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-   -   LC Audio low noise DC power supply (http://www.diyaudio.com/forums/power-supplies/163113-lc-audio-low-noise-dc-power-supply.html)

VT67 13th March 2010 02:52 PM

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

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 Sćterdal 16th March 2010 07:50 PM

Quote:

Originally Posted by Th3 uN1Qu3 (Post 2118501)
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 (Post 2117742)
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.


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