(re)searching for a better preamp

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#501
rudi said:
Hi Safetyman. i have replied to your mail. thanks very much. i have a feeling that you are not receiving my mails
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rudi, something strange is happening. I just received a copy of the mail you sent to me when you received the package. 😕 and there's no other mail from you, and the same from t. too. Wonder which side of the telcos is screwing up. :scratch:
 
#503
Hey is t. about?

I want to hear his impressions of the SMPS version of Rudis board. I have been chopping up Rudi's bottom board in photoshop for the last few hours removing the PSU and shortening the signal path on the board bottom board.

Ok its a quite day here and i am bored!!!

I was just wondering whether to etch it or not.

Phil
 
#507
Thanks Nuuk,

I might give it a go anyway, and to be honest i will try it with one SMPS. I would have thought that a 1amp -12v rail would be enough for an opamp, even one this beefy surely. I mean the maximum is 400 milliamps per channel so a total of 800 mill amps but thats got to be shared on the plus and the minus rails hasnt it?

Phil
 
#508
I also would have thought that one SMPS is man enough for an opamp!

I know some people report an improvement with a linear supply running from a transformer that is much larger than is required but I believe that is for reasons other than the higher current supply! (Don't ask) 😉
 
#509
Nuuk said:
I also would have thought that one SMPS is man enough for an opamp!

I know some people report an improvement with a linear supply running from a transformer that is much larger than is required but I believe that is for reasons other than the higher current supply! (Don't ask) 😉
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Well I believe that each one of us have our eccentricities.

But you can increase and increase and have no change. But once you go WAY over what is considered adequate, only then do you start to hear a difference but sadly it is so small that it really isn’t worth the money you send to get there. But if you have the option to do so, by all means go ahead.
 
#516
filholder said:
Hey is t. about?

I want to hear his impressions of the SMPS version of Rudis board. I have been chopping up Rudi's bottom board in photoshop for the last few hours removing the PSU and shortening the signal path on the board bottom board.

Ok its a quite day here and i am bored!!!

I was just wondering whether to etch it or not.

Phil
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http://www.diyaudio.com/forums/showthread.php?postid=857768#post857768

The AD815 seems to be a bit current hungry, theres also a pair of op-amps for the nulling so I'd prefer to go over kill:devilr:
 
#518
t. said:
The AD815 seems to be a bit current hungry, theres also a pair of op-amps for the nulling so I'd prefer to go over kill:devilr:
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Take it easy Leo, we are talking some tens of ma. 😀
Hey, talking of which, it has a quiescent current of ~55ma at +/-15V, that's higher than some power op-amps. 😱
Higher than an LM3886 at the same PSU voltage. 😎
 
#519
Sorry guys, didn't mean to confuse😉
I'm currently using Rudi's layout which uses the AD815 plus a servo for the nulling (a pair of OPA132's) before the dual regs etc was tried the single LM317/337 used to get fairly warm especially if the pre was left idle. (yes it is heatsinked)
I've been trying a few different psu's including the SMPS, I actually have a pair of these so decided I may as well use them both rather than just one.

I've noticed a few guys using these AD815 as headphone amps too which I'd like to try if possible
 
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