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21. [Amps] For Rex Lint (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 16 Feb 2010 01:59:16 +0000; Rex, Got your direct message. I tried again, this time sending only a short message, without the attachment. It bounced back just the same. It's NOT a problem of a wrong address. It must be something; /archives//html/Amps/2010-02/msg00422.html (7,557 bytes)
22. [Amps] Transformer winding (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 22 Feb 2010 22:52:58 +0000; Hello all, since so many list members have asked for my transformer design spreadsheet, and I keep getting request for it, I thought there is enough interest to invest a bit more work in this. So I h; /archives//html/Amps/2010-02/msg00664.html (6,963 bytes)
23. Re: [Amps] Utilization of old TV transformer (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 20 Mar 2010 00:01:11 +0000; Vic, Yes - but the secondary isn't! Actually it's quite a bit over the edge! You are forgetting that doubling the current QUADRUPLES the power loss in the windings! That's OK only if you reduce the d; /archives//html/Amps/2010-03/msg00388.html (8,911 bytes)
24. Re: [Amps] New solid state kid on the block (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 03 Feb 2011 00:14:09 +0000; Hi Bill, Baruch, Alex, and all, Thanks for all the info. I was hinted about this new transistor a few days ago, and tried to make up my mind whether to try it. And now I'm still trying to make up my; /archives//html/Amps/2011-02/msg00015.html (11,279 bytes)
25. [Amps] Using small switching MOSFETs (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 06 Feb 2011 17:40:40 +0000; Hi all, regarding the DL9AH design based on many small cheap switching MOSFETs in parallel, I have a question that maybe someone can answer. Older MOSFETs, like the IRF710 he used, typically have cap; /archives//html/Amps/2011-02/msg00040.html (8,488 bytes)
26. Re: [Amps] Shipping to Japan (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 20 Jun 2011 17:30:38 +0000; Hello, I would like to add some information to this, from the point of view of someone who lives outside the USA. The USA is a pretty special case, it seems, regarding shipping of goods. In most coun; /archives//html/Amps/2011-06/msg00267.html (12,221 bytes)
27. Re: [Amps] Risks from continuous discharge of high voltage ?? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 03 Jul 2011 22:19:32 +0000; David, That's right. I think that nowadays there are far too many notes around telling people not to do this, not to do that, not to do something at home, and so on. I mean, if somebody buys that tra; /archives//html/Amps/2011-07/msg00021.html (10,063 bytes)
28. [Amps] MOSFET ratings (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 17 Jul 2011 18:36:51 +0000; Hi all, Over the last days I have been experimenting with low cost switching MOSFETs pressed into RF power amp service. The results are quite encouraging, such as 100 watts of pretty clean output (an; /archives//html/Amps/2011-07/msg00205.html (8,185 bytes)
29. Re: [Amps] MOSFET ratings (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 18 Jul 2011 16:58:51 +0000; Steve, Yes, that's right. But a MOSFET's internal diode is impossible to separate from the MOSFET. So if the diode is limited to 5 V/ns slew rate or so, then I can't see how the entire MOSFET could h; /archives//html/Amps/2011-07/msg00216.html (10,620 bytes)
30. Re: [Amps] MOSFET ratings (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 19 Jul 2011 22:04:27 +0000; Steve, No problem! We are among hams here. Yes, that make sense. I found an application note that says basically the same. It's AN2626 from STMicroelectronics, available on st.com. So I think that I; /archives//html/Amps/2011-07/msg00222.html (9,679 bytes)
31. Re: [Amps] New NXP BLF578XR 1200W LDMOS FET is "indestructible" (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 22 Jul 2011 16:56:05 +0000; Well, I know a guy who is surely able to destroy even that transistor! ;-) A transistor like this one, packing so much power into a single (and rather small) package, is extremely hard to cool adequ; /archives//html/Amps/2011-07/msg00262.html (10,903 bytes)
32. Re: [Amps] New NXP BLF578XR 1200W LDMOS FET is "indestructible" (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 23 Jul 2011 15:56:48 +0000; Paul, That's only half of the picture. The other half is that it needs to be kept very much cooler than a tube! In some cases, comparing the more compact tubes with the larger transistors, that could; /archives//html/Amps/2011-07/msg00280.html (13,823 bytes)
33. Re: [Amps] Plate Cap Quandary (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 06 Aug 2011 02:12:00 +0000; Hi Carl, Marv, I was about to suggest to simply reverse the order of things, and do this: 1) add up the tube's capacitance, stray capacitance, and minimum capacitance of the plate tuning cap; 2) Calc; /archives//html/Amps/2011-08/msg00010.html (8,061 bytes)
34. Re: [Amps] Any new tube research? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 15 Aug 2011 20:02:28 +0000; Let me chime in on this thread: As semiconductors have improved over the last half century, they have progressively replaced, displaced, and ruled out tubes that formerly were used instead of them. K; /archives//html/Amps/2011-08/msg00068.html (9,027 bytes)
35. [Amps] Water cooling (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 21 Aug 2011 01:47:21 +0000; Dan, for my new low cost solid state amp, which is slowly gaining shape in the design software and via real world tests of subcircuits, I was considering two heat sinks forming a duct, through which; /archives//html/Amps/2011-08/msg00113.html (8,388 bytes)
36. Re: [Amps] Any new tube research? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 22 Aug 2011 01:00:14 +0000; Roger, If you want that thermal mass as a safety measure against failure of the cooling circuit, why not use water for the thermal mass too? After all water has a specific heat per weight that is mor; /archives//html/Amps/2011-08/msg00132.html (9,759 bytes)
37. Re: [Amps] Liquid cooling (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 23 Aug 2011 20:24:38 +0000; Roger, I see that Bill posted some of our private interchange here! No problem with me. But now I feel that I have to reply to your comments! But Arctic Silver conducts heat about ten times worse tha; /archives//html/Amps/2011-08/msg00156.html (10,092 bytes)
38. Re: [Amps] Liquid cooling (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 24 Aug 2011 19:18:34 +0000; Roger, That's good. I would like to buy some Arctic Silver, but need to find a store that will sell me a small amount, and export it! Here in Chile, of course, that stuff is unobtainable from the loc; /archives//html/Amps/2011-08/msg00165.html (16,534 bytes)
39. Re: [Amps] Liquid cooling (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 24 Aug 2011 23:58:14 +0000; Gerald, Carl, Yes, there are some. I just checked those that have websites, such as bip.cl. They all seem to sell the same stuff... The best thermal grease they have is Thermaltake TG-1 Extreme, whic; /archives//html/Amps/2011-08/msg00168.html (8,290 bytes)
40. Re: [Amps] Liquid cooling (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 26 Aug 2011 16:02:24 +0000; Roger, No. I'm 750km away from Santiago. But I have relatives in Santiago, so if necessary I can ask them to get me something from there. The problem is that none of them have the faintest idea about; /archives//html/Amps/2011-08/msg00190.html (20,963 bytes)

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