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Old 25th August 2010, 11:03 PM   #1771
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Default Cost of mods?

If one were to do all the recommended mods to this board, how much would it all cost in USD?...assuming you bought the parts to perform the mods without scavenging, or using old stock.
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Old 26th August 2010, 12:24 AM   #1772
sendler is offline sendler  United States
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Default 50

Quote:
Originally Posted by kickngas View Post
If one were to do all the recommended mods to this board, how much would it all cost in USD?...assuming you bought the parts to perform the mods without scavenging, or using old stock.
$50?
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Old 26th August 2010, 01:03 AM   #1773
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Quote:
Originally Posted by panomaniac View Post
True. The are not as efficient as they might be. Especially at low powers.
I'm very tempted to try building an Amp11, I need to practice my SMD soldering I think.

Maybe adjusting the dead time could change things a little? The heat isn't really an issue for me but it's a shame to have Class-D/T and not have it as efficient as it could be IMO.
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Old 26th August 2010, 05:26 PM   #1774
sendler is offline sendler  United States
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Originally Posted by MikeHunt79 View Post
I'm very tempted to try building an Amp11, I need to practice my SMD soldering I think.

Maybe adjusting the dead time could change things a little? The heat isn't really an issue for me but it's a shame to have Class-D/T and not have it as efficient as it could be IMO.
I would try one of these next.
.
SHOP
.
New TK2050 board
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Old 26th August 2010, 06:50 PM   #1775
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Quote:
Originally Posted by sendler View Post
I would try one of these next.
.
SHOP
.
New TK2050 board
Thanks Scott, these boards to appear to be better then the Sure boards, I am very tempted to try one to see how they compare both in terms of sound and build quality. The fact that there is no fan on the heatsink is a good thing, and it would be quite interesting to see if one board is significantly more efficient than the other.
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Old 27th August 2010, 08:54 PM   #1776
zdr is offline zdr  Belgium
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Guys, I would appreciate if someone could summarize list of mods recommended by most DIYers. Call me lazy, but I get lost each time I dive into this thread
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Old 27th August 2010, 09:08 PM   #1777
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I think this may sum it up:
Copied from Modding the Sure Electronics TK2050 2x100W Board (Part 1 of 2) The Hi-Fi Watcher
Mods applied:
Replaced the output inductors with Wuerth 4.7uH 9A rated versions
Changed the fan-based heatsink to a passive Northbridge heatsink from Zalman
Removed the on-board input resistors R14 and R34
Removed capacitors C17 and C25
Removed capacitors C16 and C24 and replaced with appropriate shorting links
Removed the input suppressors underneath the board, by the RCA inputs
Volume controlled bay a 100k Alps pot
Used 4.7uF metalised polypropylene (LCR brand) capacitors between the pot and board input
Used the manual control on the 24V SMPS to turn it up to 27.1V

Mods left to do:

Remove the polarity diodes (replacing with a short) from the DC rails on the board
Consider changing the 24V supply for a 36V supply (turned down to 32V)
Add a 0.47uF + 10 Ohm Zobel network

I think these are most of them, I am sure someone may have other mods, but this will keep you busy.
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Last edited by kickngas; 27th August 2010 at 09:10 PM.
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Old 27th August 2010, 09:52 PM   #1778
teamacc is offline teamacc  Netherlands
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Originally Posted by teamacc View Post
1. Remove input suppressors (underside of the board, look like smd diodes)
2. Replace input caps (audio1st has a great tutorial picture)
3. Use 32v
4. Remove the fan and replace the heatsink with a zm-47j northbridge cooler
5. Replace output filter, some wurth xxl coils fit right in the original space and sound great, search this thread for wurth xxl to find them
6. Replace buffer caps
7. Replace output caps

Number 1 is most important, while number 7 is least.
Might be not in (complete) correct order, but if you get to 5, you might as well do 6 and 7.
Just quoting myself
Hope this helps :P
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Old 27th August 2010, 10:46 PM   #1779
zdr is offline zdr  Belgium
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Thanks! I have some of those inductors from Vishay, will that do the trick:

Vishay - Inductors - IHLP-5050CE-07 - 5 % DCR Tolerance, Low Profile, Power Inductors
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Old 28th August 2010, 01:19 AM   #1780
sendler is offline sendler  United States
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Originally Posted by zdr View Post
Thanks! I have some of those inductors from Vishay, will that do the trick:

Vishay - Inductors - IHLP-5050CE-07 - 5 % DCR Tolerance, Low Profile, Power Inductors
Those have good specs. Also very small in height. Might be a little too wide for the pads but I'm sure you can get them on one way or another. I have found that every coil sounds different. No way to know but to try them.
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