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Old 4th July 2007, 07:12 PM   #1
steevo is offline steevo  United Kingdom
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Default too much ripple

I have built my regulated power using the LM337 and 317 and made the changes as suggested but still get about 1mv of ripple at the ouput. This also appears at the preamp supply pins even with onboard suppression and its appearing at the output as a low hum. The ripple occurs about evey 8ms. Is this the best that I am likely to get from these regulators. The ripple at the reg input is about 38mv pk-pk Has anyone had anything better from these.

Steevo
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Old 4th July 2007, 07:29 PM   #2
bigwill is offline bigwill  United Kingdom
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How about pre-regulating?
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Old 4th July 2007, 07:34 PM   #3
steevo is offline steevo  United Kingdom
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Default power supply

I never thought of that, will it work.

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Old 4th July 2007, 07:50 PM   #4
Nordic is offline Nordic  South Africa
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If it is below 35V, search using preregulator as the search term and my Nic in the right box...
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Old 4th July 2007, 08:20 PM   #5
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1 mV of ripple is not worth worrying about.
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Old 4th July 2007, 08:34 PM   #6
steevo is offline steevo  United Kingdom
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Default ripple

1mv seems to have an effect on my preamp, the low level ripple is audible through my power amp when I cobbect it to my preamp. I thought the Ne5532 opamps PSRR would have taken care of 1mv but it doesnt seem to have. When I turn of the transformer the ripple and therefore the noise dissapear. Apparently because of the high gain inside the feedback loop they are very sensitive to noise.

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Old 4th July 2007, 08:57 PM   #7
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Steevo, have you hum with any load?
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Old 4th July 2007, 08:58 PM   #8
bigwill is offline bigwill  United Kingdom
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Default Re: ripple

Quote:
Originally posted by steevo
1mv seems to have an effect on my preamp, the low level ripple is audible through my power amp when I cobbect it to my preamp. I thought the Ne5532 opamps PSRR would have taken care of 1mv but it doesnt seem to have. When I turn of the transformer the ripple and therefore the noise dissapear. Apparently because of the high gain inside the feedback loop they are very sensitive to noise.

Steevo
Are you sure you don't have some kind of earth loop? Opamps are very good at rejecting supply noise
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Old 4th July 2007, 09:34 PM   #9
steevo is offline steevo  United Kingdom
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Default Regulator ripple

I could have an earth loop, not sure how i go about detecting where it is though.

Steevo
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Old 5th July 2007, 02:32 AM   #10
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What's the size/value of the filtering caps???
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