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Old 14th November 2002, 02:55 PM   #1
Bricolo is offline Bricolo  France
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Default Need some help with PSU Designer II

How can I put 2 capacities in parallel?

I always get an error message when I try to do this


thx
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Old 14th November 2002, 03:18 PM   #2
dhaen is offline dhaen  Europe
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I don't think you can, but...
You can just add the values and apply the total to the capacitor in circuit.
Or, add an LC or RC filter, making R or L so small as to have negligable effect.
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Old 14th November 2002, 03:28 PM   #3
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You're right John..

one just can't do it..so you can't see the effect of a bypass cap etc..it is pointless anyway trying to detect that in psu designer..I just use it for ballpark figures..

Only a good scope or a good set of ears can determine that effect..

I hope you have a good scope John, otherwise you're lost ;-)
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Old 14th November 2002, 03:52 PM   #4
Bricolo is offline Bricolo  France
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ok

since 2 smaller caps are discharging faster than a single big one (that has the same cap), it would be cool to put 2 caps in //


another question: how can I mesure my caps, selfs, and transformer resistance?
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Old 14th November 2002, 03:57 PM   #5
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The transformer you can just measure the resistance with your multimeter...

Don't know bout the rest..
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Old 14th November 2002, 04:31 PM   #6
Bricolo is offline Bricolo  France
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OK
i'll measure this when i'll be able to find the transformer...
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Old 14th November 2002, 04:36 PM   #7
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Hi Bricolo,

WRT the measuring the capacitor equivalent series resistance, take a look at this article by Walter G. Jung and Richard Marsh
from Audio Mag.http://www.capacitors.com/pickcap/pickcap.htm#signal

You'll also need a frequency generator. Dialetric absobtion requires a little more circuitry.

Rodd Yamashita
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Old 14th November 2002, 05:44 PM   #8
Bricolo is offline Bricolo  France
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I've measured 53 Ohm for the primary (230V) and 1 Ohm (!!!) for the secondary (12V)
Is this possible??
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Old 14th November 2002, 06:23 PM   #9
dhaen is offline dhaen  Europe
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Bas said:
Quote:
I hope you have a good scope John, otherwise you're lost ;-)
Tektronix TDS210:
http://www.tek.com/Measurement/cgi-bin/framed.pl?Document=http://www.tek.com/Measurement/Products/catalog/tds200/eng/specs.html&FrameSet=mbd

Only 60 MHz, samples at 1GHz, but fine for audio, and slow logic.
Can only justify the cost because I also use it to earn money!

Used to have a used Tek 453, lovely scope but too heavy.

Cheers,
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Old 14th November 2002, 06:25 PM   #10
dhaen is offline dhaen  Europe
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Bricolo wrote:
Quote:
I've measured 53 Ohm for the primary (230V) and 1 Ohm (!!!) for the secondary (12V)
Yes, absolutely typical.
The lower the DC resistance, the better.
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