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Chip Amps Amplifiers based on integrated circuits

It works (DAC + Bridged Gainclone)!
It works (DAC + Bridged Gainclone)!
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Old 8th September 2004, 02:33 PM   #1
MWP is offline MWP  Australia
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Join Date: Oct 2002
Location: Adelaide, South Australia
Default It works (DAC + Bridged Gainclone)!

I know there are lots of these "success" threads, but this amp is a little different

Click the image to open in full size.

As far as i can tell so far, it works perfectly.
Now i just have to build another 2 of them (i need 6 channels for active xovers).

There are two audio channels on this board each using:
SPDIF-IN -> DIR1703 -> PCM1798 -> 2*OPA627 -> 2*LM3886 (bridged)

Schematic here:
http://www.overclockers.com.au/~mwp/...p-dac-amp1.pdf

Yay
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Old 8th September 2004, 03:17 PM   #2
carlosfm is offline carlosfm  Portugal
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MWP, does the DIR1703 work fine?
With different sample rates?
It seams that the DIRs had a problem and TI took them out, no DIRs anymore.
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Old 8th September 2004, 04:00 PM   #3
MWP is offline MWP  Australia
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Location: Adelaide, South Australia
Quote:
Originally posted by carlosfm

MWP, does the DIR1703 work fine?
With different sample rates?
It seams that the DIRs had a problem and TI took them out, no DIRs anymore.
It works fine with 44.1 and 48Khz without a reset between the change.
I tried with 96Khz which didnt work, but thats probably beacuse of the cheapie optical recievers im using.

Im glad i have a bit of a stash of DIR1703's here
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Old 8th September 2004, 04:03 PM   #4
MWP is offline MWP  Australia
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Wow.
This dac/amp sounds pretty damn good.

A little 50Hz hum on one of the channels, but that should be easily fixed.
The other channel is 100% quiet with no audio... exactly what im after since i sit under 1 meter from my speakers.
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Old 9th September 2004, 03:09 AM   #5
thomas997 is offline thomas997  Canada
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wow looks good.

How much was the approximate cost for all that?



You should sell some
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Old 9th September 2004, 09:37 AM   #6
MWP is offline MWP  Australia
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Building the full amp (3 of those PCBs, 3*300VA torids, 19" 3U case, misc stuff) has cost me ~$800AU (~$550US).
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