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Old 3rd June 2005, 10:52 PM   #1
Htguy is offline Htguy  United States
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I am looking to build a linear power supply for a project of mine and I need a +5, -5, +15 and -15 supply. It was suggested that I use LM338t's for each but the 338t does not list it for use as a - regulator. (I am some what green at this) Anyhow am I missing something? Is there a way I can make the - supplies with the 338t?


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Old 4th June 2005, 01:28 AM   #2
SY is offline SY  United States
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Location: Chicagoland
Linear power...
I'll move this over to the Power Supply area where you'll probably get better response.
"You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is."
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Old 4th June 2005, 07:23 AM   #3
Danko is offline Danko  Hungary
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7805 is a fixed +5V regulator, 7905 is a fixed -5V regulator, and 7815 and 7915 are +15V and -15V reguators
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Old 4th June 2005, 08:15 AM   #4
AndrewT is offline AndrewT  Scotland
Join Date: Jul 2004
Location: Scottish Borders
you could also use 317/337 for +- supplies.
However you can cascade two positive supplies connecting the +ve out of one to the negative output of the other and using this common as your earth/ground/common return.
To do this you need two separate windings on your transformer and then two separate rectifiers. Do not common any of the wiring before the outputs of the regulators.
I hear that the performance of the +ve reg. is better than the -ve and that this cascading gives an overall improvement.
I have never built one but coming soon.
You could assemble a much cheaper 5A supply if you used a 1A or 1.5A reg. with booster transistor or FET as shown in the data sheets.
regards Andrew T.
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