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FM Transmitters fm transmitters circuits, ideas and concepts

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  #1 (permalink)  
Old 04-22-2009, 03:28 PM
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Default Fm transmitter with 2N3866

Hi,

I want built a FM transmitter based on this shematic:

http://img16.imageshack.us/img16/48/trans001.gif

but I don't know how is the valor of C12 and R9 Can you help me?

I want start in FM world's....


Sorry, I'am portuguese

Thanks
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Old 04-23-2009, 06:50 AM
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C12 is 10 nanoFarads, R9 is not necessary. Actually first stage of that transmitter is not required, it is an audio amplifier for the mike.
You better use this 1 watt fm transmitter circuit with 2n3866 or 2n4427, or check this fm transmitter and fm transmitters sections.
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Old 04-23-2009, 05:44 PM
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Thanks... I will trie this circuit because I bought all component that I need...

When I finish it, I give you a review

Thanks
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Old 07-26-2009, 10:36 PM
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Join Date: Jul 2009
Location: Ankara
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Cool optimizing FM output power

Quote:
Originally Posted by serial_killer View Post
Hi...I want start in FM world's....
Years ago i built a 2 transistor FM transmitter similiar to this one. after trying several transistors for the end stage, i think i got about 4 watt at around of 22 volt instead of 12 volt only. i used a very big heat sink ( 20 cm x 20 cm square ) for the high frequency output power transistor. I possitioned it at the roof of our 9 floor high apartment with self a made 80cm vertical teleskopic dipole antenna. At the end i could listen my radios antenna about 5km in open area.

Good luck to everyone experiencing in this field.
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