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
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
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.. good luck, and i'd like to know of any progress (thinking of building a digital decoder into my pre-amp, and emulating 2 channel sources into 5.1 etc... :/)
soundNERD said: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.
ok.... Red and white wires, referred to RCA, are two channels of audio, red is right [correct me if i'm wrong ], and white is left... you *will* need coax/optical input of sorts... unfortunately i believe the Cirrus chip i'm getting is in a big pain in the a** package , its a sqaure chip, IIRC, i forget the name, is it SSIP? ... i think its 4sidesX10 contacts per each, 40 total pins, not sure though....and i hope its not surface mount or i'll be really bummed... but anyway, www.cirrus.com... good luck! (btw i'll let you guys know when i recieve my chip ) also, dont get scared just because of a surface mount or non-dip chip ... make a simple pcb that has terminals (pin headers) for each pin down along the side if you would like to work on it easier ..., so you never have to remove the chip, and will have the pin header, and you could even get a IDE connector, which is 40 pin, and carry all of the pins from the chip to another board or prototyping station (IE: setup would be, PCB w/ chip attached to a IDE Cable thatp lugs into a prototyping breadboard ... just my suggestion)
SMD Package
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
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
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.
It could be OK. Im fortunate in that where I am I have access to smt/pcb technology so Ive never tried the laser print and peel option.
It might be an idea to see if theres anywhere near you that can offer reflow soldering or a similar technique.
I soldered a o.5mm lead spacing package onto a pcb before, and whilst its certainly possible, you do have to be pretty delicate and be very mindful of the amount of heat you put into the lead. A small heatsink would be a good idea.
It might be an idea to see if theres anywhere near you that can offer reflow soldering or a similar technique.
I soldered a o.5mm lead spacing package onto a pcb before, and whilst its certainly possible, you do have to be pretty delicate and be very mindful of the amount of heat you put into the lead. A small heatsink would be a good idea.
Re: SMD Package
Yeah figured, thats fine though that its smd ... i can deal with it ... i can make a PCB for it, yet again not a problem... You could do that just like they are doing with the Aleph-X Boards.... unelss thats too big of a operation for you(which i can understand )
machinow said: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
Yeah figured, thats fine though that its smd ... i can deal with it ... i can make a PCB for it, yet again not a problem... You could do that just like they are doing with the Aleph-X Boards.... unelss thats too big of a operation for you(which i can understand )
How about making a normal 5/6/7 channel pre-amp, and using (if your dvd has them) the pre-outs?
There's a number dvds out there that do 5.1 decoding, unless i'm mistaken.
Then all you'd have to do is simply make a preamp w/ 5 channels (just a normal pre-amp), and then make 5+ separate amps for it.
There's a number dvds out there that do 5.1 decoding, unless i'm mistaken.
Then all you'd have to do is simply make a preamp w/ 5 channels (just a normal pre-amp), and then make 5+ separate amps for it.
elizard said:How about making a normal 5/6/7 channel pre-amp, and using (if your dvd has them) the pre-outs?
There's a number dvds out there that do 5.1 decoding, unless i'm mistaken.
Then all you'd have to do is simply make a preamp w/ 5 channels (just a normal pre-amp), and then make 5+ separate amps for it.
hmmm... no, that defeats the purpose,we [as far as i know] want an optical or coaxial sp/dif connectioon from [insert device here]... but i would like to make it part of a pre-amp.... i just lack the abilities to do so, so i'll bs about it until i know exactly how to do it
koolscooby said:
hmmm... no, that defeats the purpose,we [as far as i know] want an optical or coaxial sp/dif connectioon from [insert device here]... but i would like to make it part of a pre-amp.... i just lack the abilities to do so, so i'll bs about it until i know exactly how to do it
I guess I misunderstood the original post then.
You can't of course using the coax or optical connection with this, but its an alternative to building a separate decoder.
nFORCE said:
??... Mind sharing? hehe
why dont you try one of these:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=1499&item=3063034610
i want to buy one when i will build my system!
only costs 35euros
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=1499&item=3063034610
i want to buy one when i will build my system!
only costs 35euros
KostasTheGreat said:why dont you try one of these:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=1499&item=3063034610
i want to buy one when i will build my system!
only costs 35euros
because the only challenge in that is 35 euros for you or the equal USD for me... but if i were to build something, then its alot more nicer to me and i'd be less likely to break it (Because i put hard work into it! ) hehe
[and this is a diy board ]
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