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1. [Amps] Ldmos heat spreaders (score: 1): Author: Ian Swain <insane.swain@gmail.com>; Date: Sat, 13 Aug 2016 07:52:59 +1200; Hi guys I'm building my first ldmos amp with a blf188xr and can't find a nice think slab of copper for a heat spreader I've only found up to 6mm think would this be okay ? Or could I get away with 2; /archives//html/Amps/2016-08/msg00010.html (6,770 bytes)
2. Re: [Amps] Ldmos heat spreaders (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Mon, 15 Aug 2016 08:06:25 -0600; Hi Ian, http://www.communication-concepts.com/heat-sinks/ 73, Tom W0IVJ I've only found up to 6mm think would this be okay ? Or could I get away with 2 layers to get 12 mm with heat transfer paste ?; /archives//html/Amps/2016-08/msg00017.html (7,655 bytes)
3. Re: [Amps] Ldmos heat spreaders (score: 1): Author: Clark Turner <Clark@ClarkTurnerTuning.com>; Date: Mon, 15 Aug 2016 11:48:41 -0700; I purchased my Spreader on ebay. Half inch thick, 15 X 7 slab of copper for two 188s C http://www.communication-concepts.com/heat-sinks/ 73, Tom W0IVJ I've only found up to 6mm think would this be ok; /archives//html/Amps/2016-08/msg00027.html (8,823 bytes)
4. Re: [Amps] Ldmos heat spreaders (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Tue, 16 Aug 2016 07:57:10 +1200; I've only found up to 6mm think would this be okay ? Or could I get away with 2 layers to get 12 mm with heat transfer paste ? I've bought 12mm copper bar from Steeltech on Te Tahi street. Heat trans; /archives//html/Amps/2016-08/msg00030.html (8,465 bytes)
5. Re: [Amps] Ldmos heat spreaders (score: 1): Author: Kevin <kstover@ac0h.net>; Date: Mon, 15 Aug 2016 18:20:49 -0500; w6plq.com Look in the "Parts I can supply" link on his page. Milled and drilled for the device and the heat sink. He will flow solder, (recommended install method by Freescale and NXP) the device to; /archives//html/Amps/2016-08/msg00032.html (8,461 bytes)
6. Re: [Amps] Ldmos heat spreaders (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 19 Aug 2016 15:51:38 +0000; Ian, Steve, and all, I've only found up to 6mm think would this be okay ? It's less than optimal, but better than having no spreader. Here is a useful online calculator for heat spreaders: http://www; /archives//html/Amps/2016-08/msg00042.html (13,133 bytes)
7. Re: [Amps] Ldmos heat spreaders (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Mon, 22 Aug 2016 07:44:16 +0100; I do agree on the interfaces being extremely important, and the most important one is that between the FET and the spreader. Soldering the FET to the spreader is essential when the application has h; /archives//html/Amps/2016-08/msg00068.html (8,864 bytes)
8. [Amps] LDMOS HEAT SPREADERS (score: 1): Author: John Lyles <jtml@losalamos.com>; Date: Fri, 26 Aug 2016 01:44:52 -0600; I wonder if a high power transistor could mount on a chill block sold for puck type very high power devices. For instance, http://catalog.chtechnology.com/viewitems/extruded-bonded-fin-heat-sinks/liq; /archives//html/Amps/2016-08/msg00070.html (8,877 bytes)
9. Re: [Amps] LDMOS HEAT SPREADERS (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 28 Aug 2016 18:02:34 +0000; John, I wonder if a high power transistor could mount on a chill block sold for puck type very high power devices. For instance, http://catalog.chtechnology.com/viewitems/extruded-bonded-fin-heat-sin; /archives//html/Amps/2016-08/msg00074.html (12,259 bytes)
10. Re: [Amps] LDMOS HEAT SPREADERS (score: 1): Author: Steve <g8gsq72@gmail.com>; Date: Tue, 30 Aug 2016 15:53:41 +0100; Can't see why not with a bit of effort and ingenuity, and looks well worth the effort. The same people list 'liquid chill plates' under the 'heat sinks' category. These look remarkably similar to one; /archives//html/Amps/2016-08/msg00076.html (8,786 bytes)
11. Re: [Amps] LDMOS HEAT SPREADERS (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Wed, 31 Aug 2016 04:19:03 -0400; There should be hundreds of those heat transfer blocks (solid Copper) available at computer repair shops. Every time they install a new CPU that came with a cooler, be it water or vapor phase, there; /archives//html/Amps/2016-08/msg00077.html (13,717 bytes)
12. Re: [Amps] LDMOS HEAT SPREADERS (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 31 Aug 2016 14:49:56 +0000; Alex, I don't know about that, but you have liquid cooled heatsinks for high power processors capable of taking care of a few hundreds of watts. In the PC overclocking scene, a lot of snake oil is be; /archives//html/Amps/2016-08/msg00079.html (13,466 bytes)
13. Re: [Amps] LDMOS HEAT SPREADERS (score: 1): Author: Ken K6MR <k6mr@outlook.com>; Date: Wed, 31 Aug 2016 11:09:31 -0700; With some care and ingenuity, a thick copper or aluminium plate placed on the kitchen range or a camping stove will do fine. W6PQL has a video on his site that shows how he does it. Hot plate and lar; /archives//html/Amps/2016-08/msg00081.html (7,996 bytes)
14. Re: [Amps] LDMOS HEAT SPREADERS (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Wed, 31 Aug 2016 13:36:17 -0400; I'm running 8 core CPUs OCd to 5 GHz. They require water cooling. The only time the dump a lot pf heat, is either gaming, or serious number crunching. Few processors run anywhere near their max ratin; /archives//html/Amps/2016-08/msg00082.html (15,118 bytes)
15. Re: [Amps] LDMOS HEAT SPREADERS (score: 1): Author: Steve Thompson <g8gsq72@gmail.com>; Date: Wed, 31 Aug 2016 22:33:05 +0100; I guess the factory probably has a supply of chilled water at pressure to make life easier. If I've got my sums right, with perfect heat transfer, around 240ml/min should be sufficient. OK, in realit; /archives//html/Amps/2016-09/msg00000.html (8,601 bytes)
16. Re: [Amps] LDMOS HEAT SPREADERS (score: 1): Author: Kevin <kstover@ac0h.net>; Date: Wed, 31 Aug 2016 18:36:50 -0500; In the PC overclocking scene, a lot of snake oil is being sold. Not necessarily. My quad core AMD running at 3.5GHz per core, full tilt, will dissipate 135W. The Zallman cooler I have on mine will ke; /archives//html/Amps/2016-09/msg00003.html (9,094 bytes)

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