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Tangent Young-Jung power supply - Page 10

post #136 of 162
6/12/09 at 5:14pm
I'm really digging the production YJPS



I'm really skeptical of my ability to hear any difference between the YJPS and STEPs powering my PPA v2, but it's so cool and at about $100 total I can't resist

This thing can put out a ton of power too, with ability to fit a +-12V 25VA transformer.
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post #137 of 162
6/12/09 at 5:34pm
2009 is the year of the red pc board??



lets see some pics when you populate it.
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post #138 of 162
6/12/09 at 6:20pm
Thanks, rds!

FYI, I just got these in a few days ago, and put them in the shop without having built one yet so the impatient can get one before then.

Changes since the v1.1 prototypes:

- added an SCR-based crowbar on the output to prevent the "schubert" problem

- C5 previously allowed three caps from 10mm to 18mm, but now allows four 10-12.5mm caps, three 16-18mm caps, or two 20-25mm caps

- C1, C2L and C2N now allow 12.5mm pitch caps in addition to the 10 and 15mm pitches perviously allowed

- changed VOUT to use the 4mm pin spacing Molex KKs instead of the 0.1" variety, so you can use 18 gauge wire for the regulated output to the load

- Moved A-D and W-Z transformer jumper pads closer to the transformer pins; so, longer jumpers required, but jumpers can use more copper than I could lay down on the PCB between these points.

- JRSG and JRSV are now Molex KK connectors (0.1") instead of wire jumpers, so you can more easily set up remote sense connections.

- larger mounting holes for board and heat sinks

- 2 more test points

- lots of minor trace and part positioning tweaks
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post #139 of 162
6/12/09 at 7:39pm
Nice looking board! I like the lightning bolts.

Are those fat holes for snap-ins?
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post #140 of 162
6/13/09 at 12:33am
You know, I don't remember exactly why I enlarged the main board mounting holes. Maybe just to allow #6 bolts?
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post #141 of 162
6/28/09 at 9:10pm
Quote:
Originally Posted by PJPro View Post
Did schubert ever sort out his problem?
No, I didn't - I put it away, figuring I'd get one of the new boards and try again, and things got busy around here, so I've been away from the forum for a while. I noticed on a recent post by tangent that one of the changes in the new board was related to my problem ("added an SCR-based crowbar on the output to prevent the "schubert" problem"), but I didn't understand it. Can anyone enlighten me? Tangent, did you figure out what the problem must be?

(I've since read tangent's description of the "crowbar", so now I have a general idea how it works. As far as I can tell it doesn't fix my problem, but just prevents it from doing significant damage.)
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post #142 of 162
6/29/09 at 7:34am
It was my understanding that all of the problems you had after the overvoltage event were just secondary effects of that same problem. It's possible your power supply really has some independent problem, but lacking further details from you...

Besides which, the crowbar is still a good idea.
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post #143 of 162
6/30/09 at 8:55am
Make sure your crowbar does not say "Stanley" on it. That would definitely cause trouble.

I reserve the Stanley crowbar for repairs with extreme prejudice only.
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post #144 of 162
7/15/09 at 3:36pm
Quote:
Originally Posted by rds View Post
I'm really digging the production YJPS
Yea I'm diggin' it too.
Having read the tangent website and this thread, I can't seem to find the safe current limit, or power limit, of this PS. Would it go 160mA or more at 6.6v?

Thank you so much Tangent for making this pcb available, there is not much to choose from elsewhere.
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post #145 of 162
7/16/09 at 1:18am
Quote:
Originally Posted by digger945 View Post
I can't seem to find the safe current limit, or power limit, of this PS.
R6

Quote:
Would it go 160mA or more at 6.6v?
Yes, if you change the reference, as described here: D4
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post #146 of 162
7/16/09 at 1:57am
Red? Looks like my old 9800 Pro.
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post #147 of 162
7/17/09 at 2:01pm
Quote:
Originally Posted by rds View Post
I'm really skeptical of my ability to hear any difference between the YJPS and STEPs powering my PPA v2, but it's so cool and at about $100 total I can't resist
Interesting comments, I will build one later then compare it to STEPS and AMB's Sigma22.
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post #148 of 162
3/19/10 at 5:55pm
I plan to build a YJPS for a PPAv2. How important is it to set up a 4-wire remote sensing if the distance between the units will be about a foot (or two feet max)?

I plan to use a regular 2.5mm DC power connector (18awg). If it will make a difference, I was planning to add a second 2.5mm connector to PPA for remote sensing. Would this work?
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post #149 of 162
3/19/10 at 6:02pm
thats quite a massive distance actually, thats quite a lot of impedance, capacitence and inductance right there. for inductance to have little to no effect, you really should have the supply 10cm or less from the load. in fact i'm of the opinion that its going to pretty much waste any benefit of having a decent regulated supply if you place it that far from the load. you will need to at the minimum bypass the load well to attempt to fight any ripple the distance causes, so absolutely yes, if there was ever a reason to use sensing this is it IMO
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post #150 of 162
3/19/10 at 6:44pm
I see. It's really difficult to put together a decent arrangement for a PPAv2 powered by a YJPS (each in a Hammond case). If I place the PPA on top of YJPS, the AC-in and DC-out will have to be at the back of YJPS box, resulting in an over 10cm distance between the load and source (and the DC and AC will be close together). If I place the PPA in front of YJPS, then I can have the AC-in and DC-out at opposite ends of the YJPS box. But then there will have to be some distance between the boxes so I can attach the RCA jacks comfortably to the back of PPA. Any solutions?

By the way, Tangent does not mention the "two separate 2.5mm DC connectors" solution for remote sensing. Can I use this method instead of a, say, 4-pin XLR configuration? I couldn't find a way to get a 4-connector shielded cable (18 awg or larger) at a reasonable price. The connectors are expensive as well.
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