Lm1875

soundNERD · 5th October 2003, 01:25 PM

I don't know too much about heatsinks, other than they take heat off of chips. Is the small heatsink below sufficient for the LM1875?

jean-paul · 5th October 2003, 01:31 PM

No, far from that. Use a proper heatsink that is able to keep the chip at a normal temperature at full load.

soundNERD · 5th October 2003, 01:37 PM

How about this?

jean-paul · 5th October 2003, 03:18 PM

Still too small.

Netlist · 5th October 2003, 03:31 PM

Quote:

Originally posted by soundNERD
I don't know too much about heatsinks

Here's the datasheet for the LM1875.
http://www.national.com/ds/LM/LM1875.pdf
There's a lot of good info in it regarding heatsinks.
Search this forum as well. There are many threads talking about calculating them.
This is one example: http://www.diyaudio.com/forums/showt...ht=#post101358

/Hugo

soundNERD · 6th October 2003, 02:27 AM

I have the datasheet, but all the equations and info about heatsinks make no sense to me. Can anybody explain to me some basic things about them?

My project is a surround sound computer speaker system.

Thanks, Mike

autoexec · 7th October 2003, 05:44 AM

just get 1 about the size of a couple of decks of playing cards

JCoffey · 7th October 2003, 12:39 PM

Or a heatsink from a PentiumII processor. My LM7886 integrated once I took it apart has a heatsink that size that both chips are attached to. I was kinda shocked, but it's never gotten too hot, so the LM1875's shouldnt need any more than that. I have access to quite a few of them here at work, since we're pulling all of our old PII pcs.

jean-paul · 7th October 2003, 02:55 PM

Quote:

Originally posted by autoexec
just get 1 about the size of a couple of decks of playing cards

That's better.

soundNERD · 8th October 2003, 01:21 AM

so, this is a little overkill, right? i mean, it can keep a 3886 cool... or am i wrong. If you cant read the ruler, it is 4 and 1/8 inch wide, about 2.5 inches deep and a little over 3/4 inch tall.

5th October 2003, 01:31 PM	#2
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: Germany	No, far from that. Use a proper heatsink that is able to keep the chip at a normal temperature at full load. __________________ It's only audio

5th October 2003, 03:18 PM	#4
jean-paul diyAudio Moderator Emeritus Join Date: Sep 2002 Location: Germany	Still too small. __________________ It's only audio

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6th October 2003, 02:27 AM	#6
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	I have the datasheet, but all the equations and info about heatsinks make no sense to me. Can anybody explain to me some basic things about them? My project is a surround sound computer speaker system. Thanks, Mike

7th October 2003, 05:44 AM	#7
autoexec diyAudio Member Join Date: Oct 2003 Location: Maroubra, Sydney, Australia	just get 1 about the size of a couple of decks of playing cards

7th October 2003, 12:39 PM	#8
JCoffey diyAudio Member Join Date: May 2003 Location: Atlanta, GA	Or a heatsink from a PentiumII processor. My LM7886 integrated once I took it apart has a heatsink that size that both chips are attached to. I was kinda shocked, but it's never gotten too hot, so the LM1875's shouldnt need any more than that. I have access to quite a few of them here at work, since we're pulling all of our old PII pcs.

8th October 2003, 01:21 AM	#10
soundNERD diyAudio Member Join Date: Sep 2003 Location: Illinois	so, this is a little overkill, right? i mean, it can keep a 3886 cool... or am i wrong. If you cant read the ruler, it is 4 and 1/8 inch wide, about 2.5 inches deep and a little over 3/4 inch tall.