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#1 |
diyAudio Member
Join Date: Sep 2003
Location: Illinois
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Hi,
I currently have a 100Wx2 Kenwood amp powering 2 front and 2 rear speakers. It distorts easily, and goes into protect mode with too much bass. I would like to upgrade to surround sound, and of course build the amp myself. I plan on using 2 sets of 2 lm3886 bridged for the two main channels, and 1 lm3886 for the rear speakers and the center channel. My sub is in progress right now and will use 4 lm3886 in B/P mode to get 300W into a 4-ohm speaker. Now, I need to find a way to decode the surround sound from the red and white analog wires from the dvd player. I would like to use optical or coax connection to make it easier, but all I could find was a 2-channel coax decoder from www.sound.au and was told a few months ago by people on this site that it wouldn't even work for dvds since dvds output digitally in 5.1channel mode, not 2 channel mode. Is it possible (and simple) to build a decoder? If chips are required, they have to be something I can solder (a DIP would be great). I was going to build the 2 channel one and see how it works, then when the samples arrived, I noticed that they were tiny SIP chips. Thanks for the help, Mike |
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#2 |
diyAudio Member
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#3 |
diyAudio Member
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Yes, Cirrus makes a 5.1 decoder chip, check out the CS492x series chips, i got a sample 492[something], not arrived yet, but i only requested it a week ago, and those things take time..
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__________________
Brad |
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#4 |
diyAudio Member
Join Date: Dec 2002
Location: Bulgaria, Sofia
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I also wanted to try building a decoder , but isn't it easier to get one from an old receiver??? And do some DAC/ADC/PSU/Clock mods to improve sound//
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#5 |
diyAudio Member
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possibly, but when you dont have a old box and you can get free samples from Cirrus, why not at least try?
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__________________
Brad |
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#6 | |
diyAudio Member
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ok.... ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
__________________
Brad |
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#7 |
diyAudio Member
Join Date: Dec 2002
Location: Bulgaria, Sofia
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Don't want to dissapoin u, but it is Surely SMD - I expect PQFP/TQFP packages. I have no problems soldering down to 0.65mm interlead distance packages, only 0.5mm is a little bit difficult. And you will need a PCB for it, too.
I ordered samples of it, too, and if I have the time and money I can make a PCB for it, and some DAC/ADC's also. Is anybody interested?? Regards ![]() |
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#8 |
diyAudio Member
Join Date: Sep 2003
Location: Illinois
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Can any of those chips decode from a coax connection so I can get true 5.1 surround?
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#9 |
diyAudio Member
Join Date: Sep 2003
Location: Illinois
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Actually, is it possible to make a surface mount board using a laser printer and photo paper or press n peel. Or would the toner smear together. I would really like to just try building the coax adapter from www.sound.au.com just for the fun of it, but when I got my samples, I noticed that they are surface mount.
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#10 |
diyAudio Member
Join Date: Sep 2003
Location: Illinois
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Now that I looked at my samples of the CS8414 and the CS4334 chips, the pins aren't that close, and if I could use my laser printer and photo paper to make a pcb for it, it should work good. Right?
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