I've just installed a 120mm fan into my amplifier case & the case is also vented from the sides... Should spin direction of the fan be effectively venting heat out of the case or blowing air into the case?
Hi, I went from using the included silver heatsink to the Zalman purple heatsink, only to find the Zalman heatsink gets too hot without a fan.I just wanted to give it a try. Connected to 12v it is VERY noisy. The very same fan connected to 5v is almost dead quiet even with my ear right next to the tweeter.
I'm also thinking about sticking little radiators to Wuerths coils.
I'm not using the Zalman heatsink with the Sure (MSI) fan. I'm running the fan at around 4v now, which means it makes less noise, and is still fast enough to keep the heatsink from getting hot. I did think the fan was a little noisy at 5v myself, but I do have the amp modules on the back of my speakers...
Blow
Most installations have the fan blowing outside air onto the heat source and then let it exhaust out of the case where it will.I've just installed a 120mm fan into my amplifier case & the case is also vented from the sides... Should spin direction of the fan be effectively venting heat out of the case or blowing air into the case?
Most installations have the fan blowing outside air onto the heat source and then let it exhaust out of the case where it will.
Thanks Scott
like 60-70% rather than 80-90% as class d usually is. Design issue ?
For sure. The 41Hz implementations of the same chipset hardly even need heatsinking.
I ran one of these board @24V fan-less in an unvented aluminium enclosure for three months but the stock heatsink did get get very hot, I'd estimate 50 -55C.
Coincidentally, I have been doing some tests on the new version of the board. It comes equipped with a very mechanically noisy 12V fan that plugs into a variable speed fan control that kicks in at 45C.
I am running the board @32-33.5V (to take into account the voltage lost in the input diodes) without a fan.
Ambient ~24-25C
Temperature rise:
Approx 2C every 3mins to a maximum of 52C
Temperature measured at base of heatsink:
30V 45C
32V 46-47C
34V 48-49C
Without extra cooling fins:
32V 50-51C
34V 52C
PSU:
LS75 75W 36V 2.2A
All of these measurements were taken using the Frankenstein heatsink pictured. Sorry no tests done with stock HS. I thought I could get away with a giant block of copper (old Pentium 3 server heatsink) but because the heat gain is slow but constant, a larger surface area is required to disperse the heat away from the chips. A quick blast with the fan and temp drops quickly 10C <1min.
The Zalman HS most people have been using would probably have been a better choice as It probably has a larger surface area but is too tall for my enclosure (old radio chassis).
All this suggests that to be safe I should reduce the voltage or find a quiet fan, but I'm not going to because the board sounds much better @ ~32V and I hate fans 🙂
I think that I can get the temp to stabilize at about 50C passively in its case, which is the max operating temperature stated in the Sure manual (although Tripath state 70C) but I think a quiet fan is a far more sensible solution if you are worried about heat.
My only other thought was if there was a way to detect whether there was audio input and invoke the mute if none was detected, although this might be quite annoying for PC users (system sounds etc...)
Hope this helps someone,
Mat
Coincidentally, I have been doing some tests on the new version of the board. It comes equipped with a very mechanically noisy 12V fan that plugs into a variable speed fan control that kicks in at 45C.
I am running the board @32-33.5V (to take into account the voltage lost in the input diodes) without a fan.
Ambient ~24-25C
Temperature rise:
Approx 2C every 3mins to a maximum of 52C
Temperature measured at base of heatsink:
30V 45C
32V 46-47C
34V 48-49C
Without extra cooling fins:
32V 50-51C
34V 52C
PSU:
LS75 75W 36V 2.2A
All of these measurements were taken using the Frankenstein heatsink pictured. Sorry no tests done with stock HS. I thought I could get away with a giant block of copper (old Pentium 3 server heatsink) but because the heat gain is slow but constant, a larger surface area is required to disperse the heat away from the chips. A quick blast with the fan and temp drops quickly 10C <1min.
The Zalman HS most people have been using would probably have been a better choice as It probably has a larger surface area but is too tall for my enclosure (old radio chassis).
All this suggests that to be safe I should reduce the voltage or find a quiet fan, but I'm not going to because the board sounds much better @ ~32V and I hate fans 🙂
I think that I can get the temp to stabilize at about 50C passively in its case, which is the max operating temperature stated in the Sure manual (although Tripath state 70C) but I think a quiet fan is a far more sensible solution if you are worried about heat.
My only other thought was if there was a way to detect whether there was audio input and invoke the mute if none was detected, although this might be quite annoying for PC users (system sounds etc...)
Hope this helps someone,
Mat
Attachments
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.
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
$50?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.
I'm very tempted to try building an Amp11, I need to practice my SMD soldering I think.True. The are not as efficient as they might be. Especially at low powers.
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.
Hifimediy
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SHOP
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http://www.diyaudio.com/forums/class-d/164274-new-tk2050-board.html
I would try one of these next.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.
.
SHOP
.
http://www.diyaudio.com/forums/class-d/164274-new-tk2050-board.html
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. 🙂I would try one of these next.
.
SHOP
.
http://www.diyaudio.com/forums/class-d/164274-new-tk2050-board.html
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 🙂
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.
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.
Last edited:
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 😛
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
Vishay - Inductors - IHLP-5050CE-07 - 5 % DCR Tolerance, Low Profile, Power Inductors
Vishay coils
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.
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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