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Old 21st September 2005, 01:10 PM   #1
Wynand is offline Wynand  South Africa
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Default Lab Power Supply Current Limiting Q

I'm currently designing a Lab Power Supply to use for various Audio Projects.

I'm using a PC Power supply for 5 12 -5 -12 Volts for a beginning but I want the +and- 0-35v Supply to be the heart of it.

I've decided to use the LM338 T0-3 as my positive voltage regulator.
It'll also be used for the current limiting (5A should be enough limiting?)

My problem is.... do I need a current limiting circuit on the negative supply line aswell or does all the current come from the positive side(what happens at GND in respect to -V)
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Old 21st September 2005, 01:21 PM   #2
Wynand is offline Wynand  South Africa
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Heres a pic to show what I dont understand
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File Type: jpg current.jpg (28.7 KB, 132 views)
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Old 22nd September 2005, 03:08 AM   #3
ctardi is offline ctardi  Canada
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Don't quote me on this, but i think it will work with only + Limited.
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Old 23rd September 2005, 06:27 PM   #4
Nordic is offline Nordic  South Africa
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Wynand if you do manage to pull it off gimme a shout....
I'd be interested in the setup.... have a few PSU's I can pilage for parts...
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Old 27th September 2005, 10:44 PM   #5
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You DO need your current limit in both + and - supply. It is quite possible to pull current from GND to V- without any current from V+.

Proof:
Connect light bulb from GND to V-. Does it glow? Of course it does!
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