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 Forum index » DIY Hardware and Software » MusicFromOuterSpace.com designs by Ray Wilson
LM317/337 Adjustable power supply not working
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WooDaWii



Joined: Jul 12, 2014
Posts: 7
Location: Quebec city

PostPosted: Wed Aug 06, 2014 9:41 pm    Post subject: LM317/337 Adjustable power supply not working Reply with quote  Mark this post and the followings unread

I'm currently building an adjustable power supply to get +/-15V. It's connected to a 120V to 36V secondary tap transformer (+18V, 0V, -18V) and when I plug it it nothing happens and when I unplug it the caps discharge into the output starting at around 12V. I pretty much verified and double checked everything I could and I can't seem to make it work. Help would be greatly appreciated.

here's the link to MFOS page http://www.musicfromouterspace.com/forums.html?MAINTAB=SYNTHDIY&PROJARG=POWERSUPPLY2009/POWERSUPPLY2009.php&VPW=1430&VPH=602
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prgdeltablues



Joined: Sep 25, 2006
Posts: 180
Location: UK
Audio files: 11

PostPosted: Thu Aug 07, 2014 1:33 am    Post subject: Reply with quote  Mark this post and the followings unread

First thought is to triple check the orientation of the regulators - note the pinouts are different on the +ve and -ve regulators. Are you getting any voltage at the input pins -should be roughly + and - 17V? Earth connections all good? Do the trimmers have any effect?

You could try disconnecting, say, the -ve regulator, and just get the positive one working first.

Just some thoughts.

Peter
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WooDaWii



Joined: Jul 12, 2014
Posts: 7
Location: Quebec city

PostPosted: Thu Aug 07, 2014 8:19 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for the insight! I kind of assumed the pinouts would be the same so I'm pretty sure that's the problem. I'll try to get it working
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WooDaWii



Joined: Jul 12, 2014
Posts: 7
Location: Quebec city

PostPosted: Thu Aug 07, 2014 9:00 am    Post subject: Reply with quote  Mark this post and the followings unread

Verified the pin out and it matched, it turned out to be a cut trace. Thanks for your help though!
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