LM4780 Monoblock Chasies Design

CRNIC_IVAN · 05:13 PM

Hi
I am planning to build LM4780 based Monoblock.
Now I am just preparing list of materials required for build, and making preliminary calculations.
By my calculations (using 2X22V, 400VA toroid, and using 1 chip per channel) heat sink from Conrad Heat Sinks MF25-100 with thermal resistance 0,37C/W should be sufficient.
My biggest concern is chassis layout.
My idea is to use MDF for chassis to keep cost low (I have material and tools).
Dimensions are (W/D/H) 220 / 300/ 100mm (8,6“/11,8“/4“).
My concern is will this layout allow sufficient cooling.
Front wiev

Bottom wiev, with rear plate.

Circular conpartment is for torroid, compartment near heat sink is for AMP board, and other compartment is for PS.
Thanks

CRNIC_IVAN · 30th December 2011, 05:19 PM

GloBug · 30th December 2011, 05:59 PM

I don't know about your cooling but I just wanted to say that is a neat design.

I suspect it would be OK, although it's nice to get a good of a layout as you can when passive cooling.

If you were worried, you could enlarge the "ovals", or remove material from behind the ovals exposing more fin area and allowing some cross-flow between the ovals while still having the same general appearance.

I'm just thinking out loud here so don't change it on my advice.

30th December 2011, 04:54 PM	#1
CRNIC_IVAN diyAudio Member Join Date: Mar 2007	LM4780 Monoblock Chasies Design Hi I am planning to build LM4780 based Monoblock. Now I am just preparing list of materials required for build, and making preliminary calculations. By my calculations (using 2X22V, 400VA toroid, and using 1 chip per channel) heat sink from Conrad Heat Sinks MF25-100 with thermal resistance 0,37C/W should be sufficient. My biggest concern is chassis layout. My idea is to use MDF for chassis to keep cost low (I have material and tools). Dimensions are (W/D/H) 220 / 300/ 100mm (8,6“/11,8“/4“). My concern is will this layout allow sufficient cooling. Front wiev Bottom wiev, with rear plate. Circular conpartment is for torroid, compartment near heat sink is for AMP board, and other compartment is for PS. Thanks Last edited by CRNIC_IVAN; 30th December 2011 at 05:13 PM.

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30th December 2011, 05:19 PM	#2
CRNIC_IVAN diyAudio Member Join Date: Mar 2007

30th December 2011, 05:59 PM	#3
GloBug Banned Join Date: Jun 2011	I don't know about your cooling but I just wanted to say that is a neat design. I suspect it would be OK, although it's nice to get a good of a layout as you can when passive cooling. If you were worried, you could enlarge the "ovals", or remove material from behind the ovals exposing more fin area and allowing some cross-flow between the ovals while still having the same general appearance. I'm just thinking out loud here so don't change it on my advice.

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