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Old 20th October 2009, 07:58 AM   #611
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Thanks for that, I thought one of those two values would work.

Terry
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Old 20th October 2009, 08:09 AM   #612
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Quote:
Originally Posted by ElFishi View Post
Very nice. Finally someone sporting a Zalman.
What filter caps do you use for the output?
thank you
Zalman's suitable ones
(northbridge coolers ZM-NB32K ::: Zalman, leading the world of Quiet Computing Solutions ::: and ZM-NB47J ::: Zalman, leading the world of Quiet Computing Solutions :::) are twice and 3 times the weight oh original heatsink,
but Zalmans are 37x37 mm. of base,
unfortunnately non completely covering the two TP2050 chips
Click the image to open in full size. Click the image to open in full size.
but i don't think this uncovered 1.5mm. (both the sides) will cause heating problems..
03_dis10 - Servimg.com - Free image hosting service
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in the next days, i'll be able to provide ZM-NB32K photos, i have to move to it because ZM-NB47J is 2mm. higher than my maximum permitted..
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Old 20th October 2009, 11:09 AM   #613
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Quote:
Originally Posted by ElFishi View Post
What filter caps do you use for the output?
forgot this part..
well, i used 10mH - 470nF - 100nF , as stated in the Notes of TK2050 DS (and formerly "ok tested" by other users of T-Forum)
Inductors from ArjenHelder, Caps are Epcos MKP from RS.

i didn't mount Zobel network, because i'm not sure on electrical parameters of my speakers, so i can't calculate right values for Cz and Rz..
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Old 20th October 2009, 11:36 AM   #614
sendler is offline sendler  United States
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Default Fanless will sound better

Quote:
Originally Posted by madqwerty View Post
in the next days, i'll be able to provide ZM-NB32K photos, i have to move to it because ZM-NB47J is 2mm. higher than my maximum permitted(
I will go back to fanless as well. Newegg has the smaller heatsinks for only $4.00 in the USA which will be cheaper than adding the additional power supply I am using to isolate the fan noise from the 5v supply.
.
Newegg.com - ZALMAN ZM 32K Heatsinks only - Memory & Chipset Cooling
.
I think the original little fanless heatsinks would have worked fine if Sure had used some Arctic Alumina to glue them on with rather than the rubbery stuff that was there. The chips were sometimes getting much hotter than the sinks. Though you would never get the epoxy off again if the chips needed a repair. Your spring clips will be nicer for that reason. As long as I had the heatsink off, I might also try tinning the legs of the output chips with some solder to increase the effective guage. They are very light guage for a power chip.
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Old 20th October 2009, 12:17 PM   #615
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Originally Posted by sendler View Post
I think the original little fanless heatsinks would have worked fine if Sure had used some Arctic Alumina to glue them on with rather than the rubbery stuff that was there
yes, you're right..
i didn't try by myself, but many T-Forum users (don't know if also some diyAudio user) have cleaned everything from this stupid rubbery and remounted the original heatsink with the proper thermal grease, and experienced strong enhancements on heat dissipation, so they won't upgrade their heatsinks, because they remain quite warm..
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Old 20th October 2009, 01:25 PM   #616
sendler is offline sendler  United States
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Default T-Forum?

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Originally Posted by madqwerty View Post
but many T-Forum users
.
Where is the T-Forum? Link?
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Old 20th October 2009, 02:05 PM   #617
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madqwerty, what method are you using to charge those in-series batteries? How are you liking the sound, btw?
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Old 20th October 2009, 02:14 PM   #618
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Quote:
Originally Posted by sendler View Post
.
Where is the T-Forum? Link?
our little forum, T-Class focused but rapidly growing on diy-side
unfortunnatelly for you, it's in italian (but many of us can write in english, if you've to ask something)
main page Forum gratis : T-Forum :: T-Class, HiFi revolution
SureTK related threads :
- nuova scheda sure (first introductive thread )
- Sure electronics TK2050 le MODIFICHE (more tweaking & diy focused)
and much other things..enjoy !
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Old 20th October 2009, 02:19 PM   #619
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Originally Posted by soldersmoker View Post
madqwerty, what method are you using to charge those in-series batteries? How are you liking the sound, btw?
hi,
i'm using a Regulated Power Supply, with V ranging 0-100Vdc , and I ranging from 0 to 900mA, both configurable.

I like the theory who wants Pb Gel / SLA batteries to be charged like NiMh, so
Max V = Nominal V * 1.15
Max I = C / 10

so, for a single 12V/7Ah battery, i use Vmax=13.8V and Imax=0,7A.

Due to the high voltage limit of my supply, i can recharge more batteries connected in series, with the same rule : Vmax = 13,8 x Nun. of batteries connected, and Imax = 0,7A..

Don't know if it's a good method, my SLA batteries seem to like it


sounding : unfortunnately, i didn't have extended tests with smps because of its noisy and annoying fan, i use batteries because i have them, and i sold the noisy smps...i can report a slight sensation of more clean , "stable" and focused sound, but i made fast comparations only on the "factory default" SureTK, months ago..sorry!

Last edited by madqwerty; 20th October 2009 at 02:25 PM.
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Old 20th October 2009, 04:11 PM   #620
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Those are solid calculations for recharging, I think. I'm also using a 7Ah battery and will pick up another one soon to put in series. I'm still waiting for my Sure board--almost two weeks now.
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