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Coilless FM transmitter


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۞ TPS ۞

Wed Jan 02 2008, 10:15AM

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The RF oscillator using the inverter N2 and 10.7Mhz ceramic filter is driving the parallel combination of N4 to N6 through N3.Since these inverters are in parallel the output impedance will be low so that it can directly drive an aerial of 1/4th wavelength. Since the output of N4-N6 is square wave there will be a lot of harmonics in it. The 9th harmonics of 10.7Mhz (96.3Mhz) will hence be at the center of the FM band .
N1 is working as an audio amplifier. The audio signals from the microphone are amplified and fed to the varycap diode. The signal varies the capacitance of the varycap and hence varies the oscillator frequency which produce Frequency Modulation.

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Coilless FM Transmitter FM transmitter circuit no coil FM transmitter with no coil 96.3Mhz FM transmitter no coil

Ajay

Wed Jan 02 2008, 12:38PM

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nice clever design

wow..

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ADG3699

Sun Jan 06 2008, 05:27AM

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guys can someone pleeeeasssssseee send me an e-mail to help me out. I really am desperate to build FM Transmitters 9V. I have plans but I am not very good at matching circuit plans to what should go where on boards. If anyone has photos of any sort for FM TRansmitters please be kind enought o e-mail me at NORRIE3699@HOTMAIL.COM I'd really appreciate it. I've tried to buy kits from America but they do not sell to the UK which is unfair.

I am also well into making money and have my own site forum www.money-ideas-forum.com It has just started hence the low number of registered users. Please come along and join in the money making help !

Ajay

Sun Jan 06 2008, 05:51AM

Rickey's World Admin

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Joined: Fri Feb 24 2006, 04:56AM

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well try to make them yourself.. they are easy just need little time and paitence...
there is no need to provide email because we do not email anyone..whatever is there.. just post here