wireless speakers - Electronic Circuits Projects Diagrams Free

neoandrewson · 20th April 2008, 01:11 PM

hi people,

i had an idea to implement a wireless speaker system. i thought of routing the line out signal of any system (ipod, pc) to a circuit consisting of adc, and then routing it to wireless usb. on the other side, another wireless usb and a dac given to line in of speaker.. will this idea work? what are the other parameters i need to consider?

**Nigel Goodwin** · 20th April 2008, 01:31 PM

No it won't, you forgot the computer at each end between the wireless USB and the ADC/DAC.

Funny NYPD · 20th April 2008, 01:39 PM

What about the power to your speaker? Are you planning on batteries or shore-power?

neoandrewson · 20th April 2008, 02:31 PM

i thought of powering by batteries. and why do we need a computer at both ends? the output of the line out will be directly fed to adc, that will be routed to wireless usb. same at the reciever. i thought of using cypress proc as wireless usb.

**Nigel Goodwin** · 20th April 2008, 03:34 PM

Quote:

Originally Posted by neoandrewson

i thought of powering by batteries. and why do we need a computer at both ends? the output of the line out will be directly fed to adc, that will be routed to wireless usb. same at the reciever. i thought of using cypress proc as wireless usb.

As long as you can do all the required processing then you will be fine, but essentially it's then a computer - with you writing all the OS and USB host stuff.

Papabravo · 20th April 2008, 04:32 PM

I'd recommend using 24 bit DACs like the TI(Burr Brown) PCM1704

http://focus.ti.com/lit/ds/symlink/pcm1704.pdf

Prices should be coming down as the high end audio folks move to 192kHz and 384 kHz. Think you have the stones for it?

BTW Nigel is right you need a computer at both ends. I guess you have a choice of using one or two computers on the transmitting end and you need a computer at each speaker. I suppose you might be able to do a couple of mega FPGAs with DSP cores but that still ranks as a computer in my book.

neoandrewson · 20th April 2008, 05:03 PM

hi all,

thanks a lot for the reply. i'm studyin undergraduate. so thought of doin a project with wireless speakers using this chip.

actually i thought it would be lot simpler. now i realized it would take two sound card at both ends!

but i'm curious how wireless speakers are implemented using bluetooth? do they use the same analogy?

attached is the idea how i had visualized..

Glyph · 20th April 2008, 05:05 PM

A way to implement wireless speakers is to hook up each speaker to small FM radios, and then hook up your audio device to an FM transmitter. Both are sold for dirt cheap prices and are very small. In fact i'm running a similar setup right now.

In know this takes away the fun and learning experience of building it yourself but if you're more interested in the product than the process then i suggest going this route as its much faster and considerably cheaper.

neoandrewson · 21st April 2008, 01:03 AM

hi,

thanx for the replies.. can you suggest some fm transmitters and recievers? what range and quality can i get?

Glyph · 21st April 2008, 01:24 AM

Type "Fm transmitter" into ebay and you'll get thousands of hits. The one i'm using i bought from here http://www.directcanada.com/products...facture=BELKIN

Audio quality of that particular one isn't all that great so i'm probably going to change that sometime.

The radios can be any FM receiver that you can tune. i got a couple of mini-FM receivers and tuned them to receive at the frequency of the transmitter.

As the old saying goes: you get what you pay for. My setup cost $60 total for the transmitter and receivers but the sound quality that comes out reflects that.

You're still better off with wired speakers if you want the best quality.

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20th April 2008, 01:11 PM	(permalink)
neoandrewson	wireless speakers hi people, i had an idea to implement a wireless speaker system. i thought of routing the line out signal of any system (ipod, pc) to a circuit consisting of adc, and then routing it to wireless usb. on the other side, another wireless usb and a dac given to line in of speaker.. will this idea work? what are the other parameters i need to consider?

20th April 2008, 01:31 PM	(permalink)
Nigel Goodwin	No it won't, you forgot the computer at each end between the wireless USB and the ADC/DAC. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

20th April 2008, 01:39 PM	(permalink)
Funny NYPD	What about the power to your speaker? Are you planning on batteries or shore-power? __________________ F.N.

20th April 2008, 02:31 PM	(permalink)
neoandrewson	i thought of powering by batteries. and why do we need a computer at both ends? the output of the line out will be directly fed to adc, that will be routed to wireless usb. same at the reciever. i thought of using cypress proc as wireless usb.

20th April 2008, 04:32 PM	(permalink)
Papabravo	I'd recommend using 24 bit DACs like the TI(Burr Brown) PCM1704 http://focus.ti.com/lit/ds/symlink/pcm1704.pdf Prices should be coming down as the high end audio folks move to 192kHz and 384 kHz. Think you have the stones for it? BTW Nigel is right you need a computer at both ends. I guess you have a choice of using one or two computers on the transmitting end and you need a computer at each speaker. I suppose you might be able to do a couple of mega FPGAs with DSP cores but that still ranks as a computer in my book. __________________ We never have time to do it right; but we always have time to do it over. Last edited by Papabravo; 20th April 2008 at 04:36 PM.

20th April 2008, 05:05 PM	(permalink)
Glyph	A way to implement wireless speakers is to hook up each speaker to small FM radios, and then hook up your audio device to an FM transmitter. Both are sold for dirt cheap prices and are very small. In fact i'm running a similar setup right now. In know this takes away the fun and learning experience of building it yourself but if you're more interested in the product than the process then i suggest going this route as its much faster and considerably cheaper.

21st April 2008, 01:03 AM	(permalink)
neoandrewson	hi, thanx for the replies.. can you suggest some fm transmitters and recievers? what range and quality can i get?

21st April 2008, 01:24 AM	(permalink)
Glyph	Type "Fm transmitter" into ebay and you'll get thousands of hits. The one i'm using i bought from here http://www.directcanada.com/products...facture=BELKIN Audio quality of that particular one isn't all that great so i'm probably going to change that sometime. The radios can be any FM receiver that you can tune. i got a couple of mini-FM receivers and tuned them to receive at the frequency of the transmitter. As the old saying goes: you get what you pay for. My setup cost $60 total for the transmitter and receivers but the sound quality that comes out reflects that. You're still better off with wired speakers if you want the best quality.