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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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