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Old 12th August 2005, 04:26 PM   #11
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Default Sorry for posting something that do not belong in this tread, but anyway....

Hi Kari

Do your email addy used in this forum work properly.
I have written an email to you, but dunno as if you have received anything.

Best regards
Toni
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Old 15th August 2005, 07:31 AM   #12
Kari is offline Kari  Sweden
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My email button should work, i've got a couple of mails from other users here @ diyaudio.com. However yours did not come trough, maybe my ISP's spamfilter blocket it? Please try again.

/Kari
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Old 15th August 2005, 11:48 AM   #13
dhole is offline dhole  United Kingdom
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Thanks Guys for the advice. I was thinking diodes.... I have resoldered one board and things are better.One cap on the other board has a bulge in the top so I guess its dead, but the board I have just done seems fine with the original caps. I was quite quick at seeing the fault .
I am getting higher voltages on output though.... +64v and -13v but I guess under load that will lower. Shouldnt fry anything with that should I ?

Dave
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Old 15th August 2005, 12:01 PM   #14
Kari is offline Kari  Sweden
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Quote:
Originally posted by dhole
Thanks Guys for the advice. I was thinking diodes.... I have resoldered one board and things are better.One cap on the other board has a bulge in the top so I guess its dead, but the board I have just done seems fine with the original caps. I was quite quick at seeing the fault .
I am getting higher voltages on output though.... +64v and -13v but I guess under load that will lower. Shouldnt fry anything with that should I ?

Dave
As you said, the voltage is going to drop under load. I think you are fine with those voltages and as i recall it metalman said that we should keep the - side above 10V, so your -13V is fine. I'm going to use 2 9.1V zeners at the negative side so i'm ending up with -14 to -15V.

Anyone else have any toughts?

/Kari
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Old 15th August 2005, 06:41 PM   #15
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Default Hi again Kari

I'm trying again, i hope it gets trough :-)
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Old 9th December 2005, 08:40 PM   #16
lgreen is offline lgreen  United States
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Did you ever get Kari's boards to work?
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Old 26th January 2006, 03:19 PM   #17
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cant we just leave those diodes out?
what do we need them for?
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Old 26th January 2006, 03:39 PM   #18
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Assuming that you are referring to D9/10, they limit the Vgs of the pass FETs during startup transients. You might get away without them, but why risk it?
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Old 19th May 2006, 05:58 PM   #19
trango is offline trango  Sweden
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My parts from the group buy has arrived and they really look great!

Thanks Coloumb!

and I've started to assemble the PSU.

Please tell me that the diodes D1-D4 is located in the wrong direction in this picture?


http://www.briangt.com/gallery/album12/DSC00412

/trango
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Old 20th May 2006, 12:11 PM   #20
Kram is offline Kram  United Kingdom
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Hello,

yes the silk screen is backwards on the PCB and so are the diodes in the photo. This only applies to the positive diodes and not the negative.

There are also some other corrections to be made, have a look at the photos earlier in this thread.

Good luck
Mark.
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