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1. [Amps] PS Theory ? (score: 1): Author: "Mike, K8LH" <k8lh@kramerairtool.com>; Date: Wed, 27 Aug 2003 06:23:40 -0400; Please excuse the dumb question... I'm trying to figure out how to determine the power handling capability of transformers (I did take a quick look through the ARRL Handbook last night)... Questions:; /archives//html/Amps/2003-08/msg00042.html (6,865 bytes)
2. Re: [Amps] PS Theory ? (score: 1): Author: Ron <w8ron@stratos.net>; Date: Tue, 26 Aug 2003 11:38:31 -0400; When you feed it to a doubler , the current is not .5 A but .25A. THe remainder may be due to CCS and ICAS duty. -- Ron Mike, K8LH wrote: Please excuse the dumb question... I'm trying to figure out h; /archives//html/Amps/2003-08/msg00047.html (8,229 bytes)
3. Re: [Amps] PS Theory ? (score: 1): Author: rlm <r@somis.org>; Date: Wed, 27 Aug 2003 09:01:28 -0700; ? primarily by measuring the resistance of the secondary winding. Look in "Amplifiers" on my Web site for some rule of thumb formulas. ? Duty-cycle considerations. For SSB, a 600W-CCS rated transfor; /archives//html/Amps/2003-08/msg00050.html (7,909 bytes)
4. Re: [Amps] PS Theory ? (score: 1): Author: wb8jkr@juno.com; Date: Wed, 27 Aug 2003 18:27:43 -0400; Actually in doubler service I think the transformer peak current is about four times the DC output current in a capacitor input filter. A transformer should be designed for doubler service. 73, Mark; /archives//html/Amps/2003-08/msg00054.html (9,473 bytes)
5. Re: [Amps] PS Theory ? (score: 1): Author: Bill Turner <wrt@dslextreme.com>; Date: Wed, 27 Aug 2003 15:48:22 -0700; _________________________________________________________ The power handling capability of a transformer in a steady-state condition is determined mainly by it's internal temperature. Excessive heat; /archives//html/Amps/2003-08/msg00055.html (8,564 bytes)
6. Re: [Amps] PS Theory ? (score: 1): Author: wb8jkr@juno.com; Date: Thu, 28 Aug 2003 04:45:46 -0400; Oops, I meant to say the transformer secondary current is three times (2.828) the DC output of the supply in doubler service. 73, Mark WB8JKR _________________________________________________________; /archives//html/Amps/2003-08/msg00058.html (10,237 bytes)
7. Re: [Amps] PS Theory ? (score: 1): Author: rlm <r@somis.org>; Date: Thu, 28 Aug 2003 04:01:40 -0700; ? Cashier's cheques can be forged. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2003-08/msg00059.html (9,668 bytes)
8. RE: [Amps] PS Theory ? (score: 1): Author: "Skram, Helge (MED)" <helge.skram@med.ge.com>; Date: Thu, 28 Aug 2003 15:39:55 +0200; The peak current will depend on capacitors and resistances. Peak current can be very high. What is important ia average current. PSU seems simple, but if you have specific requirements for loaded vol; /archives//html/Amps/2003-08/msg00061.html (10,983 bytes)
9. Re: [Amps] PS Theory ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Thu, 28 Aug 2003 18:50:26 +0100; Bill Turner wrote: On Wed, 27 Aug 2003 06:23:40 -0400, "Mike, K8LH" <k8lh@kramerairtool.com> wrote: How can you determine the power handling capability of a transformer??? ___________________________; /archives//html/Amps/2003-08/msg00063.html (12,042 bytes)
10. Re: [Amps] PS Theory ? (score: 1): Author: Ron <w8ron@stratos.net>; Date: Fri, 29 Aug 2003 01:32:04 -0400; Hmmm . Let's see ......the question was " How can I tell the power capability of a transformer?". I have seen in the literature or handbook where one could resistively load the transformer so that th; /archives//html/Amps/2003-08/msg00069.html (13,331 bytes)
