can we design low cost wireless speaker system?

[kaushik]

wire less music system that can be deployed in kitchen,living or others

a tab will play music
just we will plug speakers to power..speakers will have in built (Diy)amp+wireless link

wall speakers i can get in 2k

keeping costs low say 8k excluding tab...goal is to jest keep distortion free sound

can we design it...???

i am sure many people want it

of if there are ready options that fit the bill?

 

[sumeshj]

The easiest wireless option is bluetooth and the best part is that all phones/tablets support A2DP (music streaming over bluetooth). All you need is a bluetooth receiver, an amp and stereo speakers.

Check this out, it costs Rs.799 and is a Nokia OEM product:
New Nokia BH-214 Stereo Bluetooth Headphone (White Set) with 6 Months Warranty | eBay

I have tried this and it sounds reasonably good, atleast good enough for the kind of low budget setup you are looking for. The weak link here is the DAC inside the bluetooth receiver, but then we aren't looking for audiophile sound quality here.

This is how the setup would work: phone/tablet streams music over bluetooth, the bluetooth receiver receives it and feeds to an amp + speakers. If you can get speakers + amp under 2K as you said, then the whole setup would be just 2.8K!

Another solution (that I personally prefer) is the Logitech Wireless Boombox which sells for less than $100 in the US. It is basically a powered bluetooth speaker for playing music from phones/tablets. Excellent for carrying around the house (it has Li-Ion batteries inside) from room to room. I use it everyday to listen to internet radio playing from my phone/tablet. I even took it on a road trip sometime back and it played continuously for over 8 hours without recharge. Its an excellent product and sounds great!
Amazon.com: Logitech Bluetooth Wireless Speaker: MP3 Players & Accessories

 

[kaushik]

sumeshj, bluetooth is limited to 10 meters good for small room

2.4Ghz is way to go i need 3 low cost transceivers..1 as base and two inside speakers
other components can be managed

 

[saikatbiswas82]

sumeshj, bluetooth is limited to 10 meters good for small room

2.4Ghz is way to go i need 3 low cost transceivers..1 as base and two inside speakers
other components can be managed

@Koushik... You might be looking for this RF 2.4Ghz Serial Link [RKI-1197] - $19.04 : Robokits India, Easy to Use, Versatile Robotics Kits....

Robokits is quoting Rs 800 for each module. I believe if you look for the same in Chandni market, you can get a cheaper version.

I've used a 433mhz version of RF transmitter+receiver module for my pc controlled wireless robot and I do have faith on these components. These can give you good range (in terms of distance) as well. The only difference in your approach and my approach is ... I transmitted digital pulse over RF and you might be transmitting analog signal over RF. Both the things are possible with these kind of RF modules.

One more thing... this could be a good prototype as well.
I will try a wi-fi speaker module with my arduino+wifi shield very soon. I might need your help there.

 

[kaushik]

saikat,

sending bits in rf link is easy, audio in analog cant be sent.
i knw that ADC /DAC can be added,that will make it college boys project.

we can act smart i.e to get proper Hw piece..
rf link with 'audio in' is the thing we need

a thing like this http://www.amazon.co.uk/Audiomate-3...7?s=electronics&ie=UTF8&qid=1348480003&sr=1-7

at lower cost will be needed

 

[sumeshj]

sumeshj, bluetooth is limited to 10 meters good for small room

2.4Ghz is way to go i need 3 low cost transceivers..1 as base and two inside speakers
other components can be managed

If it is range that you are looking for, then 2.4 GHz won't give it easily. Even bluetooth is 2.4 GHz and works reliably till only about 10m. However if you transmit analog data over 2.4 GHz you may get slightly more range but with increased static (like those 2.4 GHz cordless phones).

For more range you need to either get more powerful transmitters or get into lower frequencies, such as FM (~100 MHz). A FM transmitter may be the solution for you.

@Koushik... You might be looking for this RF 2.4Ghz Serial Link [RKI-1197] - $19.04 : Robokits India, Easy to Use, Versatile Robotics Kits....

I've used a 433mhz version of RF transmitter+receiver module for my pc controlled wireless robot and I do have faith on these components. These can give you good range (in terms of distance) as well. The only difference in your approach and my approach is ... I transmitted digital pulse over RF and you might be transmitting analog signal over RF. Both the things are possible with these kind of RF modules.

You will need to see what kind of data transfer rates you get on such a transceiver. I wouldn't expect more than a few kbps (even though they are rated upto 57 kbps) and that may not be sufficient for good sounding audio. Also there is no error correction built into these transceivers (you need to do it yourself at the transmitting and receiving ends) and this would cause audio clipping if not done properly. So while these transceivers are excellent for sending little amount of data (such as in robotics) they may not be good for continuous audio streaming purposes. Not to mention you would also need microcontrollers at both the transmitting as well as receiving ends to use these transceivers. And of course, an analog to digital converter at the transmitter end and a DAC at the receiver end.

For practical reasons I would prefer bluetooth (which is also at 2.4 GHz and has built-in error correction and a data rate of 2 mbps) than these transceivers for streaming audio. Plus bluetooth transmitters are already present in phones/tablets and receivers are pretty cheap. But yeah, this doesn't solve the range problem.

 

[kaushik]

our beloved china item may rescue us:just 4 usd for 100m range
Bluetooth 2.0 EDR Class 1 Vista-Ready USB Dongle (100-Meter Range) - Free Shipping - DealExtreme

not sure it will do stereo a2dp

some good work with cheap bt receivers ,gives 90 feet http://technicalredneck.blogspot.in/2011/04/bluetooth-cb.html

update : 2 of these http://www.dinodirect.com/b2-bluetooth-headphones-currency-INR.html
one each in speakers R/L should complete the dream

So finally

tab-->long range Bt dongle-->....wireless link.. ...> to 2 powered speakers with Bt Rx units


what say?

 

[manoj.p]

X10.com - 5.8 GHz Wireless Video Sender Plus

Ignore the site design, it looks cheesy. But I have ordered from them in the past for home automation modules. Anyways, this unit is 5.8 GHz RF, comes with L,R and video. That should give you wireless 3 channel analog audio/video. Costs only $50.

 

[kaushik]

X10.com - 5.8 GHz Wireless Video Sender Plus

Ignore the site design, it looks cheesy. But I have ordered from them in the past for home automation modules. Anyways, this unit is 5.8 GHz RF, comes with L,R and video. That should give you wireless 3 channel analog audio/video. Costs only $50.

very nice unit ..Goes thru walls..with good antenna
problem is the cost 2 units =80USD

3 units =120usd ....for wire free 2 speakers

if i have to wire from 1 receiver ,the speakers will not be clutter free.
BTW other components :
AMP:
Twin boards from sure electronics can serve the amp,or el-chapo diy tda2050 amp will do
2 speakers from dead 2in1 will serve well ,max 800Rs
http://www.ebay.com/itm/2-X-25-Watt..._Audio_Amplifiers_Preamps&hash=item19d41c2a4e

same txtx with only audio will be cheap i suppose