Interesting question. Thermal pad has lower conductivity than metal, but we have a whole chunk vs just some thin fins.Why not put a thermal pad the whole size of the heatsink? Or try to squeeze in a side little fan? Though those might be noisy at high speed.
Based on what info?Though I'm pretty sure those cooling options were tried by Aiyima.
You can be absolutely sure that this is not the case.Though I'm pretty sure those cooling options were tried by Aiyima.
Can you list some of those ways to 30-300% better heat dissipation. I named three: Increasing a bit the length of the HS, finding a HS with more fins, adding a small fan on the side blowing into the heatsink.You can be absolutely sure that this is not the case.
There are easily 6-10 ways you could have achieved 30-300% better heat dissipation on the A7 for well under $1 in production.
However, this should have been done in development.
But they have chosen the cheapest and simplest option.
If you are really worried about heat and want to run at high power, IMO Fosi V3 is a better way to go, and you set the same great TI3255 chip. Nicer volume pot too - better control of lower volumes.Can you list some of those ways to 30-300% better heat dissipation. I named three: Increasing a bit the length of the HS, finding a HS with more fins, adding a small fan on the side blowing into the heatsink.
Would those work? Which others?
As I said, the best solutions would have to be planned for during development, they cannot be integrated later.Can you list some of those ways to 30-300% better heat dissipation. I named three: Increasing a bit the length of the HS, finding a HS with more fins, adding a small fan on the side blowing into the heatsink.
Would those work? Which others?
Or, just get a Fosi V3 with the 48v power brick...and live life...!As I said, the best solutions would have to be planned for during development, they cannot be integrated later.
If you don't have the skills, you can destroy the power chip and circuit board.
- Screw a 3x2cm copper or aluminum plate onto the floor. Choose thickness so that a 1-2mm thick thermal pad fits tautly but without too much pressure between the circuit board and the aluminum plate. Thermal paste to all transitions.
- When the housing is closed, more cooling fins can lead to heat build-up.
- Get a heatsink that runs the full width of the case and is at least as high as the case or higher. For this heatsink, make a full cutout in the case and drill 5-6mm holes on both sides just above the circuit board every 1-1.5cm for cooling.
In addition to these measures, a different housing would make more sense. However, from this point you should think about real DIY with another class D amplifier board with this chip, a reasonable power supply and a housing. There is now enough selection of such boards with Class D amplifiers.
Yes, I didn't pay enough attention to the Fossi V3. Perhaps I get one Fossi and keep the A07 for powering a sub, if possible with two sub drivers or a dual VC.Or, just get a Fosi V3 with the 48v power brick...and live life...!
in august 2023 we have a fosi audio TB10D tpa3225 chiped amp, it has a much larger heatsinkFrom Amir's test, on 4-Ohms loads, when passing 77W/channel chip's protection kicked in. I would say that the original heatsink (probably thermal paste too) is not up to dissipate heat so well.
Maybe it would be safer to use a 32V/5A PSU for this amplifier when driving 4-Ohms loads.
Which forums you know have modified the A07? Some drilled holes in the metal case (top, sides and bottom) to help ventilation and lower the heatsink hot temp.It was experimented to some degree already. LM4562 and a couple of the OPA ones were prefered over the shipped one, likely on subjective basis though. a DIY forum or two did a lot of modifications on this unit and others.
Just look it up on diyaudio, there are a lot of modification threads for AIYIMA A7, TPA3255/3251, one even with 5000 entries.Which forums you know have modified the A07? Some drilled holes in the metal case (top, sides and bottom) to help ventilation and lower the heatsink hot temp.
A fan grill and just make time to make the holeWhich forums you know have modified the A07? Some drilled holes in the metal case (top, sides and bottom) to help ventilation and lower the heatsink hot temp.