Heat sink in BK Precision 8500 Electronic Load Teardown EEVblog #281 - Page 1
Forum section: electronics / testgear

author: set
author_rank: Newbie
timestamp: January 07, 2015, 09:21:37 pm
content: I just watched the EEVblog #281 where Dave tears down an BK electronic load. Inside the load there are two ~ 6 inch heat sinks with built in fans. I've tried searching for square tube heat sinks but haven't come up with anything. Is there a common name for that type of heat sink? And are there are good sources where I can purchase something similar?

author: Pjotr
author_rank: Frequent Contributor
timestamp: January 07, 2015, 10:05:55 pm
content: As far as I know they are simply called "Fan Cooled Heat Sinks". Do a Ebay search or simply Google

author: set
author_rank: Newbie
timestamp: January 07, 2015, 11:19:53 pm
content: Quote from: Pjotr on January 07, 2015, 10:05:55 pmI tried searching ebay and mostly came up with CPU heat sinks. Google produced similar results.

author: diyaudio
author_rank: Frequent Contributor
timestamp: January 07, 2015, 11:27:32 pm
content: Quote from: set on January 07, 2015, 09:21:37 pmCrazy, I was looking for the same thing today, looks like we cross paths. see attachment.http://www.exec-eng.com/price-list/price-list.htm#HPHS300ACGoogle Waermesimuation fischerelektronik look at the image search results, some fantastic images will show.http://www.fischerelektronik.de/aktuelles/fachbeitraege/kuehlkonzepte-fuer-die-industrieelektronik/Cataloghttp://www.fischerelektronik.de/fileadmin/fischertemplates/download/Katalog/kuehlkoerper.pdfYou not going to like the prices.

author: Pjotr
author_rank: Frequent Contributor
timestamp: January 07, 2015, 11:42:53 pm
content: Hmm yes, did also a search but not much at the moment at Ebay. You have to have luck. These heatsinks tend to be not cheap from regular vendors. Have a look here:http://www.newark.com/webapp/wcs/stores/servlet/Search?st=Fan+Cooled+Heat+Sinks&catalogId=15003&categoryId=800000006632&langId=-1&storeId=10194

author: set
author_rank: Newbie
timestamp: January 07, 2015, 11:51:27 pm
content: Quote from: diyaudio on January 07, 2015, 11:27:32 pmThe Fischer heat sinks look the closest to what I was thinking. Looking at the Exec-eng site it said that they use Wakefield-Vette for their heat sinks.http://www.wakefield-vette.com/Hopefully I there's a cheaper solution out there but I don't have my hopes up. Thanks all for the help so far.

author: diyaudio
author_rank: Frequent Contributor
timestamp: January 07, 2015, 11:55:42 pm
content: Quote from: set on January 07, 2015, 11:51:27 pmI now realise why a BK 8500 is worth $800 dollars.

author: diyaudio
author_rank: Frequent Contributor
timestamp: January 08, 2015, 12:08:13 am
content: 60 pounds for a 60 x 60 x 25 mmhttp://uk.farnell.com/fan-cooled-heat-sinks

author: set
author_rank: Newbie
timestamp: January 08, 2015, 12:14:14 am
content: These look interesting:http://www.hsmarston.co.uk/force-cooled-2.html

author: digsys
author_rank: Unknown
timestamp: January 08, 2015, 01:52:49 am
content: You have 2 other much cheaper / flexible options - referwww.pbase.com/digsys/eevblog1/www.pbase.com/digsys/image/158741421/mediumPix 01 and 02There are at least 2 sizes available. You buy the HSinks in singles and they are lock together. They're made to suit standard fan sizes.In OZ, I get them from Altronics, but others stock them also. Quite cheap.2/www.pbase.com/digsys/image/158741425/mediumPix 03 - 06Make you own !! as I do now. Grab your favourite HSink section and whip up some end plates ! Any section, any length, ANY Fan.I've pushed this design to 1500W per module !! using 2x hi-flow fans IN and OUT, each side. Using TO247 devices (V-low thermal transfer) AND -Laird Technologies A15038-004 or tGlobal Technology TG6050-24-21.01-0.5 Thermal pads pushed 2500W peaks !! ( a few seconds)1 note ! A bit of turbulence in the flow (positive pressure) helps removing heat from just behind the TO247s

author: coppice
author_rank: Super Contributor
timestamp: January 08, 2015, 04:19:09 am
content: Quote from: set on January 07, 2015, 11:19:53 pmA lot of low volume specialised test equipment use CPU or graphics card coolers these days. I've opened a few boxes and found standard coolers from people like Coolermaster inside. They are high volume products, so their prices tend to be reasonable for low volume users.

author: set
author_rank: Newbie
timestamp: January 08, 2015, 04:46:23 pm
content: Quote from: digsys on January 08, 2015, 01:52:49 amIt looks like your images aren't loading.

author: digsys
author_rank: Unknown
timestamp: January 08, 2015, 11:05:15 pm
content: Quote from: setEven from the root folder ??http://www.pbase.com/digsys/eevblogYou can navigate from there.Do the others work if you remove the ending ? iehttp://www.pbase.com/digsys/image/158741421http://www.pbase.com/digsys/image/158741425Odd, never had the problem before. Tks