karthikeid Posted January 13, 2010 Author Report Share Posted January 13, 2010 how this circuit works can u explain audioguru ???will this be efficient?? Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 13, 2010 Report Share Posted January 13, 2010 how this circuit works can u explain audioguru ???will this be efficient??It is a garbage circuit that causes interference on many frequencies. It will barely work as an FM transmitter because its 9th harmonic (96.3MHz) is at a very low level.Its fundamental oscillator is at the 10.7MHz of the crystal filter. It is a squarish-wave with many harmonics and the 9th harmonic (96.3MHz) is in the FM broadcast band. Quote Link to comment Share on other sites More sharing options...
karthikeid Posted January 14, 2010 Author Report Share Posted January 14, 2010 i am really confused what to do, i need a stable fm transmitter circuit and it must be smaller in size.... someone pls help ??? Quote Link to comment Share on other sites More sharing options...
audioguru Posted January 14, 2010 Report Share Posted January 14, 2010 i am really confused what to do, i need a stable fm transmitter circuit and it must be smaller in size.... someone pls help ???The MAX2606 FM transmitter IC comes in a small surface-mount package. It operates at a low current from a low supply voltage so its range is only about 20m.Here is a project: http://electronicsprojects.mediadir.in/?p=1879It is missing pre-emphasis equalization so it will sound muffled (no treble frequencies) when heard on an FM radio. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted January 14, 2010 Report Share Posted January 14, 2010 It depends on what you're doing.How good does the transmitter need to be?Is it just a simple listening device which only needs to be telephone quality or is for a singer's mic. which needs to sound crystal clear?If all you want to do is build a simply listening device a simple two transistor FM transmitter will do. It doesn't need pre-emphasis or anything fancy.If it's a singer's mic. then you need a high quality amplifier with pre-emphasis.Either way the circuit originally posted is a bad idea because it will generate lots of interference on other radio bands. Quote Link to comment Share on other sites More sharing options...
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