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Twisted Pear Audio Opus DAC - Page 51

post #751 of 987
8/10/08 at 9:53pm
I was hooking up the S/PDIF Module this evening and checked for resistance between signal and ground on the S/PDIF_IN once I was done. There was resistance between the two. So, I pulled the wires off and removed the board. Checked again, still had resistance between signal and ground (no solder bridges). It's only on the S/PDIF_IN side.

I "assume" this isn't normal. Any thoughts?
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post #752 of 987
8/10/08 at 9:55pm
Quote:
Originally Posted by Ech0 View Post
I was hooking up the S/PDIF Module this evening and checked for resistance between signal and ground on the S/PDIF_IN once I was done. There was resistance between the two. So, I pulled the wires off and removed the board. Checked again, still had resistance between signal and ground (no solder bridges). It's only on the S/PDIF_IN side.

I "assume" this isn't normal. Any thoughts?
This s normal as long as it 75 ohms.
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post #753 of 987
8/10/08 at 11:17pm
Indeed it was 75 ohms.

This puzzles me a bit, but, I'm glad I'm good to go. Thanks for the fast response Russ. I can't wait to finish this baby up.

The packaging was outstanding as I've read before. Someone must be a little obsessive.
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post #754 of 987
8/11/08 at 12:07am
Quote:
Originally Posted by Russ White View Post
There is no ballsie involved. Those are Three IVYs.

The two IVYs on the right are configured for mono DACs (either Opus or COD). They have balanced only outputs.

The IVY on the left is simply doing balanced to single ended conversion. This way you can have SE outputs that are the sum of balanced output at the same level as the balanced output. The best way to get a clean SE signal is to sum the balanced signal.

The text expands on this a bit.

Cheers!
Russ
Just wondering if all three of these could be powered properly off of one or two LCBPS with one of the recommended Lindberg transformers? (Not along with the DAC too of course)
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post #755 of 987
8/11/08 at 12:14am
Quote:
Originally Posted by manaox2 View Post
Just wondering if all three of these could be powered properly off of one or two LCBPS with one of the recommended Lindberg transformers? (Not along with the DAC too of course)
Just one LCBPS with one of those dual secondary transformers is just fine for all three. But two would work too.

Cheers!
Russ
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post #756 of 987
8/11/08 at 12:23am
Quote:
Originally Posted by manaox2 View Post
Just wondering if all three of these could be powered properly off of one or two LCBPS with one of the recommended Lindberg transformers? (Not along with the DAC too of course)
Actually, I've been wondering about something similar to this as well......

I was planning to run both 'channels' of an LCDPS from a single 15V 7.5VA secondary winding (one channel VD for Buffalo, one channel OTTO and LEDs). But with losses from two sets of rectifiers and two regulators, I'm wondering whether it will be enough.

So Russ: do you have any approximate figures for current/power draw for OPUS, IVY and Buffalo at the recommended supply voltages?
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post #757 of 987
8/11/08 at 1:40am
Quote:
Originally Posted by Russ White View Post
Just one LCBPS with one of those dual secondary transformers is just fine for all three. But two would work too.

Cheers!
Russ
Thanks for that, I am considering it when I get ready to purchase the Joshua Tree when it finally comes back into stock.
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post #758 of 987
8/13/08 at 11:57pm

Opus up and running....

Many thanks Brian & Russ for this fantastic DAC. It was a fun build and I really like the modules concept for flexibility of parts desired, but, it also made the layout attractive, IMO. Once I got the settngs configured properly the DAC w/my amp combo is dead silent when no music is being sent through. I've only listened to the opus for a short while but the clarity is the first thing I noticed. It was as if my previous DAC muffled the sound. My previous setup struggled on some highs particularly female vocals. Sorry, for the poor word choice I've not had a lot of experience having only listened to a marginal amount of gear.

Anyway, the only issue I had was following the recommended setting for each module I ended up w/static only. I found the answer at the Twisted Pear website (forum). Someone else experienced this issue and Russ suggested changing the OSR setting on the Opus to "+". The manual (version 2.0) recommends leaving this switch open. Though I'd mention it might help someone else.

Setup is as follows: S/PDIF > Metro > Opus > Ballsie

Thanks again guys and I'll post pics tomorrow for anyone interested.

Edit: The static issue was with the Metronome set 192khz output.
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post #759 of 987
8/18/08 at 2:59am
hi, i'm newbie in DIY and want to ask something
what's the difference between Ballsie and IVY module?
thanks
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post #760 of 987
8/22/08 at 10:47pm
Quote:
Originally Posted by Bozz_Keren View Post
hi, i'm newbie in DIY and want to ask something
what's the difference between Ballsie and IVY module?
thanks
page 66

laziness is the worst sin
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post #761 of 987
8/27/08 at 3:56pm
I'm trying to recommend the Opus DAC to someone, but the website says all the modules are "Out of Stock". Is that the case?
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post #762 of 987
8/27/08 at 3:59pm
Quote:
I'm trying to recommend the Opus DAC to someone, but the website says all the modules are "Out of Stock". Is that the case?
I am on a bit of a vacation (actually getting ready to sell our house). I will have the site back online in a few days, with most things back in stock.
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post #763 of 987
8/31/08 at 2:56am
Finished... for real this time... until I get a metronome...

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post #764 of 987
8/31/08 at 3:05am
Sweet!
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post #765 of 987
9/10/08 at 8:16am
Has someone ever tried the Opus DAC combined with a Zapfilter?
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