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Old 9th October 2010, 01:38 AM   #521
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Wayne,

Would it be possible to see some shots of your finished Pearl 2? I would love to see how you laid it out, wired it and so forth. I'm still putzing around with ideas, but am having difficulty proceeding, as I really want this one right the first time! It's fine if this isn't possible, just asking!

Thanks,

Russellc
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Old 9th October 2010, 07:29 AM   #522
nar is offline nar
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Quote:
Originally Posted by Russellc View Post
Wayne,

Would it be possible to see some shots of your finished Pearl 2? I would love to see how you laid it out, wired it and so forth. I'm still putzing around with ideas, but am having difficulty proceeding, as I really want this one right the first time! It's fine if this isn't possible, just asking!

Thanks,

Russellc
Yes, Wayne, I second that
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Old 9th October 2010, 03:20 PM   #523
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Not to be a Whiner, I just want this component to be quiet as possible and not have to re assemble it to get it quiet. Again, if not possible its no big deal. Would be nice to see how it should be done

Pretty please, (if possible)

russellc
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Old 9th October 2010, 06:20 PM   #524
nar is offline nar
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Quote:
Originally Posted by Russellc View Post
Not to be a Whiner, I just want this component to be quiet as possible and not have to re assemble it to get it quiet. Again, if not possible its no big deal. Would be nice to see how it should be done

Pretty please, (if possible)

russellc
Will show you what I did as soon as the project is completed

I intend to run with single PSU

Try with V+ GND V- at each board
Input gnds separate
Use Wayne's wiring scheme for PSU

It should be OK

Best regards,

nAr
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Old 9th October 2010, 06:32 PM   #525
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Appreciated, but I'd love to see the creator's work!

Russellc
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Old 14th October 2010, 09:01 PM   #526
wayne is offline wayne  United States
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I think I have some photos stashed. I will see what I can find.
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Old 14th October 2010, 10:11 PM   #527
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I think I have some photos stashed. I will see what I can find.
Much appreciated!

Russellc
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Old 23rd October 2010, 04:05 AM   #528
wayne is offline wayne  United States
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Default Pearl II Photos

Here is a photo from my home bench. I am putting these in a box soon.
Attached Images
File Type: jpg Pearl.jpg (146.0 KB, 796 views)
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Old 23rd October 2010, 05:13 AM   #529
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Quote:
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Here is a photo from my home bench. I am putting these in a box soon.
Quite glamorous!

---
nAr, the boards seem to have come out quite nicely!

I have not yet begun to work on this as I've been busy with non-audio things of late. But as the air grows colder I may move back inside soon
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Old 23rd October 2010, 05:59 AM   #530
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Quote:
Originally Posted by eclectic2k View Post
Quite glamorous!
Yes, it's the epic. The bench is nice and Wayne has oscilloscope too, seen the probes.

Quote:
Originally Posted by eclectic2k View Post
nAr, the boards seem to have come out quite nicely!

I have not yet begun to work on this as I've been busy with non-audio things of late. But as the air grows colder I may move back inside soon
You're welcome Yes, boards have come out quite easily. As of today I've finished populating the boards. Some random comments:
  • I started drilling the boards with a cheap hand micro-driller and it turned out that it's impossible to be 100% vertical this way. I mean, for a single sided board it can be OK, if you're drilling for copper side and accept some incoherency. For the double sided board, it can come out catastrophic. I ended up using the big drill press from the basement, yes even 0,8 mm drills fit well inside the drill cylinder, once screwed there is no bad move and I could adapt the drilling speed to about 1500 RPM, so the drills keep a better shape thorough the job. Remember, about 360 holes for a stereo set.
  • I ended up using some 5% MKT for the 0,1 uF parts, mostly because the MKP 1% versions from Vishay weren't available . However, I matched them by hand from a batch of 50 to get a better accuracy, and they are always bypassed by the MKP 1% values anyway (0,01 and 0,033 uF). Even the MKP were matched with the capacimeter to get real precise values down to 0,1%. I just hope it will be worth the effort
  • I used 2 match quads @6,30-6,27-6,29-6,30 mA and 6,13-6,19-6,16-6,19 mA and the Dale 10 ohm resistors, and 2 matched pair @ 5,81-5,80 and 5,89-5,88 mA for the differential. No problems for implementing, but I juste hope it works
  • For now PSU is ready, I used a 300VA 2x24V RCore, it's ridiculous but it was lying around ... then suggested Wayne's PSU as seen in the article. I found a small mica 500V 0,0033 uF for mains pre-filtering. For now the PSU works, tested last night.

So what ? Now is the testing part ... I have to do this today. I hope it'll go fine, hey wish me good luck. If I'm fast enough, I will post some pictures later today. I need to secure the boards on a testing plane before plugging ... and also have the in and outs (provisoire) ready for listening.

Best,

nAr
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