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Tangent Young-Jung power supply - Page 5

post #61 of 162
11/6/08 at 1:05pm
Quote:
Originally Posted by MASantos View Post
Tangent, I can't see the image you posted above. Do other members see it?
http://tangentsoft.net/elec/yjps/bitmaps/board-1.1.png

EDIT
n_maher got it first
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post #62 of 162
11/6/08 at 2:38pm
Quote:
Originally Posted by n_maher View Post
Tangent's url just got cut off.
No, tangent just proved to himself that he still does occasionally post a URL publicly that points to his private web server.
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post #63 of 162
11/6/08 at 3:27pm
Just a random idea...

I wonder if it might be useful to include a spot for a current sensing resistor before the output. Would be very handy for testing amps.
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post #64 of 162
11/6/08 at 3:51pm
The point of this supply over something more typical is extremely low output impedance. You can't put a resistor on the output directly, or you'll wreck that. You could work out some kind of jumper scheme, but even that adds more resistance to the output.

If you install a Molex KK connector on the output, you can rig up an alternate version with such an inline resistor, or simply break the circuit with it so you can insert an ammeter.
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post #65 of 162
11/10/08 at 6:07pm
Gerbers away.
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post #66 of 162
11/21/08 at 1:40am
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post #67 of 162
11/21/08 at 7:33pm
Tangent: will you be offering a kit for this (as opposed to the boards only) and also, will it be possible to do a dual rail supply with it?

Fran
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post #68 of 162
11/21/08 at 10:57pm
Quote:
Originally Posted by fran View Post
will you be offering a kit for this
Sorry, no. Too many parts, many of them expensive. I wouldn't have a problem selecting a set of parts, but the expense and difficulty of kitting them in a sane fashion...<shudder>...

Quote:
will it be possible to do a dual rail supply with it?
Sure, but it would be inefficient. You'd end up with at least two YJPS boards, and either one or two transformers, depending on how you want to work that. If that's your goal, I think you'd be better off going with one of the small transformer-less Jung regulator boards that already exist.

And no, there won't ever be an inherently "dual" version of the YJPS, with everything on a single board. It's not my niche.
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post #69 of 162
11/21/08 at 11:13pm
Thread Starter 
Those are pretty impressive numbers on that sheet of paper...
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post #70 of 162
11/22/08 at 4:10am
Yes, that's rather the point of showing them.

I especially like the fact that the regulated output value didn't change at all when going from no load to a 105 mA load.

I haven't yet done LNMP testing, this is just my raw DMM readings. (My LNMP is broken at the moment. Grrr.)
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post #71 of 162
11/25/08 at 1:47pm

Application question

I hope an application question is OK here, even though this seems to be mostly a design thread. I need a new power supply for my Sota turntable - would the Young-Jung supply be appropriate for this use? Some details - my current supply puts out 25VDC (no regulation) and the motor momentarily draws around 150 mA while accelerating (occasionally up to 220 mA) and then settles to less than 50 mA. I'm looking for a lower cost high-performance alternative to Sota's "electronic flywheel", which is $300.

Thanks!
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post #72 of 162
11/25/08 at 7:21pm
I don't see why this wouldn't work, but then, I've never built or even modded a turntable.
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post #73 of 162
11/25/08 at 7:57pm
OK thanks Tangent, I'll go ahead. And thanks in general for all your work on the PPA etc - I built a PPA and a STEPS and I love them!
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post #74 of 162
11/28/08 at 5:53pm
I have a question about the filter that precedes the toroid in the schematic. Can this filter be applied to any electronic device's power supply?
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post #75 of 162
11/28/08 at 8:59pm
Quote:
Originally Posted by espressogeek View Post
I have a question about the filter that precedes the toroid in the schematic. Can this filter be applied to any electronic device's power supply?
It's basically identical to the circuit used in inexpensive line filters (e.g. http://www.cor.com/pdf/K.pdf), but with a beefier choke. You can use it for any circuit, provided you observe part ratings. Make sure you use line-rated components (C1 must be class X, C2 class Y) for safety.
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