This is a low cost and easy build low powered FM transmitter. The range of the FM transmitter claimed about 300 feets when running at 9V supply. And the range claimed to be increased become about 400 feet when running it at 12V supply. Take a note that this transmitter should not be used as a room or telephone bug.
Components List:
C1 = 1nF
C2 = 5.6pF
C3,C4 = 10uF/16V
C5 = 3-18pF Varco/Varicap
R1 = 270 Ohm 1/4W
R2,R5,R6 = 4.7K 1/4W
R3 = 10K 1/4W
R4 = 100K 1/4W
Q1, Q2 = 2N2222A or 2N3904 or NTE123A
L1, L2 = 5 Turn Air Core Coil
MIC = Electret Microphone
MISC : 9V Battery Snap, PC Board, Wire For Antenna
PCB Design:
Easy build FM transmitter circuit source: http://www.aaroncake.net/circuits/fmtrans.asp
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its nice mathode.....
How do i set the transmitter coz it is not picking on the fm radio that am using..can someone help me out???????????????
Super simple tx.. Wireless mic