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coil less fm transmeter
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sahu



Joined: 09 Oct 2009
Posts: 43
Helped: 3
Location: india
Post17 Oct 2009 18:43   

coil less fm transmeter
any body can prov. me ;coil less fm transmeter; or ;ic based fm transmeter; max 10 meter rang.
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Audioguru



Joined: 19 Jan 2008
Posts: 1144
Helped: 93
Location: Toronto area of Canada
Post17 Oct 2009 21:07   

Re: coil less fm transmeter
Here is an FM transmitter circuit that does not use any coils.
It uses a 10.7MHz crystal filter in an oscillator and is amplified by Cmos logic inverters so its output is many harmonics of 10.7MHz including its 9th harmonic at 96.3MHz in the middle of the FM broadcast band.

If the FM receiver is extremely sensitive then the range might be as far as 10m.

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sahu



Joined: 09 Oct 2009
Posts: 43
Helped: 3
Location: india
Post18 Oct 2009 15:51   

Re: coil less fm transmeter
Audioguru wrote:
Here is an FM transmitter circuit that does not use any coils.
It uses a 10.7MHz crystal filter in an oscillator and is amplified by Cmos logic inverters so its output is many harmonics of 10.7MHz including its 9th harmonic at 96.3MHz in the middle of the FM broadcast band.

If the FM receiver is extremely sensitive then the range might be as far as 10m.

are u test this ckt? it is perfect?
i was test it,but not perfect.
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rajudp



Joined: 27 May 2006
Posts: 238
Helped: 10
Location: India
Post18 Oct 2009 17:18   

coil less fm transmeter
the circuit was from advanced electronics projects in 1992. i tested the circuit and was working fine. the length of the aerial given is 73 cm for 96.3 MHz( 10.7 x 9 ),

do you have used all components with correct values

the author is having a PCB diagram also
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Post18 Oct 2009 17:18   

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Audioguru



Joined: 19 Jan 2008
Posts: 1144
Helped: 93
Location: Toronto area of Canada
Post19 Oct 2009 0:58   

Re: coil less fm transmeter
The circuit is garbage.
It has a very small range and does not transmit treble audio frequencies because it does not have pre-emphasis (treble frequencies boost) like FM radio stations have and all FM radios have the opposite.
It causes a lot of interference.
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sajal1975



Joined: 25 Mar 2005
Posts: 150
Helped: 3
Post27 Oct 2009 17:48   

Re: coil less fm transmeter
rc network can be deploy for the purpose.
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