, we can arrive to the 200 meters. With a smaller antenna, or in place with many structures of iron (flagstones) the reach will be sensibly reduced. A common wall without metallic structure is not obstacle for this transmitter.
Below the circuit schematic and Printed circuit board fo the fm transmitter
Parts List of the micro fm transmitter
Transistors:
Q1 - BC558
Q2 - BF494
Resistors:
R1--4,7 KΩ
R2--220 KΩ
R3--22 KΩ
R4--10 KΩ
R5--6,8 KΩ
R6--47 Ω
Capacitors:
C1--10 µF/16 V - ELECTROLYTIC
C2--4,7 µF/16 V - ELECTROLYTIC
C3--10 nF - ceramic
C4--4,7 pF - ceramic
C5--100 nF - ceramic
CV--trimmer from 3-30 to 5-50 pF
Other:
MIC--microphone of electret of two terminals
L1--Reel - to see text
S1--simple Switch
B1--3 to 6 V - 2 to 4 small piles
The--antenna - to see text Printed circuit board or bridge of terminals, box for assembly or hollow book, support for 2 or 4 small piles, threads, it welds, etc.
Source: Toni Eletronica
See more : Stereo FM Transmitter
With a feeding of 6 V (4 piles AA) and an antenna of about 40 cm of length, we can arrive to the 200 meters. With a smaller antenna, or in place with many structures of iron (flagstones) the reach will be sensibly reduced. A common wall without metallic structure is not obstacle for this transmitter.
Below the circuit schematic and Printed circuit board fo the fm transmitter
Parts List of the micro fm transmitter
Transistors:
Q1 - BC558
Q2 - BF494
Resistors:
R1--4,7 KΩ
R2--220 KΩ
R3--22 KΩ
R4--10 KΩ
R5--6,8 KΩ
R6--47 Ω
Capacitors:
C1--10 µF/16 V - ELECTROLYTIC
C2--4,7 µF/16 V - ELECTROLYTIC
C3--10 nF - ceramic
C4--4,7 pF - ceramic
C5--100 nF - ceramic
CV--trimmer from 3-30 to 5-50 pF
Other:
MIC--microphone of electret of two terminals
L1--Reel - to see text
S1--simple Switch
B1--3 to 6 V - 2 to 4 small piles
The--antenna - to see text Printed circuit board or bridge of terminals, box for assembly or hollow book, support for 2 or 4 small piles, threads, it welds, etc.
Source: Toni Eletronica
See more : Stereo FM Transmitter
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