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Old 7th November 2008, 04:12 PM   #1
SxiCj08 is offline SxiCj08  United Kingdom
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Smile Amp Cooling

Hi There My Fellow Forum Users Just a Quick Question My Amp Gets Rather Hot When Playing For Some Time I Was Just Wondering Can I Install Pc Fans To Keep The Temp Down If So How Would I go About Installing Them And What Size Fan Should I Get Cheers Click the image to open in full size.
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Old 7th November 2008, 04:22 PM   #2
albin is offline albin  United Kingdom
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Default hot amp

hi there
Fans are noisy,why not make a chimney for it.
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Old 7th November 2008, 04:28 PM   #3
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Get greenlee 3/4 inch hole punch set or ramp up to at least
2 rows of 1/2 inch holes underneath heatsink (6-8 3/4 " or
2 rows of 10 - 1/2") above and below heatsink.
Convection should keep it cool.

What amp is that?? ..,2- lm3886's?
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Old 7th November 2008, 05:29 PM   #4
AndrewT is offline AndrewT  Scotland
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cut a big slot to match the plan area of the heatsink in the floor of the chassis and a matching one in the top plate.
The sink will block of the bottom slot, add a mesh to the top slot to prevent fingers items getting in.
regards Andrew T.
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Old 7th November 2008, 05:41 PM   #5
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Can you draw equations of your thermal system?
It is a differential equation with many variables (I humbly suppose), if to draw one in some tolerances in mind.
The aim is to keep Vbe of output transistors stable, right?
How do you measure it? How do you compensate it? This is the question. Any real thermo-feedback system have delays. And in order to work it needs some gain. So, the task is very usual, but time constants are different, and methods to calculate them differs.

Good luck!

Edit: The task is impossible. You will aways get bad results.
I've been there, done that. Giving up too complex mathematic modeling I used an infrared camera, and decided that it is better to heat controllably devices instead of regulating them. But after building a prototype I decided to give up the entire idea of complementary emitter followers. It is a dead idea, though it is very popular.

Edit again: there are empirical formulas exist. You may keep temperature of the whole heatsink roundly using such formulas. The result will be average. But what you need actually, shorter time delays. One mostly significant delay may be reduced by a forced air, however here noise level start playing.
Also, Grasgoff & Prantle criterion is significant in such empirical engineering. Google all around it.

The Devil is not so terrible as his math model is!
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Old 7th November 2008, 06:42 PM   #6
jaycee is offline jaycee  United Kingdom
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More details needed Is this a self build ? If so where did you get that case from?

I'm assuming this uses LM3876/3886 or similar. With that size heatsink it should run quite cool. I think the main thing you need to do is create ventilation holes in the case above and below the heatsink as suggested.
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Old 7th November 2008, 10:06 PM   #7
SxiCj08 is offline SxiCj08  United Kingdom
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its a acoustic solutions sp101
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Old 7th November 2008, 10:07 PM   #8
jaycee is offline jaycee  United Kingdom
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Oh why am I not surprised. Let me guess, bought from Argos? (edit: thought of the wrong seller!!)

They already have a vent in the top. I would second AndrewT's idea - remove the main PCB + heatsink, and cut a hole in the base where the heatsink would be.

Honestly though, these things are exactly what you pay for, cheap pieces of junk, built with cheap parts in some chinese factory somewhere.
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Old 8th November 2008, 12:40 PM   #9
SxiCj08 is offline SxiCj08  United Kingdom
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I Fink It Does The Job Well.
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