DIY Upgrade of "commodity" S/PDIF sourround processor - diyAudio
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Old 15th December 2013, 07:00 PM   #1
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Default DIY Upgrade of "commodity" S/PDIF sourround processor

There are few in-between options for Surround decoders. There are the $50 "commodity" ones, like this:

Amazon.com: Vktech 5.1 Channel Ac3 DTS Audio Gear Digital Surround Sound Rush Decoder Theater: Car Electronics

and there are the ones built-in to Home Theatre preamps ($2000-$4000)...and then there are the "audiophile" ones. ($5000+)

What I'd like to do is make the best of a $50 one by adding a better power supply than the wall-wart, and adding balanced outputs. And here's my question:

Would there be any problems with obtaining balanced output by powering one of these $50 S/PDIF surround decoders with +/- 2.5 volt instead of 5 volts?

I dialed this into a bench power supply I have, the device seems to be happy. I wired an XLR connector so ground was the power supply neutral, - was the original RCA connector "ring" and the + was the original RCA connector tip, and the monitor seemed happy.

I 'm making sure that nothing tries to ground the S/PDIF processor (i.e., no USB connections into it, etc). The neutral on the XLR cable is the power supply's neutral.

Am I actually producing balanced output this way, or am I just deceiving myself and do I need to go the traditional route of transformer or chain-of-opamps?

There doesn't seem to be any power-conversion chips on the board, so the +5v is used directly by the existing amplifier.

Last edited by thrillscience; 16th December 2013 at 02:20 PM.
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Old 16th December 2013, 09:51 PM   #2
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Default Unclear to me

It's unclear to me what exactly you are tying to implement. For example, what does a +/- 2.5V supply versus a +5V supply have to do with whether you can get balanced operation or not? Also, should you have it, uploading the schematic would greatly help us to help you.
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Old 16th December 2013, 10:02 PM   #3
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Originally Posted by Ken Newton View Post
It's unclear to me what exactly you are tying to implement. For example, what does a +/- 2.5V supply versus a +5V supply have to do with whether you can get balanced operation or not? Also, should you have it, uploading the schematic would greatly help us to help you.
I want the line level audio output to be +/- relative to the neutral line.
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Old 17th December 2013, 01:15 PM   #4
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Originally Posted by thrillscience View Post
I want the line level audio output to be +/- relative to the neutral line.
Why?
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Old 17th December 2013, 04:30 PM   #5
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Quote:
Originally Posted by thrillscience View Post
I want the line level audio output to be +/- relative to the neutral line.
That only matters if you plan to direct couple the output.
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