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Old 16th June 2018, 02:42 AM   #1981
Luke is offline Luke  New Zealand
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I use my Opus with no i/v and a pair of simple +5V regs made out of LM317 on veroboard. I like this dac and I am tempted to add a buffer and better regs, but it sounds nice as it is. Another option is to look at buying a used Buffalo, it really is a very good dac.
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Old 3rd November 2018, 09:28 AM   #1982
hqtimppa is offline hqtimppa  Finland
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Default Opus connection to amps (nCore)

Hi,

I'm building active loudspeakers using the Opus DACs to Hypex amp modules. From various forums I see people using this configuration without any output stages in between? Anyone built this combo? What's your suggestion, do I need e.g. IVY in between? I'm currently planning to use the NC502MP OEM module for the design, see the spec sheet from:
https://www.hypex.nl/img/upload/doc/..._02xx_03xx.pdf

Thanks in advance,
Timo
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Old 4th November 2018, 04:31 AM   #1983
twluke is offline twluke  Japan
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Mr White's "Opus", designing a simple balanced DAC
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Originally Posted by hqtimppa View Post
Hi,

I'm building active loudspeakers using the Opus DACs to Hypex amp modules. From various forums I see people using this configuration without any output stages in between?
The Opus (WM8741) is a kind of those DACs with voltage-output, requiring no I/V stage.

Quote:
Anyone built this combo? What's your suggestion, do I need e.g. IVY in between?
The IVY-III from TPA has a header of voltage input to accept the Opus output. Previously I built this combination, mainly in order to reduce possible external noise to which the Opus alone may be more susceptible (of course very subtle, if any). Though inactive now, it sounded great.

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Old 4th May 2019, 06:45 PM   #1984
manudrz is offline manudrz  France
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Quote:
Originally Posted by hqtimppa View Post
Hi,

I'm building active loudspeakers using the Opus DACs to Hypex amp modules. From various forums I see people using this configuration without any output stages in between? Anyone built this combo? What's your suggestion, do I need e.g. IVY in between? I'm currently planning to use the NC502MP OEM module for the design, see the spec sheet from:
https://www.hypex.nl/img/upload/doc/..._02xx_03xx.pdf

Thanks in advance,
Timo

I'm wondering the same with TPA3251 amps... Here is the input stage of mine, don't know how about impedances...

tpa3251entree.png
edit: forget the 10uF, as there are 22uF on the OPUS outs

Last edited by manudrz; 4th May 2019 at 06:49 PM.
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Old 6th May 2019, 05:09 PM   #1985
BrianDonegan is offline BrianDonegan  United States
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Mr White's "Opus", designing a simple balanced DAC
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Originally Posted by manudrz View Post
I'm wondering the same with TPA3251 amps... Here is the input stage of mine, don't know how about impedances...

Attachment 754311
edit: forget the 10uF, as there are 22uF on the OPUS outs
You could leave off the Opus output caps and use your amp's input section.
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Old 7th May 2019, 09:02 PM   #1986
manudrz is offline manudrz  France
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Ok, thanks for confirm Brian !
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