LC Audio low noise DC power supply

VT67 · 13th March 2010, 02:52 PM

I was wondering if this would be a good alternative to replace the wall-wart of a Squeezebox Duet. Anybody here who has some experience with this power supply.

L C Audio Technology / Low-noise Regulator

Regards

Beepbeep57 · 13th March 2010, 03:27 PM

Hello!

First post here!
I've built this power supply for an active filter: big noise at négative output rail! And with +/- 15Vac in, the poor NE 5532 will die quickly with no load: select +/-24V OPAmp like OPA2604.

Regards

Didier

Th3 uN1Qu3 · 14th March 2010, 10:22 AM

It looks a little complicated to me. I'd just go with the good old LM317 and LM337. There was a document around with a study on optimum capacitors for those regulators, but i don't remember where it was (i'm sure people here know it though). If no one else remembers it i'll look around for it.

Erlend Sæterdal · 16th March 2010, 07:50 PM

Quote:

Originally Posted by Th3 uN1Qu3

It looks a little complicated to me. I'd just go with the good old LM317 and LM337. There was a document around with a study on optimum capacitors for those regulators, but i don't remember where it was (i'm sure people here know it though). If no one else remembers it i'll look around for it.

Yes LM 317 / 337 are old but not good.

Discret regulation sounds 10 times better.

peranders · 16th March 2010, 08:00 PM

Quote:

Originally Posted by Beepbeep57

Hello!

First post here!
I've built this power supply for an active filter: big noise at négative output rail! And with +/- 15Vac in, the poor NE 5532 will die quickly with no load: select +/-24V OPAmp like OPA2604.

Regards

Didier

Did you built it properly? I have a hard time to believe that the NE5532 would die if you had a proper supply voltage. I can see the low margin though.

davidsrsb · 17th March 2010, 03:32 PM

No filtering on the op-amp power lines. High frequency noise on the mains will go straight through this
I hope that the trimmer is not microphonic

Beepbeep57 · 17th March 2010, 06:01 PM

Hi peranders.

I naturally think of having realized the assembly correctly! Concerning the NE5532, it supports at most + /-22V, thus with 15Vac, we are close to his maximal voltage, where from the risk of strain.

13th March 2010, 02:52 PM	#1
VT67 diyAudio Member Join Date: Jun 2004 Location: Belgium	LC Audio low noise DC power supply I was wondering if this would be a good alternative to replace the wall-wart of a Squeezebox Duet. Anybody here who has some experience with this power supply. L C Audio Technology / Low-noise Regulator Regards __________________ VBITNGC Krell KSA-50 Krell KSA-100MkII

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13th March 2010, 03:27 PM	#2
Beepbeep57 diyAudio Member Join Date: Feb 2009	Hello! First post here! I've built this power supply for an active filter: big noise at négative output rail! And with +/- 15Vac in, the poor NE 5532 will die quickly with no load: select +/-24V OPAmp like OPA2604. Regards Didier

14th March 2010, 10:22 AM	#3
Th3 uN1Qu3 diyAudio Member Join Date: Feb 2010 Location: Bucharest	It looks a little complicated to me. I'd just go with the good old LM317 and LM337. There was a document around with a study on optimum capacitors for those regulators, but i don't remember where it was (i'm sure people here know it though). If no one else remembers it i'll look around for it.

17th March 2010, 03:32 PM	#6
davidsrsb diyAudio Member Join Date: Dec 2005 Location: Kuala Lumpur	No filtering on the op-amp power lines. High frequency noise on the mains will go straight through this I hope that the trimmer is not microphonic

17th March 2010, 06:01 PM	#7
Beepbeep57 diyAudio Member Join Date: Feb 2009	Hi peranders. I naturally think of having realized the assembly correctly! Concerning the NE5532, it supports at most + /-22V, thus with 15Vac, we are close to his maximal voltage, where from the risk of strain.

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