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steevo 4th July 2007 08:12 PM

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

bigwill 4th July 2007 08:29 PM

NOTE: I am a newbie

How about pre-regulating?

steevo 4th July 2007 08:34 PM

power supply
 
I never thought of that, will it work.

Steevo

Nordic 4th July 2007 08:50 PM

If it is below 35V, search using preregulator as the search term and my Nic in the right box...

sawreyrw 4th July 2007 09:20 PM

1 mV of ripple is not worth worrying about.

steevo 4th July 2007 09:34 PM

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.

Steevo

peranders 4th July 2007 09:57 PM

Steevo, have you hum with any load?

bigwill 4th July 2007 09:58 PM

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

steevo 4th July 2007 10:34 PM

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

Steevo

Leolabs 5th July 2007 03:32 AM

What's the size/value of the filtering caps???


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