It works (DAC + Bridged Gainclone)!

MWP · 8th September 2004, 02:33 PM

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

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

carlosfm · 8th September 2004, 03:17 PM

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.

MWP · 8th September 2004, 04:00 PM

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

MWP · 8th September 2004, 04:03 PM

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.

thomas997 · 9th September 2004, 03:09 AM

wow looks good.

How much was the approximate cost for all that?

You should sell some

MWP · 9th September 2004, 09:37 AM

Building the full amp (3 of those PCBs, 3*300VA torids, 19" 3U case, misc stuff) has cost me ~$800AU (~$550US).

8th September 2004, 02:33 PM	#1
MWP diyAudio Member Join Date: Oct 2002 Location: Adelaide, South Australia	It works (DAC + Bridged Gainclone)! I know there are lots of these "success" threads, but this amp is a little different 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 -> 2OPA627 -> 2LM3886 (bridged) Schematic here: http://www.overclockers.com.au/~mwp/...p-dac-amp1.pdf Yay

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8th September 2004, 03:17 PM	#2
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	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.

8th September 2004, 04:03 PM	#4
MWP diyAudio Member Join Date: Oct 2002 Location: Adelaide, South Australia	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.

9th September 2004, 03:09 AM	#5
thomas997 diyAudio Member Join Date: Feb 2004 Location: Vancouver	wow looks good. How much was the approximate cost for all that? You should sell some

9th September 2004, 09:37 AM	#6
MWP diyAudio Member Join Date: Oct 2002 Location: Adelaide, South Australia	Building the full amp (3 of those PCBs, 3*300VA torids, 19" 3U case, misc stuff) has cost me ~$800AU (~$550US).