when using PSUD2, do you...

jarthel · 14th August 2006, 02:12 AM

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.

tenderland · 14th August 2006, 02:59 AM

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.

Jf

EC8010 · 14th August 2006, 06:38 AM

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...

jarthel · 14th August 2006, 06:53 AM

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

Brian Beck · 14th August 2006, 02:30 PM

EC,

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

jarthel · 14th August 2006, 02:35 PM

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

EC8010 · 14th August 2006, 04:17 PM

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.

sorenj07 · 14th August 2006, 05:15 PM

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.

EC8010 · 14th August 2006, 05:59 PM

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.

Brian Beck · 14th August 2006, 11:34 PM

Thanks guys. I should have Googled before asking you. There is at least one US vendor for this item.

Anatek

14th August 2006, 02:12 AM	#1
jarthel diyAudio Member Join Date: Jan 2002 Location: somewhere in Australia	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.

14th August 2006, 02:59 AM	#2
tenderland diyAudio Member Join Date: Jul 2004 Location: us	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. Jf __________________ "If every one is making wheels , why make wheels ? " Steve Jobs

14th August 2006, 06:38 AM	#3
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	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... __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

14th August 2006, 02:30 PM	#5
Brian Beck diyAudio Member Join Date: Dec 2004 Location: South Florida, USA	EC, Please help me to "nip along". Is there a link to Dick Smith's? __________________ Brian

14th August 2006, 04:17 PM	#7
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	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. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...


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14th August 2006, 05:15 PM	#8
sorenj07 diyAudio Member Join Date: May 2006	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.

14th August 2006, 05:59 PM	#9
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	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. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

14th August 2006, 11:34 PM	#10
Brian Beck diyAudio Member Join Date: Dec 2004 Location: South Florida, USA	Thanks guys. I should have Googled before asking you. There is at least one US vendor for this item. Anatek __________________ Brian

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