where do you get your heat sinks ?

percy · 9th August 2005, 09:44 PM

I am trying to find a heat sink(TO-220) for a standalone mono LM1875 amp I am going to build and just can't find one with the specs that I am looking for.
I believe I need something with a dissipation of 19-20W and a thermal resistance of atleast 3°C/W or better. I tried digikey, mouser, allied but either I could found suitable dissipation or thermal resitance, but not both. They all carry the same Aavid Thermalloy heat sinks. Where else can I try (in usa) ?

BrianDonegan · 10th August 2005, 02:56 AM

EBay is a good place to look. Search on Heat Sink (two words). "Business and Industrial" and "Consumer Electronics" are good catagories to then look in.

I have used this guy:
http://search.ebay.com/_W0QQsassZbarrredboss

Very good. I ordered a couple 24" sections and had him cut (for free) into 4" pieces for a parts group buy. Very nice. Small enough for Chip or small trasistor applications, and a good size to double up for larger amps. I believe everyone was happy with the sinks, which have 2 LM3886s mounted on a 4" piece.

jleaman · 10th August 2005, 03:14 AM

Quote:

Originally posted by BrianDonegan
EBay is a good place to look. Search on Heat Sink (two words). "Business and Industrial" and "Consumer Electronics" are good catagories to then look in.

I have used this guy:
http://search.ebay.com/_W0QQsassZbarrredboss

Very good. I ordered a couple 24" sections and had him cut (for free) into 4" pieces for a parts group buy. Very nice. Small enough for Chip or small trasistor applications, and a good size to double up for larger amps. I believe everyone was happy with the sinks, which have 2 LM3886s mounted on a 4" piece.

Brian that guy yuo just posted a link to on ebay. HE IS SUPER SUPER GOOD. i bought all my heat sinks from him and excellent service he suprized me with black anodized ones too. : O ) Good guy has good product too.

RI_Pilot · 10th August 2005, 07:39 AM

I get mine from Ebay.

Howard

percy · 10th August 2005, 02:50 PM

Thank you!

Sherman · 10th August 2005, 03:51 PM

I've gotten excellent deals at American Science and Surplus. There is a retail outlet near me and I can usually pick up heat sinks sufficient for 387x and 478x chips for under $2.

They have a website- www.sciplus.com and may have some online. Of course since they are either surplus or overstocks or removed from equipment you never know what you might find (but that's half the fun).

sam9 · 10th August 2005, 04:09 PM

Me, too. Ebay.

It looks like you were tinking of a PCB mounted heatsink. I'm not sure that works well except at very low powers like 20W or less. I tried that once and found a source for 3 inch high finned Avid-Thermolloy PBC mounted types fot TO-247. They were barely acceptable thermally and were so big that they could flex the PCB enough to crack solder joints. A "good" idea that wasn't.

Anyway if money is no object there are two other sources

www.mmmetals.com, and
www.conradheatsinks.com

The products are good but it may be expensive for what you are doing.

One more idea if you are a scrounger. This worked OK for me. Sometimes you can find used/surplus heatsinks for CPUs. Look for ones with the longest forest of posts you can find -- lots of surface area. Individually they are too small, but if you get several and bolt them very tightly (with thermal grease in between) to a piece of aluminum plate you can make a fair heatsink for almost nothing. When I do this the results are ugly but it works.

segasonicfan · 14th August 2005, 06:56 AM

I usually borrow mine from scrap electronics. A good source is old PC heatsinks...There's always friends and people out there that are throwing away PCs or something else, so I always take it off their hands and use the heatsinks (among other things) from them. Making a TO-220 heatsink is pretty easy to make out of any heatsink too...I use a dremel to drill a hole through it and then put a screw and nut to hold the chip in place.

-Segasonicfan

percy · 14th August 2005, 01:32 PM

I have a few cpu heat sinks lying around and I did think in that direction but the trouble is I have no clue what thermal resistance they are. You can get an idea of its dissipation rating from the type of cpu its being used on, but what about the thermal resistance ?

snip6600 · 15th August 2005, 12:50 PM

Anyone know of any sources in the United Kingdom for good heatsinks?

