Getting + 5V after regulated +/- 15V psu - Use LM7805 or LM317? - diyAudio
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Old 24th September 2008, 03:08 PM   #1
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Default Getting + 5V after regulated +/- 15V psu - Use LM7805 or LM317?

From a LM317/337 balanced psu giving +/- 15V i want to take + 5V using an LM7805 or another LM317. Is is worth the hazzle (not much, I know ...) to use LM317 or just pop in a LM7805? Is there a difference noisewise?

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Old 24th September 2008, 03:31 PM   #2
AndrewT is offline AndrewT  Scotland
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just use a 7805 for your +5V supply.
But, it adds load to your 15V supply and will increase the dissipation of the 317.
Alternatively, run the 7805 off the unregulated supply, if the 7805 can take the dissipation.
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Old 24th September 2008, 08:11 PM   #3
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Default Re: Getting + 5V after regulated +/- 15V psu - Use LM7805 or LM317?

Quote:
Originally posted by SmellOfPoo
*snap*
Is there a difference noisewise?

Thanks!
Try checking the manufacturers' datasheet, there should be information on the noise issues. I remember having read some day that the adjustable LM317 would generate less noise under certain circumstances, but I'm not sure.

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