How to transmit music from PC to music system wirelessly...??

[chi_visor]

Plz help me with this.....i want to transmit da music from pc to my music system wirelessly.....any idea how i should go about it??? I also want stereo tranmission....Plz suggest circuit ideas or IC's that can be used for this purpose......

 

[Bassanova]

Have you checked out the RF section in the avalible projects?

 

[audioguru2]

The Micromitter FM stereo transmitter circuit is used by many manufacturers of MP3 to car radio converters and they work very well. The Micromitter has an attenuator on its output to reduce its range to be legal in Australia. It is easy to remove the attenuator. Here are some links:
http://electronics-diy.com/schematics/BH1417_fm_transmitter.htm
http://electronics-diy.com/BH1417_PLL_Stereo_FM_Transmitter.php

 

[chi_visor]

thnx for ur replies guys.....
Audioguru ive already chkd it but the problem is im in India and that chip is not available here....even after a lot of search i cudnt find any other chip which transmits stereo Fm.....
Can u tell me if theres any other chip available or a circuit that  i can make which can transmit stereo FM..??

 

[audioguru2]

The BH1417 first came out in about 2001 or 2002 to replace the BA1404 that worked very poorly. There are still many kits available that have the old BA1404.

Buy an MP3 to car radio transmitter. I have seen them in stores and they are not expensive. The good ones use a BH1417 IC and have the DIP switches to select an RF frequency.

Move to a country that has anything you need.

 

[Sukhbinder]

Hi chi_visor, where do you put up in INDIA? I also live in INDIA. i'm putting up in New Delhi. As audioguru suggested it would be better to buy a MP3 to radio transmitter. i got one for myself from Lajpat Rai Market for Rs450/-. it uses a single  AAA cell for the power supply and has a stereo pin as the input. just plug it in the headphones jack of your PC or any other player and you have 4 different frequency setting to chose the transmitter frequency. just tune in your music system's tuner at FM band to the frequency and enjoy the music. i checked it and it transmits in stereo. I opened it to check the components and it used just 2 ICs from NJRC (don't remember the numbers now). its the most simple way to connect and MP3 player to any system. by the way i got this from a car audio dealer, great to hear MP3 music on your old car audio.... ;D

 

[AN920]

The RF power direct out from the BH1417 is low typically about 100dBuV or about -7dBm (0.2mW). The output impedance is 75Ohm and not 50Ohm as one will expect with most RF systems.

View attachment 40129

 

[audioguru2]

I didn't know the BH1417 has flea-powered output. I have never heard of anybody reporting its range.

 

[AN920]

I read somewhere on a FCC page that the legal limit (88-108) in the US is something ridiculously like 15nW?? Enough to transmit 10'

 

[audioguru2]

I just finished reading reviews about the Ramsey Veronica and The Broadcast Warehouse 1W FM transmitter kits and they do actually produce more than 1W into an antenna.

People are making them and using them. I wonder where and wonder if they get caught.

 

[AN920]

They do get caught, more quickly if they cause interference or there's a complaint. On the FCC page there is a massive list of all the instances of people caught or warned.
http://www.fcc.gov/eb/FieldNotices/
Ramsey was also fined many $1000's for selling high power (1W) transmitters. The FCC seems not to worry about their 25mW (FM25B)version.

 

[audioguru2]

Hi AN920,
In your list of FCC violations:
1) A tow truck company moved and didn't tell the FCC. Their new location caused interference with a competitor's radio system.
2) A TV station was caught with the top red light on their tall antenna burned out.

Somebody on one of these forms built my FM transmitter circuit and reported seeing the van with the "TV" antenna on top slowly going down his street the day after he tested his transmitter. He nearly got caught.

When I was young the Feds caught me with a badly sparking fan. We had a nice chat then the people who complained about TV interference bought me a new fan. ;D

 

[AN920]

Anything to make the budget work will do! One guy refused to answer the door when they visited him and was fined $10000 for transmitting on 103MHz over the power limit.

 

[chi_visor]

thanks a lot guys.....i liked da idea of mp3 to car radio transmitter n i think ill go for tat till BH1417 is available here...!!

 

[audioguru2]

Buy an MP3 to car radio transmitter. If it is stereo and is good, then it will have da BH1417 IC in it.