// J

9th August 2005, 09:44 PM	#1
percy diyAudio Member Join Date: Apr 2004 Location: MN	where do you get your heat sinks ? I am trying to find a heat sink(TO-220) for a standalone mono LM1875 amp I am going to build and just can't find one with the specs that I am looking for. I believe I need something with a dissipation of 19-20W and a thermal resistance of atleast 3°C/W or better. I tried digikey, mouser, allied but either I could found suitable dissipation or thermal resitance, but not both. They all carry the same Aavid Thermalloy heat sinks. Where else can I try (in usa) ?

10th August 2005, 02:56 AM	#2
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	EBay is a good place to look. Search on Heat Sink (two words). "Business and Industrial" and "Consumer Electronics" are good catagories to then look in. I have used this guy: http://search.ebay.com/_W0QQsassZbarrredboss Very good. I ordered a couple 24" sections and had him cut (for free) into 4" pieces for a parts group buy. Very nice. Small enough for Chip or small trasistor applications, and a good size to double up for larger amps. I believe everyone was happy with the sinks, which have 2 LM3886s mounted on a 4" piece. __________________ Twisted Pear Audio

10th August 2005, 03:51 PM	#6
Sherman diyAudio Member Join Date: Feb 2004 Location: Chicago area	I've gotten excellent deals at American Science and Surplus. There is a retail outlet near me and I can usually pick up heat sinks sufficient for 387x and 478x chips for under $2. They have a website- www.sciplus.com and may have some online. Of course since they are either surplus or overstocks or removed from equipment you never know what you might find (but that's half the fun). __________________ --Sherman

15th August 2005, 12:50 PM	#10
snip6600 diyAudio Member Join Date: Aug 2005	Heatsinks in the UK Anyone know of any sources in the United Kingdom for good heatsinks? // J

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

10th August 2005, 07:39 AM	#4
RI_Pilot diyAudio Member Join Date: Mar 2005 Location: Rhode Island	I get mine from Ebay. Howard

10th August 2005, 02:50 PM	#5
percy diyAudio Member Join Date: Apr 2004 Location: MN	Thank you!

10th August 2005, 04:09 PM	#7
sam9 diyAudio Member Join Date: Jun 2002 Location: Left Coast	Me, too. Ebay. It looks like you were tinking of a PCB mounted heatsink. I'm not sure that works well except at very low powers like 20W or less. I tried that once and found a source for 3 inch high finned Avid-Thermolloy PBC mounted types fot TO-247. They were barely acceptable thermally and were so big that they could flex the PCB enough to crack solder joints. A "good" idea that wasn't. Anyway if money is no object there are two other sources www.mmmetals.com, and www.conradheatsinks.com The products are good but it may be expensive for what you are doing. One more idea if you are a scrounger. This worked OK for me. Sometimes you can find used/surplus heatsinks for CPUs. Look for ones with the longest forest of posts you can find -- lots of surface area. Individually they are too small, but if you get several and bolt them very tightly (with thermal grease in between) to a piece of aluminum plate you can make a fair heatsink for almost nothing. When I do this the results are ugly but it works.

14th August 2005, 06:56 AM	#8
segasonicfan diyAudio Member Join Date: Aug 2005	I usually borrow mine from scrap electronics. A good source is old PC heatsinks...There's always friends and people out there that are throwing away PCs or something else, so I always take it off their hands and use the heatsinks (among other things) from them. Making a TO-220 heatsink is pretty easy to make out of any heatsink too...I use a dremel to drill a hole through it and then put a screw and nut to hold the chip in place. -Segasonicfan

14th August 2005, 01:32 PM	#9
percy diyAudio Member Join Date: Apr 2004 Location: MN	I have a few cpu heat sinks lying around and I did think in that direction but the trouble is I have no clue what thermal resistance they are. You can get an idea of its dissipation rating from the type of cpu its being used on, but what about the thermal resistance ?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
FS: Heat sinks	gengis	Swap Meet	8	17th March 2006 01:27 AM
Heat Sinks	serengetiplains	Parts	3	3rd January 2006 06:41 AM
heat sinks	D3	Pass Labs	9	29th December 2003 07:19 AM
Heat sinks - going the other way	jackinnj	Everything Else	9	27th April 2003 05:01 PM
Big Heat Sinks	dshortt9	Parts	15	4th November 2002 07:36 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read