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101. Re: [Amps] Advice needed for SS amp (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 08 Jun 2013 21:10:37 +0000; Ron, I do not know what the breakdown Voltage or dielectric constant are, but the "cover sips" are uniform very thin square (~3/4") glass plates used to cover the specimens under a microscope, the mu; /archives//html/Amps/2013-06/msg00191.html (9,548 bytes)
102. Re: [Amps] Monitoring temperature (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 10 Jun 2013 18:51:51 +0000; Bill, I would appreciate any suggestions for monitoring temperature on a solid state power amp. In addition to the chip you used, there are many other options. There are some digital temperature sens; /archives//html/Amps/2013-06/msg00208.html (10,077 bytes)
103. Re: [Amps] Advice needed for SS amp (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 10 Jun 2013 18:59:19 +0000; Paul, I missed much of the thread on making capacitors, but what about using ceramic "chips" and copper spray? I assume that with "copper spray" you mean some sort of conductive paint containing copp; /archives//html/Amps/2013-06/msg00209.html (8,974 bytes)
104. Re: [Amps] premade HV rectifier board (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 05 Jul 2013 02:37:54 +0000; Hi Rag, Chris, and all, It'll be a lot dearer than making a board using 6A10 diodes yourself though. I agree with that. I think it's a mighty waste of money to buy such encapsulated high voltage rect; /archives//html/Amps/2013-07/msg00015.html (9,543 bytes)
105. Re: [Amps] Glass Tape (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 27 Jul 2013 17:23:05 +0000; Hi, Glass tape usually turns to dust in UV sunlight. I think Carl means that glass fiber reinforced, plastic adhesive tape. That stuff indeed turns to dust rather quickly. Dust with loosely embedded; /archives//html/Amps/2013-07/msg00083.html (9,273 bytes)
106. Re: [Amps] why a tube fails ? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 29 Aug 2013 15:30:46 +0000; Jerry, I learned the opposite when I rolled a 1000 pf ceramic vacuum cap off the bench onto my foot then the floor. Current flow went to maximum when reinstalled. There is a simple solution, applying; /archives//html/Amps/2013-08/msg00173.html (8,241 bytes)
107. Re: [Amps] Future of RF AMPS (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 11 Sep 2013 15:59:23 +0000; Dick, I'm still waiting for a decent SS Amp that runs 1.5 KW out and does not cost a fortune. Why wait? Why not build it yourself? The problem is, precisely, that everyone is waiting for other people; /archives//html/Amps/2013-09/msg00035.html (17,821 bytes)
108. Re: [Amps] Future of RF AMPS (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 11 Sep 2013 22:36:45 +0000; Geert, I would also look at other devices. For instance, NXP produces a number of devices (like the BLF578XRS) where a single device produces up to 1400 watts, up to 500 MHz. I would absolutely love; /archives//html/Amps/2013-09/msg00052.html (12,533 bytes)
109. Re: [Amps] Workshop Danger (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 13 Sep 2013 17:37:41 +0000; Like many homebrewers, I cut my panel holes with a jigsaw, and finish them with files. The advantage: Essentially any shape and size is possible. Disadvantage: It takes a bit of practice to get nice,; /archives//html/Amps/2013-09/msg00131.html (9,547 bytes)
110. Re: [Amps] Future of RF AMPS (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Fri, 13 Sep 2013 19:14:14 +0000; Jim, manages to get 800w to 1 kw out of just one device. I saw on U tube, 1 of em being used in a 1250w CCS FM broadcast TX, 88-108 mhz variety. That's in saturated service. Dissipation should be no; /archives//html/Amps/2013-09/msg00135.html (19,872 bytes)
111. Re: [Amps] Rectifier equilization? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 14 Sep 2013 01:57:02 +0000; Hardy, I have 100 1N5408's that came off the same reel so I feel they should be matched fairly close. I would like to hear a few opinions. Thanks When the original diodes blew in my National Radio NC; /archives//html/Amps/2013-09/msg00153.html (9,043 bytes)
112. Re: [Amps] Workshop Danger (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 14 Sep 2013 02:22:10 +0000; Peter, I like your point of view! What do you use grinding wheels for, when they are worn down almost to the hub? I have quite a few of them, and I hate throwing them away...! And the last two centim; /archives//html/Amps/2013-09/msg00154.html (10,417 bytes)
113. Re: [Amps] Workshop Danger (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 14 Sep 2013 02:34:25 +0000; Alek, when I was a 14 year old QRP radio builder and as poor as a church mouse, I used your method. My dad at least had a hand drill, and I borrowed the file. But now that I'm old and rich (?), I can; /archives//html/Amps/2013-09/msg00155.html (8,709 bytes)
114. Re: [Amps] Rectifier equilization? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sat, 14 Sep 2013 19:14:53 +0000; Bill, FYI for next time, 6A10 diodes have become preferred by many for high power use because of their 6 amp continuous and 400 amp surge ratings and moderate cost. I don't mean to say anything again; /archives//html/Amps/2013-09/msg00166.html (10,525 bytes)
115. Re: [Amps] Future of RF AMPS (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 16 Sep 2013 18:39:11 +0000; Dick, I have to believe that M2 knows what they are doing with these Amps. They offer a 12 month limited warranty on them. I really hope so! I know nobody who owns one of those amps and uses it inten; /archives//html/Amps/2013-09/msg00200.html (12,793 bytes)
116. Re: [Amps] Rectifier equilization? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 16 Sep 2013 19:21:10 +0000; Paul, Surely one half cycle won't fully charge the filter capacitor(s). How many half cycles would required to fully charge them? In theory, infinite half cycles! The charging current gets ever lower; /archives//html/Amps/2013-09/msg00202.html (15,370 bytes)
117. Re: [Amps] Direct rectification of AC mains to derive the amp VDD, > supply (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Mon, 16 Sep 2013 19:36:27 +0000; Leigh, I would not consider schemes that directly rectify the mains to provide the DC supply rail to a QRO MOSFET RF amplifier because it's a daft idea from the concern of safety issues relating to e; /archives//html/Amps/2013-09/msg00203.html (10,565 bytes)
118. Re: [Amps] Direct rectification of AC mains to derive the amp VDD, supply (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Tue, 17 Sep 2013 18:59:56 +0000; Leigh, I can in principle concur with your 3 salient points here Manfred. Yes, we concur on the points, and only weigh them differently. No problem with that. Given the choice, I also find an isolate; /archives//html/Amps/2013-09/msg00210.html (22,343 bytes)
119. [Amps] Re Direct rectification of AC mains to derive the amp, VDD, supply (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Wed, 18 Sep 2013 13:43:05 +0000; Peter, Much as I respect Manfred, I think he is "pushing things" a bit far - at least for "Joe Q. Ham". I can't help but keep defending my point of view! Consider the following situations: 1.- A ham; /archives//html/Amps/2013-09/msg00217.html (12,980 bytes)
120. Re: [Amps] Re Direct rectification of AC mains to derive the amp, VDD, supply (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Thu, 19 Sep 2013 15:27:07 +0000; Peter, I am afraid you are missing my point. So it seems! What you can do safely as a professional engineer is not the same as the average amateur building at home. Indeed I was referring to what can; /archives//html/Amps/2013-09/msg00234.html (10,198 bytes)

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