Mail Archive Search: <+from:craxd@engineer.com>

Results:

References: [ +from:craxd@engineer.com: 79 ]

Total 79 documents matching your query.

21. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Sat, 25 Jun 2005 15:43:17 -0500; Harry, That much of a voltage drop is ok (3.4 kV to 3 kV), but what were mentioning is the chart on their website which shows it having a 1000 Vdc swing from 0 to 1 ampere. From the knee, it's kind o; /archives//html/Amps/2005-06/msg00237.html (14,376 bytes)
22. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Sun, 26 Jun 2005 15:13:52 -0500; Rich, I would think it would be easy as some of the large commercial switch mode supplies work with feedback regulation. It would be just a form of a voltage regulation circuit like used on everythin; /archives//html/Amps/2005-06/msg00249.html (17,717 bytes)
23. Re: [Amps] 600 Watt Solid State Amp Project (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Sun, 26 Jun 2005 15:20:57 -0500; The best info I've seen is the "Motorola RF Device Data" books back in the 80's or so. The only other was a small paperback book published by Sams named "Practical RF Communications Data", by Doug De; /archives//html/Amps/2005-06/msg00250.html (8,821 bytes)
24. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Mon, 27 Jun 2005 01:48:46 -0500; Ian, Yes I understand that point too but here's what I'm trying to think about. In SSB where if there's no modulation, there's hardly any power being consumed so the plate voltage would raise a good; /archives//html/Amps/2005-06/msg00255.html (11,214 bytes)
25. [Amps] Magnetic Circuits and Transformers (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Mon, 27 Jun 2005 01:55:59 -0500; I ran across this book on eBay named "Magnetic Circuits and Transformers" by M.I.T. (Massachusetts Institute of Technology http://web.mit.edu/ ) written back in 1947. I have two copies of this and fi; /archives//html/Amps/2005-06/msg00256.html (7,010 bytes)
26. [Amps] Shielding (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Mon, 27 Jun 2005 20:01:25 -0500; I have a question to see what type of shielding this is I see in a Simpson 713 frequency counter. The counter is in a plastic case and does not use the copper foil shielding. It has what looks to be; /archives//html/Amps/2005-06/msg00265.html (7,129 bytes)
27. Re: [Amps] 3 PHASE TO 1 PHASE REWIND (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Wed, 29 Jun 2005 15:33:12 -0500; Doug, You can wind it that way but the losses shoot up pretty good. The primary would have to be put on the center leg. You may want to just wind one big coil and mount it on the center leg (core) as; /archives//html/Amps/2005-06/msg00288.html (8,717 bytes)
28. [Amps] Simpson Electric (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Wed, 29 Jun 2005 15:41:04 -0500; I wanted to write this to tell just how helpful Simpson Electric has been over a discontinued frequency counter. I e-mailed them about the model 713 counter about a week ago. I asked if it were possi; /archives//html/Amps/2005-06/msg00289.html (6,796 bytes)
29. Re: [Amps] RE : 3 PHASE TO 1 PHASE REWIND (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Fri, 01 Jul 2005 00:28:41 -0500; Jos, You probably could by using the center leg primary only for the input and all the other windings as secondaries. The losses would be higher though in the two outside legs as compared to one woun; /archives//html/Amps/2005-07/msg00000.html (10,289 bytes)
30. [Amps] AN/PRM-10 Dip Meter (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Fri, 01 Jul 2005 00:33:04 -0500; All, I just ran across a military AN/PRM-10 Grid Dip Meter on eBay in good shape. They're built like a tank and this one was calibrated in 2000. I would have bid if I had the cash this month. I think; /archives//html/Amps/2005-07/msg00001.html (6,749 bytes)
31. [Amps] Signal Generators (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Sat, 02 Jul 2005 02:03:34 -0500; All, I was looking for some input on two signal generators I was looking at. One is a HP 8640 and the other is a Wavetek 3000 and or 3001. I know the 3000 and 3001 does not have a built in frequency; /archives//html/Amps/2005-07/msg00002.html (6,858 bytes)
32. Re: [Amps] Heath SB1000 problem (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Sun, 03 Jul 2005 04:10:05 -0500; Roger, Generally the layer insulation in between the HV and LV coils are pretty thick, about X2 to X3 as thick as in layers of each coil. So, a coil to coil short is kind of rare. The best way to che; /archives//html/Amps/2005-07/msg00016.html (12,063 bytes)
33. [Amps] SB-1000 schematic problem (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Mon, 04 Jul 2005 08:23:54 -0500; I was looking at the original Heath schematic for a SB-1000 and seen it gave only 700 Vac for the HV ac on the transformer for plate voltage. This cant be right and has to be a mis-print I would thin; /archives//html/Amps/2005-07/msg00019.html (7,114 bytes)
34. Re: [Amps] Signal Generators (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Tue, 05 Jul 2005 22:15:44 -0500; Peter, The 8640B is the one I more of less am going to get and the reason being the frequency is on a spinner knob, no dial switches or keypads. Keypads are notorious to wear out and so are the dial; /archives//html/Amps/2005-07/msg00027.html (15,010 bytes)
35. Re: [Amps] Transformer spec's for linear amplifier (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Thu, 07 Jul 2005 00:36:03 -0500; Guillermo, If your using a full wave doubler, then the current from the transformer can be found by multiplying the current by 2 and then use the full wave formula for transformers. You all ready kno; /archives//html/Amps/2005-07/msg00044.html (8,580 bytes)
36. Re: [Amps] Transformer spec's for linear amplifier-Correction (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Thu, 07 Jul 2005 00:55:56 -0500; -- Original Message -- From: "Will Matney" <craxd@engineer.com> To: amps@contesting.com Subject: Re: [Amps] Transformer spec's for linear amplifier Date: Thu, 07 Jul 2005 00:36:03 -0500 Correction, I; /archives//html/Amps/2005-07/msg00045.html (9,388 bytes)
37. Re: [Amps] Transformer spec's for linear amplifier - added (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Thu, 07 Jul 2005 11:46:52 -0500; Guillermo, Rich is correct. The transformer can be de-rated some in most amateur applications. The ratings are known as ICAS (Intermittent Commercial and Amateur Service), and CCS (Continuous Commerc; /archives//html/Amps/2005-07/msg00050.html (11,382 bytes)
38. Re: [Amps] Determining Filament Voltage Specifications ?? (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Thu, 07 Jul 2005 18:38:29 -0500; Ron, There is a formula to estimate regulation but it's long and drug out, or what I'd call the long formula. An estimate is a voltage drop of 11% to 14%. I always use 12% myself and it generally com; /archives//html/Amps/2005-07/msg00054.html (9,098 bytes)
39. Re: [Amps] filament transformer (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Fri, 08 Jul 2005 00:12:49 -0500; -- Original Message -- From: "John Irwin" <crazytvjohn@yahoo.com> I assume you mean the current drawn by the primary? If so it is simple ohms law. In a transformer, wattage in equals wattage out plus; /archives//html/Amps/2005-07/msg00058.html (7,825 bytes)
40. Re: [Amps] filament transformer (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Fri, 08 Jul 2005 16:20:14 -0500; John, David is right on this and I forgot to mention the variac. One thing though, it seems I remember something about those variacs having a set duty cycle that might be on a tag on them, I cant rem; /archives//html/Amps/2005-07/msg00065.html (10,888 bytes)

Current List: 21 - 40
Page: [1] [2] [3] [4]