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Old 14th January 2007, 07:24 AM   #1
Nordic is offline Nordic  South Africa
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Default lm317 LM337 PCB file wanted

Hi, I'm looking for eagle files for and adjustable lm317/337 power supply... I built one last night but the positive rail is wacky....

I can basicaly get 4V out of it, and if I turn the pot any further it jumps to the full 28V input voltage...
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Old 14th January 2007, 08:34 AM   #2
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I had the same problem only with LM317 variable power supply...

Check if the pot is OK... I hah damaged pot...

There is also good to put 1/2W pot


Greeting,
Toni
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Old 14th January 2007, 09:01 AM   #3
Nordic is offline Nordic  South Africa
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allready swapped pots, and regulator itself... will try to swap caps later.. or maybe start by removing all of them... and putting them back one at a time...

WOULD REALY APPRECIATE A PCB FILE !
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Old 14th January 2007, 09:56 AM   #4
Nordic is offline Nordic  South Africa
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Ok, it must have been the pots... eventualy swapped with a 1W 3k3 resistor, and its pumping out 18.5V now, which I can live with... target was 15- 20 volt...
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Old 14th January 2007, 11:28 AM   #5
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perhaps this can help you

http://orca.st.usm.edu/~jmneal/dual_psu/psu2.pdf
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Old 14th January 2007, 04:07 PM   #6
Nordic is offline Nordic  South Africa
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Thats pretty close to what I settled on...
Waiting for some better quality phillips caps from the UK... So I may still remove a few, but these have been added one at a time with proper listenig using headphones.... life would be so much better with a scope, but your ears are pretty usefull too...
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Old 17th January 2007, 01:10 PM   #7
AndrewT is offline AndrewT  Scotland
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Hi Nordic,
you have omitted the decoupling caps on the regulator pins.

The circuit could oscillate without them and similar control problems may ensue.
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Old 19th January 2007, 06:43 PM   #8
Minion is offline Minion  Canada
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I use this PSU that deliver a regulated +/-15v and an Unregulated 26v (depending on the Transformer used)....

It has worked well for me .....

sorry if it looks a Bit sloppy...
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File Type: gif 15v reg-26v un-reg-psu.gif (76.3 KB, 423 views)
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Old 21st January 2007, 12:14 PM   #9
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Default !

Maybe this will help?
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File Type: pdf napajanje(raspored).pdf (26.6 KB, 235 views)
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