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Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not be used as a room or telephone bug.
PC Board Layout and Parts Placement
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|Is this FM transmitter available in kit form with all the part and PWB?
|Thank you for this great circuit. I've tried it back in 2001 and it's just worked perfect. I've searched for the website and was so glad that it's still up and running. I made a post on my blog and an instructable. http://idea-arabic.blogspot.com.eg/2015/11/fm-transmitter.html
|Hi! I'd like to use the transmitter for remote switching.How to replace mic to send a switching pulse? I'm a teacher in the high school & I'd like very much to put forward this project for the annual competition for my students. Thank you Sir! Ashok.
|Can you please tell me how to make a reciever of the same frequency as this tranmitter.
|KN2222A looks like the 2N3904, soo i think that yes you can use that
|this transmitter needs stable voltage, any voltage trop or rise changes the frequency
|please help me about this circuit,can i replace mic by audio jack ?????
|I builded that transmitter to that PCB layout seen on that page. That little transmitter is very unstable, it drift 89.100 to 89.329, 229khz in 5mins! And FM deviation iss very slow, only about 5khz. So after that I builded smaller versio of that using junk SMD parts and with little modifications. I get it stability to 50khz/5min and deviation to allmost 100khz.
|what is BS170? is this transistor and how this fm transmiter give best result?
|How were the values of the FM transmitter determined?
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