Okay...dumb questions...
Is that a se to differential buffer with volume control?
I assume two would be needed?
Mike
Is that a se to differential buffer with volume control?
I assume two would be needed?
Mike
One circuit for each bridged channel, yes. You obviously wouldn't need the lowest opamp if you're driving a single ended channel.
Cooling for TPA3255EVM.
What sort of cooling is required for this board? It has a huge heatsink. I have driven it hard for a few hours and its mildly warm. Though my amp is sitting out in the open. Wondering if I put this in a ventilated case, will I still need a small fan?
Thanks
What sort of cooling is required for this board? It has a huge heatsink. I have driven it hard for a few hours and its mildly warm. Though my amp is sitting out in the open. Wondering if I put this in a ventilated case, will I still need a small fan?
Thanks
i am amazed that you would consider that heatsink huge. its a 600watt amp!!
the heatsink is tiny for such a power output. and actually undersized for the proper utilisation of that power. you need to dissipate circa 60-80 watts worst-case-scenario.. that heatsink without fan is probably good for 15-20w.
the heatsink is tiny for such a power output. and actually undersized for the proper utilisation of that power. you need to dissipate circa 60-80 watts worst-case-scenario.. that heatsink without fan is probably good for 15-20w.
To honor the mod's request on the split, I'm pulling this over to this thread.
Really depends on use case, as, unless you're pushing the system pretty hard, the amount of waste heat will be pretty close to quiescent levels. That said, using something like a 120mm San Ace (9S1212L4D011 Sanyo Denki | Mouser) might well be able to run right off the 12V tap available (might be too much current draw?) and move more than enough air very quietly. Just make sure that you mount the fan vertically, not horizontally.
Edit to add: Nidec Gentle Typhoons or some of the lower CFM Noctuas would probably work. Might as well steal from the quiet PC crowd!
Really depends on use case, as, unless you're pushing the system pretty hard, the amount of waste heat will be pretty close to quiescent levels. That said, using something like a 120mm San Ace (9S1212L4D011 Sanyo Denki | Mouser) might well be able to run right off the 12V tap available (might be too much current draw?) and move more than enough air very quietly. Just make sure that you mount the fan vertically, not horizontally.
Edit to add: Nidec Gentle Typhoons or some of the lower CFM Noctuas would probably work. Might as well steal from the quiet PC crowd!
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Perhaps the rule of thumb for whether or not you need a fan goes something like this: if you listen at such loud volume that a fan would not be heard, you might need a fan; for reasonable SPL of music, a fan is unlikely to be necessary.
Define "ventilated case", mounting orientation, load-Impedance, "hard", ambient temperature, barometric pressure..
You will need to try but chances are good that it works like so. Otherwise you may do the math like shown here:
http://www.diyaudio.com/forums/class-d/276982-tpa3251d2.html#post4391686
But with taking heat transport into account.
As long as the overtemp LED isn't coming up you should be fine.
You will need to try but chances are good that it works like so. Otherwise you may do the math like shown here:
http://www.diyaudio.com/forums/class-d/276982-tpa3251d2.html#post4391686
But with taking heat transport into account.
As long as the overtemp LED isn't coming up you should be fine.
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I am still exploring for a case for the amp. I will put a 80mm on the back of the case or may be 120mm on the top of the case once I have decided on the case. I bought two of these amps to run in mono mode along with two SE-600-48. So I guess I need to definitely aircool the amps. I am planning to keep the power supplies in separate case and the two amps in separate case. I know it defeats the whole purpose of monoblocks, but it's due the space constraints.
Make sure you look carefully at what the bearing system is if you place the fan horizontally. It's a surefire way to make them die quickly.
This is what I used in the Americas....
19" Rack Mount Steel Chassis, 2U Height and 300mm Deep
A 2u case and the amp fit well and ventilated. Don't know if the SE-600 will fit or not.
How are you able to fit the amp in a 2U? I checked and with the riser and capacitor at the bottom and heatsink at the top, the amp height is more than 4". The SE-600 is only 2.5" height.
My TP3255EVM is 3" tall. The case is approx 3 1/4" on the inside. Maybe your standoffs are longer??
I have to measure again at home. Also, I may not be able to fit two power supply and two amps in there. I will need a deeper case.
Thanks
They have a 300mm and a 350mm deep case. The 300mm 3u case is only $10 more and 4.7" tall. I believe the 300mm deep cases are shipped assembled and the shipping was a bit much. Like $14 bucks.
New 3U Rackmount Enclosure ET3/35B - Electronic Enclosures | Circuit Specialists
I think this should be ok for putting 2 PS and 2 amps in there.
I think this should be ok for putting 2 PS and 2 amps in there.
Might as well bump up to the free shipping on the 4U case and be 100% confident everything will fit.
Unfortunately, the space doesn't allow more than 5.9" in height. That was an oversight on my part when i made the fixed shelf. It's now just too much work to unscrew 8 brackets and screw them back. I can think I can live with 3U height.
Thanks for the enclosure pointers. I am still debating should I put all 4 of them in one box or make two monoblocks - by pair both PS together and both Amps together or 2 combo of PS+AMP.