Transmiting audio for HT

sivan_and · 16th December 2004, 05:06 AM

Hello all , I need to transmit 2 channel audio signals to speakers in a home theature setup about 15 feet apart.Only power lines are available in the speaker positions (2 rear speakers),the audio signals are to be via a small receiver.Can't put cables from amplifier to rear speakers.The amplifiers are to be inside the speaker boxes.the input audio signals to be received via FM receiver
Available options are using 2 FM transmitters at the DVD player end and 2 receivers at speakers end,but because of poor stability,(W/o any PLL) the signals will tune out,
Any ideas ?

Enzo · 17th December 2004, 03:40 AM

Unless you are looking for a project to do, there are existing commercial products that do exactly that.

sivan_and · 17th December 2004, 03:52 AM

Thanx ENSO for rply.....Therz no such commercial product here locally here. bUT I do have an AV transmitter, but the sound o/p is mono.
Any project u know ?

Geek · 17th December 2004, 06:27 AM

All you need is two mono transmitters, that have selectable (or tunable) frequency ranges and two receivers

Do you not have a Radio Shack in India?

sivan_and · 17th December 2004, 06:45 AM

Yeah...RS is here in India,But costs are exorbiitant!!

quasi · 17th December 2004, 11:12 AM

This would be quite easy to make using an opamp to modulate the light output directly or you could FM modulate it. The receiver could be a photo-transistor etc... There are many circuits available on the web for this setup.

Build two directional units and set them up for line of sight.

Would look cool and be a discussion point too.

Cheers

sivan_and · 17th December 2004, 12:40 PM

Quasi!! good of you 4 Very a good suggestion,of using IR...Have to study indepth.
Quality of sound and interference from other light sources are of concern...
I think i have some IR receiver transisters with ambient light filters.
Will move the thread...

sivan_and · 17th December 2004, 02:32 PM

I have a couple of IR audio link ideas collected from web..
1. Simple Amplitude modulated.

2. FM modulated /demodulated PLL using CD4046.but uses hard to get CA3237E IR amplifier IC rcever end.
Circuit attached:

quasi · 17th December 2004, 11:54 PM

You have pass-word protected the zip file.

Cheers

sivan_and · 18th December 2004, 02:31 AM

I got this from the web, forgot the site address hence it may involve copyrights etc

16th December 2004, 05:06 AM	#1
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	Transmiting audio for HT Hello all , I need to transmit 2 channel audio signals to speakers in a home theature setup about 15 feet apart.Only power lines are available in the speaker positions (2 rear speakers),the audio signals are to be via a small receiver.Can't put cables from amplifier to rear speakers.The amplifiers are to be inside the speaker boxes.the input audio signals to be received via FM receiver Available options are using 2 FM transmitters at the DVD player end and 2 receivers at speakers end,but because of poor stability,(W/o any PLL) the signals will tune out, Any ideas ? __________________ SivanandBalan

17th December 2004, 03:52 AM	#3
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	Thanx ENSO for rply.....Therz no such commercial product here locally here. bUT I do have an AV transmitter, but the sound o/p is mono. Any project u know ? __________________ SivanandBalan

17th December 2004, 06:45 AM	#5
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	Yeah...RS is here in India,But costs are exorbiitant!! __________________ SivanandBalan

17th December 2004, 11:12 AM	#6
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	What about infra-red? This would be quite easy to make using an opamp to modulate the light output directly or you could FM modulate it. The receiver could be a photo-transistor etc... There are many circuits available on the web for this setup. Build two directional units and set them up for line of sight. Would look cool and be a discussion point too. Cheers __________________ http://sites.google.com/site/quasisdiyaudiosite/

17th December 2004, 12:40 PM	#7
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	Quasi!! good of you 4 Very a good suggestion,of using IR...Have to study indepth. Quality of sound and interference from other light sources are of concern... I think i have some IR receiver transisters with ambient light filters. Will move the thread... __________________ SivanandBalan


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17th December 2004, 03:40 AM	#2
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	Unless you are looking for a project to do, there are existing commercial products that do exactly that.

17th December 2004, 06:27 AM	#4
Geek diyAudio Member Join Date: Sep 2004	All you need is two mono transmitters, that have selectable (or tunable) frequency ranges and two receivers Do you not have a Radio Shack in India?

17th December 2004, 11:54 PM	#9
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	Hey Sivan_and; You have pass-word protected the zip file. Cheers __________________ http://sites.google.com/site/quasisdiyaudiosite/

18th December 2004, 02:31 AM	#10
sivan_and diyAudio Member Join Date: Dec 2004 Location: Dxb / India	I got this from the web, forgot the site address hence it may involve copyrights etc __________________ SivanandBalan

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