I have decided to rework the entire analog output stage of my Xmeridian, from the DAC's out. I am building a seperate PCB for the filter network, and opamps, which will also have it's own external PSU to supply +-15V for the opamps. This will also allow me to cut the gain and output voltage of the card. I will be using 8 single channel opamps, instead of 4 dual's. I would like to use OPA627's, but I have only been able to source out 2 for now, still looking for 2 more for the Sub/Center channel, they are 8 SOIC. The surrounds will use LME49710's which are the same as a LM4562.
It should be an interesting project, and I will get some pics when it is done.
Joined: 08 Mar 2006 Posts: 25456 Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
Link Posted: Sat Feb 23, 2008 6:17 am Post subject:
Mike Parkerish mods for sound cards....you may have your own little industry there. Have you thought of using the add on daughter card that's available for these cards? _________________ Tech support for nothing
Joined: 17 Jul 2007 Posts: 231 Location: Stayner, ON
Link Posted: Sat Feb 23, 2008 12:22 pm Post subject:
The extension only adds another optical in/out and a couple other things, but does not do anything with the analog outputs. What I am building is a seperate card as well, and will fit into a PCI slot in the computer. The 3.5 mm outputs will be spaced farther apart allowing larger diameter cables and plugs to be used.
All resistors are .01% metal film, 2% poly film filter caps, seperate +-Regs for each output channel with bypass caps before the Reg and before the opamp.
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