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Old 11th February 2013, 04:51 PM   #21
SY is offline SY  United States
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Quote:
Originally Posted by udailey View Post
Same with .026R 1500uf throughout just for direct comparison to last pic with 1R transformer
That looks right.
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Old 11th February 2013, 05:17 PM   #22
udailey is online now udailey  United States
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Agreed. I just wanted to show how the standard schematic simulates vs the 100r ESR. The one that looks right is the standard values.
I know PSUD is giving false values but at what point do the values stop simulating reality and start being totally false? If I sim with low ESR cap at .026R and then use the same cap with 1R or even .05R the numbers look like less noise.
So it seems like its not just with large ESR that it gives false results. Ill show you. Here is a schematic with .02 ESR, .08ESR and 100ESR caps. Each of first twoare rather normal and last is extreme but common to all is higher ESR = lower noise.
Each has better noise than the previous. Does PSUD work at all considering this?
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Last edited by udailey; 11th February 2013 at 05:33 PM.
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Old 14th February 2013, 11:52 PM   #23
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Quote:
Originally Posted by udailey View Post
Agreed. I just wanted to show how the standard schematic simulates vs the 100r ESR. The one that looks right is the standard values.
I know PSUD is giving false values but at what point do the values stop simulating reality and start being totally false? If I sim with low ESR cap at .026R and then use the same cap with 1R or even .05R the numbers look like less noise.
So it seems like its not just with large ESR that it gives false results. Ill show you. Here is a schematic with .02 ESR, .08ESR and 100ESR caps. Each of first twoare rather normal and last is extreme but common to all is higher ESR = lower noise.
Each has better noise than the previous. Does PSUD work at all considering this?
Could it be the resistance of the capacitors you have in the sim? I usually just plug in 1 Ohm there....

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Bob
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Old 15th February 2013, 03:18 AM   #24
udailey is online now udailey  United States
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Any sim I do is effected by an increase in ESR and the results are always better noise with higher ESR. Kinda backwards.
1 ohm is a lot. .026 is truly the resistance of the Rubycon ZL 1500uf 25V caps.
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Old 28th March 2013, 02:08 AM   #25
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I simulated a pp tubeamp with circuitmaker and got below 1ppm!!! thd at full power.
To bad reality wont match simulated results, but I'll settle for 100ppm
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