11. Re: [Amps] PS Theory ? (score: 1): Author: rlm <r@somis.org>; Date: Thu, 28 Aug 2003 19:42:06 -0700; 9x to 10x is closer to it since the conduction period is c. 1mS per half-cycle. Amen, Mark _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti; /archives//html/Amps/2003-08/msg00070.html (10,396 bytes)
12. Re: [Amps] PS Theory ? (score: 1): Author: Steve Thompson <g8gsq@qsl.net>; Date: Fri, 29 Aug 2003 15:16:08 -0700; Peak current determines the voltage under load, it's RMS current rather than mean or 'average' that determines the heating effect in the transformer. If I remember correctly, transformer RMS current; /archives//html/Amps/2003-08/msg00075.html (8,386 bytes)
13. Re: [Amps] PS Theory ? (score: 1): Author: Bill Turner <wrt@dslextreme.com>; Date: Fri, 29 Aug 2003 19:40:39 -0700; _________________________________________________________ That's ok provided the temperature is within reason. Some transformers dissipate heat better than others even though the above test might be; /archives//html/Amps/2003-08/msg00076.html (8,479 bytes)
14. Re: [Amps] PS Theory ? (score: 1): Author: "on4kj" <on4kj@skynet.be>; Date: Fri, 29 Aug 2003 18:21:05 +0200; " KAPP's diagram " Pencil and Paper , and a good revision of the theory.... thats all you need. We are Radio Amateurs, aren't we . Have fun. Jos on4kj a transformer?". loaded voltage and current woul; /archives//html/Amps/2003-08/msg00078.html (15,108 bytes)
15. Re: [Amps] PS Theory ? (score: 1): Author: rlm <r@somis.org>; Date: Sat, 30 Aug 2003 12:12:00 -0700; ** Peak-I is typically 8 to 10 times the DC output-I in a FWB C-input config. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma; /archives//html/Amps/2003-08/msg00084.html (8,629 bytes)
16. Re: [Amps] PS Theory ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 30 Aug 2003 20:10:39 +0100; on4kj wrote: " KAPP's diagram " Pencil and Paper , and a good revision of the theory.... thats all you need. We are Radio Amateurs, aren't we . To predict power supply performance *accurately* with o; /archives//html/Amps/2003-08/msg00085.html (9,158 bytes)
17. Re: [Amps] PS Theory ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Sat, 30 Aug 2003 20:20:33 +0100; Steve Thompson wrote: On Thursday 28 August 2003 06:39, Skram, Helge (MED) wrote: The peak current will depend on capacitors and resistances. Peak current can be very high. What is important ia avera; /archives//html/Amps/2003-08/msg00086.html (10,049 bytes)
18. Re: [Amps] PS Theory ? (score: 1): Author: rlm <r@somis.org>; Date: Sun, 31 Aug 2003 07:35:18 -0700; ** Approximation formulae are given in: http://www.somis.org/D.amplifiers.2.html The math is multification and division. The needed equipment is one clip-lead and one ohm-meter. ____________________; /archives//html/Amps/2003-09/msg00001.html (7,993 bytes)
19. Re: [Amps] PS Theory ? (score: 1): Author: "Ian White, G3SEK" <G3SEK@ifwtech.co.uk>; Date: Mon, 1 Sep 2003 08:30:33 +0100; rlm wrote: ** Approximation formulae are given in: http://www.somis.org/D.amplifiers.2.html The math is multification and division. Those really aren't approximation formulae. They are handy practica; /archives//html/Amps/2003-09/msg00002.html (8,763 bytes)
20. Re: [Amps] PS Theory ? (score: 1): Author: rlm <r@somis.org>; Date: Mon, 1 Sep 2003 06:41:14 -0700; ** Ian -- Does the PSU Designer program have an entry for Mains Resistance?. How does one measure this quantity? Thanks. _______________________________________________ Amps mailing list Amps@contes; /archives//html/Amps/2003-09/msg00004.html (9,405 bytes)

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