FM MIC CIRCUIT

 참고 : http://homemadecircuitsandschematics.blogspot.kr/2011/12/fm-wireless-microphone-circuit-design.html

 

주파수변조(AM,FM,PM) 강좌           FM 라디오 만들기          FM MIC CIRCUIT          One tr FM transmitter          심플한 FM 라디오 회로 OP AMP용

 

 

 

 

 

3V FM Transmitter Circuit

This project provides the schematic and the parts list needed to construct a 3V FM Transmitter. This FM transmitter is about the simplest and most basic transmitter to build and have a useful transmitting range. It is surprisingly powerful despite its small component count and 3V operating voltage. It will easily penetrate over three floors of an apartment building and go over 300 meters in the open air.

It may be tuned anywhere in the FM band. Or it may be tuned outside the commercial M band for greater privacy. (Of course this means you must modify your FM radio to be able to receive the transmission or have a broad-band FM receiver.) The output power of this FM transmitter is below the legal limits of many countries (eg, USA and Australia). However, some countries may ban ALL wireless transmissions without a licence. It is the responsibility of the constructor to check the legal requirements for the operation of this kit and to obey them.

PARTS LIST
R1	22KΩ
R2	10KΩ
R3	47KΩ
R4	1MΩ
R5	470Ω
C1	22n (223) ceramic
C2	100n monoblock
C3	1n (102) ceramic
C4	5.6p ceramic
C5	27p ceramic
C6	22n (223)
VC1	Trim Cap 6-45 pF
Q1	BC547
Q1	BC547
L1	5 turn coil
MIC	Electret microphone
AERIAL	Aerial Wire 165cm
BT1	3-5V (2 AA Battery holder)