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61. Re: [Amps] Dentron mla-2500 meters (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 16 Mar 2009 22:58:21 +0000 (UTC); ha, yes, I can see that now in the subject line, how unthoughtful of me! 73, Paul Whew! I looked at the subject and thought this was an amp mod to go on 2500 meters. I was real curious and started; /archives//html/Amps/2009-03/msg00452.html (7,686 bytes)
62. [Amps] smps HV transformer (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 20 Mar 2009 16:37:31 +0000 (UTC); Hi amp builders. If all goes well, I should have a pile of parts on my door today to wind my switch mode ps transformer. I'm differing from the original article in that instead of using solid copper; /archives//html/Amps/2009-03/msg00500.html (7,493 bytes)
63. [Amps] HV smps (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 26 Mar 2009 00:27:43 +0000 (UTC); hi amp builders, This is definitely much more of a challenge than I first thought it was going to be. http ://home.comcast.net/~kg7hf/PIC_0336. JPG http ://home.comcast.net/~kg7hf/PIC_0337. JPG The m; /archives//html/Amps/2009-03/msg00509.html (8,096 bytes)
64. Re: [Amps] HV smps (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 26 Mar 2009 02:09:07 +0000 (UTC); Hi Roger, Thanks for the reply. I honestly don't know how to figure that out, I would love to learn though! The part(s) I am using for the h-bridge are Fairchild FDH45N50F. They are rated at 5; /archives//html/Amps/2009-03/msg00511.html (7,249 bytes)
65. Re: [Amps] HV smps (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 26 Mar 2009 16:33:32 +0000 (UTC); A few brave builders have requested seeing the schematic to help me. I've uploaded the full schematic here: http://home.comcast.net/~kg7hf/FULL_amp.pdf The last page (4) is the h-bridge portion.; /archives//html/Amps/2009-03/msg00515.html (7,719 bytes)
66. [Amps] winding an HV transformer (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 30 Mar 2009 21:37:17 +0000 (UTC); I've been holding this question for a couple of days now, I'm sure it is very simple and perhaps I just need some reassurance on the answer. If you have been following some of this smps discussion, I; /archives//html/Amps/2009-03/msg00543.html (8,358 bytes)
67. Re: [Amps] winding an HV transformer (part 2) (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 30 Mar 2009 21:43:47 +0000 (UTC); BTW, I did try to simulate the result using the 3.4 v p-p signal generator. I've had some issues believing the result as it seems my signal generator actually produces -1.7 to +1.7 v pulses. T; /archives//html/Amps/2009-03/msg00544.html (8,563 bytes)
68. Re: [Amps] winding an HV transformer (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 31 Mar 2009 03:14:23 +0000 (UTC); Hi Jeff, Thanks for taking the time to look into this. I think you have interpreted my design correctly. As I look at it more, I think you might be right, the h-bridge is fed 340 vdc which is swi; /archives//html/Amps/2009-03/msg00546.html (11,701 bytes)
69. [Amps] hv smps (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 1 Apr 2009 11:46:15 +0000 (UTC); Hi Jeff, Just so you know, most of that power supply schematic is lifted from Tim Hulick W9QQ, and the RF deck is lifted from Dick Stevens W1QWJ. I'm not sure it really turns out any cheaper, the cor; /archives//html/Amps/2009-04/msg00001.html (7,484 bytes)
70. Re: [Amps] winding an HV transformer (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 1 Apr 2009 12:01:45 +0000 (UTC); Hi Tomm, and amps people, Thanks, the validation is very helpful. Sometimes I think about something over and over enough and get myself lost in the forest. I also read last night that the square; /archives//html/Amps/2009-04/msg00002.html (8,559 bytes)
71. Re: [Amps] winding an HV transformer (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 1 Apr 2009 12:11:02 +0000 (UTC); OK amp builders.... Which is it! -- I'm feeling unsure of myself again. Epk = 1.4 Erms. Eav = 0.9 Erms It also seems to depict the pk - pk value, the negative peaks "flipped" up to become positi; /archives//html/Amps/2009-04/msg00003.html (8,271 bytes)
72. Re: [Amps] hv smps (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 1 Apr 2009 22:39:15 +0000 (UTC); Hi Alex, Thanks for the kind offer, I've already got that part of the supply. The original article calls out for a 5100uF/400V cap, so one would need 10 pairs to get to 5000uF, which is not too muc; /archives//html/Amps/2009-04/msg00019.html (7,653 bytes)
73. [Amps] motor run cap (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 8 May 2009 00:19:16 +0000 (UTC); Hi builders, I picked up a nice ~60 cfm ebm blower at our local hamfest. This thing needs a motor run cap, 4mfd. What does a motor run cap do, and is a cap, a cap, is a cap? Can I just pull a 4; /archives//html/Amps/2009-05/msg00035.html (6,605 bytes)
74. Re: [Amps] motor run cap (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 8 May 2009 01:38:22 +0000 (UTC); Thanks to everyone for the replies, I'll just not be cheap about it and pick up the cap tomorrow. Although I do have a sprague 4.7uF 450V non polarized cap in my junk box (K2XT did you send me those; /archives//html/Amps/2009-05/msg00037.html (8,920 bytes)
75. Re: [Amps] motor run cap (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 8 May 2009 23:00:08 +0000 (UTC); Thanks again for all the replies. I picked up a 4mfd 370V motor run cap from Grainger ($4.99) on the way home today. The blower is running beautifully and very quite. Guess I can't complain abo; /archives//html/Amps/2009-05/msg00048.html (7,443 bytes)
76. [Amps] filament transformers (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 15 May 2009 20:40:02 +0000 (UTC); Hello builders, My amp continues to grow. I'm trying to pick out a filament transformer, such and easy task. The amp is based on a 3cx800a7 which requires 13.5V +- 0.6V at 1.5A. I was thinkin; /archives//html/Amps/2009-05/msg00068.html (8,062 bytes)
77. Re: [Amps] filament transformers (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sat, 16 May 2009 19:17:33 +0000 (UTC); Hi everyone, I just wanted to thank everyone for their replies. It seems the 14 or 15 Volt version at 3A will work. Actually, what I took away from the discussion is it's not a big deal as long a; /archives//html/Amps/2009-05/msg00093.html (9,111 bytes)
78. [Amps] Source wanted for HV switch-mode power supply (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 20 May 2009 18:30:42 +0000 (UTC); Hi Mike, Yes, Tim Hulick, W9QQ went SK in late 2007, he was the owner of wattsunlimited. Over the past few months, I have been building a HV switch mode power supply based on his February 1991 QEX ar; /archives//html/Amps/2009-05/msg00135.html (8,654 bytes)
79. Re: [Amps] Source wanted for HV switch-mode power supply (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 20 May 2009 20:27:19 +0000 (UTC); Hi Tomm , Actually, it is funny you say that. I wanted to redraw the schematic into my schematic program so it could do autoroute and pcb layout. When I did, I found that my pcb layout was limited; /archives//html/Amps/2009-05/msg00138.html (8,436 bytes)
80. Re: [Amps] Source wanted for HV switch-mode power supply (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 21 May 2009 15:12:39 +0000 (UTC); The addition of a control loop would be helpful with the output filter capacitors, since it will compensate dynamically for the 120Hz ripple on the output, thus reducing the capacitance requirements; /archives//html/Amps/2009-05/msg00149.html (9,436 bytes)

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