Sunday, July 31, 2011

make mini FM transmitter

in this article we will discuss how to make a simple radio transmitter to transmit a distance of 400-500 meters. with power applied only 9 volts.

components needed:

C1 = 0.001uf
C2 = 5.6pf
C3, C4 = 10uF / 16V (ELCO)
C5 = 3-18pf (Adjustable Cap)
R1 = 270 Ohm 1/4W
R2, R5, R6 = 4.7K 1/4W
R3 = 10K 1/4W
R4 = 100K 1/4W
Q1, Q2 = 2N2222A (NPN Transistor) or 2N3904
L1, L2 = 5 Turn Air Core Coil
Electret microphone MIC =
9V Battery, PC Board, Wire For Antenna

for L1 and L2 using copper wire with a number of 5 turns.


The following schematics:



good luck

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