Rolling different brands both of 10.000uF 63V caps in PSU I have to adjust the regulator because when one is adjusted to Vout 12V and change for the other brand the Vout is 11.90V, why this difference of voltage: is due to the fact of ESR so one cap have less resistance then the other?
I guess not because is always in the same box.
I mind not because I changed several times with the same test conditions only differente between the two caps: one 85ºC other 105ºC, can be the reason?
No,
you changed the test conditions.
Was the regulator stable in both set ups?
Did instability get prompted by a different impulse from the PSU?
you changed the test conditions.
Was the regulator stable in both set ups?
Did instability get prompted by a different impulse from the PSU?
Only changed the cap and trimmed Vout to 12V.
The regulator is stable with both caps the only difference is that one cap needs to increase the more the Vout with the trimmer.
The regulator is stable with both caps the only difference is that one cap needs to increase the more the Vout with the trimmer.
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Any of the two caps make the reg oscillates, when I adjust with the trimmer the Vout don't change in both set ups.
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Is this an SMPS or a linear regulator?
Is the capacitor you are talking about at the input or the output?
Maybe it would help if you show a circuit or give a link, so we know what sort of power supply you're talking about.
Is the capacitor you are talking about at the input or the output?
Maybe it would help if you show a circuit or give a link, so we know what sort of power supply you're talking about.
And you are making a big thing out of a 0.8% difference.
I very very much doubt the circuit you are feeding from that supply notices any difference.
And maybe the difference is even smaller than 0.1V , simply your digital meter *must* choose between displaying 11.9 and 12.0
Actual difference might be a couple hundredths of a mV, simply one resides on one side of the threshold, the other voltage on the opposite one.
Joys of digitizing values.
I very very much doubt the circuit you are feeding from that supply notices any difference.
And maybe the difference is even smaller than 0.1V , simply your digital meter *must* choose between displaying 11.9 and 12.0
Actual difference might be a couple hundredths of a mV, simply one resides on one side of the threshold, the other voltage on the opposite one.
Joys of digitizing values.
Linear regulator.
The cap is the mains filter.
I'm sorry I can't post the schematic (have copyrights).
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