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Old 14th August 2006, 03:12 AM   #1
jarthel is offline jarthel  Australia
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Default when using PSUD2, do you...

change the resistance value in the caps? It's always defaulted to 2 and I always thought that this resistance must be changed to the ESR rating of the capacitor.

Thank you.
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Old 14th August 2006, 03:59 AM   #2
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Default ESR

During a recent project I did change the ESR value only due to the fact that I was using a Black Gate cap and the ESR was very low on the order of .1 ohm or lower.




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Old 14th August 2006, 07:38 AM   #3
EC8010 is offline EC8010  United Kingdom
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Nip along to Dick Smith's and buy the capacitor ESR meter kit. I received mine two weeks ago. It took me three hours to build and worked first time. I got it specifically for PSUD2...
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Old 14th August 2006, 07:53 AM   #4
jarthel is offline jarthel  Australia
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Quote:
Originally posted by EC8010
Nip along to Dick Smith's and buy the capacitor ESR meter kit. I received mine two weeks ago. It took me three hours to build and worked first time. I got it specifically for PSUD2...

thanks for the tip
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Old 14th August 2006, 03:30 PM   #5
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EC,

Please help me to "nip along". Is there a link to Dick Smith's?
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Old 14th August 2006, 03:35 PM   #6
jarthel is offline jarthel  Australia
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Quote:
Originally posted by Brian Beck
EC,

Please help me to "nip along". Is there a link to Dick Smith's?

It's an australian electronics shop (which has ventured to selling pcs and other audio/video goods in the last few years).

not sure if they ship overseas though


www.dse.com.au
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Old 14th August 2006, 05:17 PM   #7
EC8010 is offline EC8010  United Kingdom
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Hello Brian,

truth be told, I didn't actually "nip along" myself, but a friend in Oz got one for himself, mentioned it to me and I asked him to get me one in return for sending him some British goodies. I gather that Dick Smith have sold quite a few (12,000) of these ESR meters, and some abroad.
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Old 14th August 2006, 06:15 PM   #8
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If you experiment, and change the cap resistance value from .001 ohms to even 2 or 5, it really doesn't seem to change too much in terms of the voltage curve, so i don't sweat it . the thing i've learned to always measure is a) unloaded voltage on secondaries and b) winding resistance. those have SO much more of an effect.
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Old 14th August 2006, 06:59 PM   #9
EC8010 is offline EC8010  United Kingdom
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Capacitor ESR doesn't change the voltages very much but it has a major effect on ripple currents, especially in capacitor input filters. It's very important to check ripple currents to make sure you're not exceeding choke or capacitor current ratings.
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Old 15th August 2006, 12:34 AM   #10
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Thanks guys. I should have Googled before asking you. There is at least one US vendor for this item.

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