Tangent Young-Jung power supply

[rds]

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.

[linuxworks]

2009 is the year of the red pc board??



lets see some pics when you populate it.

[tangent]

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

[Voodoochile]

Nice looking board! I like the lightning bolts.

Are those fat holes for snap-ins?

[tangent]

You know, I don't remember exactly why I enlarged the main board mounting holes. Maybe just to allow #6 bolts?

[schubert]

Originally Posted by PJPro

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.)

[tangent]

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.

[Voodoochile]

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.

[digger945]

Originally Posted by rds

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.

[tangent]

Originally Posted by digger945

I can't seem to find the safe current limit, or power limit, of this PS.

R6

Would it go 160mA or more at 6.6v?

Yes, if you change the reference, as described here: D4

[dbfreak]

Red? Looks like my old 9800 Pro.

[applegd]

Originally Posted by rds

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.