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LC Audio low noise DC power supply
LC Audio low noise DC power supply
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Old 13th March 2010, 02:52 PM   #1
VT67 is offline VT67  Belgium
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Default 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

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Old 13th March 2010, 03:27 PM   #2
Beepbeep57 is offline Beepbeep57  France
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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
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Old 14th March 2010, 10:22 AM   #3
Th3 uN1Qu3 is offline Th3 uN1Qu3  Romania
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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.
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Old 16th March 2010, 07:50 PM   #4
Erlend Sæterdal is offline Erlend Sæterdal  Denmark
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LC Audio low noise DC power supply
Quote:
Originally Posted by Th3 uN1Qu3 View Post
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.
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Old 16th March 2010, 08:00 PM   #5
peranders is offline peranders  Sweden
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LC Audio low noise DC power supply
Quote:
Originally Posted by Beepbeep57 View Post
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.
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Old 17th March 2010, 03:32 PM   #6
davidsrsb is offline davidsrsb  Malaysia
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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
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Old 17th March 2010, 06:01 PM   #7
Beepbeep57 is offline Beepbeep57  France
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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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