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Old 11th February 2013, 03:52 PM   #11
DF96 is offline DF96  England
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With 40mF of smoothing it should not matter what he puts in series with 100uF in the middle. It does matter so PSUD2 has a weakness here.
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Old 11th February 2013, 03:53 PM   #12
udailey is online now udailey  United States
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thought this might help.
1k5u with 1R and then with 100R ESR
.22u with 100R ESR
.22u with 1R ESR
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Old 11th February 2013, 03:58 PM   #13
udailey is online now udailey  United States
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It happens with any load and with different capacitances. See here.
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Old 11th February 2013, 04:06 PM   #14
SY is offline SY  United States
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Get rid of that zero ohm resistor.
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Old 11th February 2013, 04:09 PM   #15
udailey is online now udailey  United States
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So this one, for instance, hits pico noise. I have got into low femto messing with the numbers on a different try.
Anyway,aside from these extreme examples, is there any truth to the results, for instance when a cap has 1R ESR because even that value could be achieved with junk caps or a resistor in series with the cap?
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Old 11th February 2013, 04:19 PM   #16
udailey is online now udailey  United States
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Okay. Rid of 0R
So same psu. 1500u cap with .026R and then 100R
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Old 11th February 2013, 04:23 PM   #17
SY is offline SY  United States
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18R transformer?
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Old 11th February 2013, 04:27 PM   #18
udailey is online now udailey  United States
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Doesnt seem to matter much. Here's 1R. OK it matters but the answer is similar.
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Old 11th February 2013, 04:39 PM   #19
udailey is online now udailey  United States
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Sorry, last pic was wrong. Here it is with the 1R transformer and correct values plus 100R ESR 1500u cap
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Old 11th February 2013, 04:42 PM   #20
udailey is online now udailey  United States
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Same with .026R 1500uf throughout just for direct comparison to last pic with 1R transformer
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