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Old 12th June 2012, 07:08 PM   #141
massimo is offline massimo  Italy
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Quote:
Originally Posted by jean-paul View Post
... we are still looking for other (discrete) solutions.....
... and why not consider a TO220 5 pin reg featuring output noise as low as 40uVrms from 10Hz to 100 kHz?
Unfortunately it's an LDO
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Old 12th June 2012, 07:43 PM   #142
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Hi I just spoke to Subbu and it seems like we are going that direction. In fact I already have a design finished based on LM723. It is a complete power supply (so with transformer) and Subbu is testing a similar power supply. Not being very easy satisfied we are exploring other solutions too. IMO it is beneficial to have it all on one PCB for safety and easy building.

Please think of the extra waiting time for possible participants and handling on our part. We are not making it easier on ourselves by adding a possible extra group buy


Quote:
Originally Posted by massimo View Post
... and why not consider a TO220 5 pin reg featuring output noise as low as 40uVrms from 10Hz to 100 kHz?
Unfortunately it's an LDO
40 uV is a lot compared to the 2.5 uV of the LM723.... No problems with LDO regs as long as they're not noisy. When we design a nice low noise supply it can be used for other purposes too.
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Last edited by jean-paul; 12th June 2012 at 08:09 PM.
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Old 12th June 2012, 08:01 PM   #143
ryanj is offline ryanj  Australia
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Originally Posted by jean-paul View Post
. We are also willing to know how many of the group buy participants would like to have a power supply PCB too. For calculating Rsc please see data sheet of LM723.
Count me in for a power supply pcb.

Ryan
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Old 12th June 2012, 08:07 PM   #144
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Where's the spreadsheet guy ?
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Old 12th June 2012, 08:10 PM   #145
massimo is offline massimo  Italy
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Quote:
Originally Posted by jean-paul View Post
40 uV is a lot compared to the 2.5 uV of the LM723.....
Yes, but 2.5uV from 100 Hz to 10 kHz
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Old 12th June 2012, 08:13 PM   #146
massimo is offline massimo  Italy
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P.S. count me in for a PS pcb Even if the dac pcb will be delayed.
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Old 12th June 2012, 08:14 PM   #147
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Yes, but 2.5uV from 100 Hz to 10 kHz
You are right. But your ears won't hear beyond 10 kHz because of that loud Italo disco you listed to in high school

http://www.youtube.com/watch?v=VdnFKxk1JjM
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Last edited by jean-paul; 12th June 2012 at 08:17 PM.
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Old 12th June 2012, 08:17 PM   #148
massimo is offline massimo  Italy
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I'm minding noise injected to the Xo

Anyway, take a look at LT3080
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Old 12th June 2012, 08:18 PM   #149
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You forget the onboard regs, those are pretty low noise... I used LT3080 before and I dislike it putting out full input voltage at too low loads. There are better regs around but the best of them are discrete I think.
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Last edited by jean-paul; 12th June 2012 at 08:36 PM.
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Old 13th June 2012, 05:49 AM   #150
pchw is offline pchw  United States
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Originally Posted by jean-paul View Post
Where's the spreadsheet guy ?
Yes, sir!!
The spreadsheet is updated with a Power Supply PCB Interest column.

Fellow GB members, find your name and add the number of pcb's you are interested in.

Kudos to Subbu and Jean-Paul!!
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