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1. Re: [Amps] HV Supplies and Diodes (score: 1): Author: Dennis W0JX <w0jx@yahoo.com>; Date: Wed, 2 Jan 2008 10:34:27 -0800 (PST); I agree that the parallel, voltage equalizing resistors are unnecessart however, I am not so sure about the bypass capacitors (usually .01). Some believe that the capacitors are necessary to supress; /archives//html/Amps/2008-01/msg00016.html (6,831 bytes)
2. Re: [Amps] HV Supplies and Diodes (score: 1): Author: "Jim Tonne" <tonne@comcast.net>; Date: Wed, 2 Jan 2008 14:20:06 -0500; When a string of series-connected diodes is reverse-biased (during part of the cycle), the voltage drop across one is proportional to its leakage resistance. If the junction of the diode type has sig; /archives//html/Amps/2008-01/msg00017.html (7,261 bytes)
3. Re: [Amps] HV Supplies and Diodes (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Wed, 2 Jan 2008 15:28:01 -0500; Since all modern diodes have an avalanche region for reverse current protection, placing resistors across diodes in a string can only make matters worse. Without resistors, current will be the same a; /archives//html/Amps/2008-01/msg00018.html (9,605 bytes)
4. Re: [Amps] HV Supplies and Diodes (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Wed, 2 Jan 2008 17:47:15 -0500; I find it a bit strange and somewhat comical that the only ones that appear to champion resistors and capacitors across any series string of 1N540x diodes is the amateur community. Not one manufactur; /archives//html/Amps/2008-01/msg00019.html (9,527 bytes)
5. Re: [Amps] HV Supplies and Diodes (score: 1): Author: TexasRF@aol.com; Date: Wed, 2 Jan 2008 17:49:45 EST; I find it a bit strange and somewhat comical that the only ones that appear to champion resistors and capacitors across any series string of 1N540x diodes is the amateur community. Not one manufactur; /archives//html/Amps/2008-01/msg00020.html (9,428 bytes)
6. Re: [Amps] HV Supplies and Diodes (score: 1): Author: "Roger" <sub1@rogerhalstead.com>; Date: Wed, 2 Jan 2008 21:20:10 -0500; Neither. It's History and background. Most of the current crop of hams have been around long enough that's "the way things were" and unless a person keeps current they will still tend to think in th; /archives//html/Amps/2008-01/msg00022.html (10,950 bytes)
7. Re: [Amps] HV Supplies and Diodes (score: 1): Author: <d.cutter@ntlworld.com>; Date: Thu, 3 Jan 2008 12:51:32 +0000; It's the safety issues that worry me most of all. Having been through the mill of UL, CSA, CE etc when designing products for sale, I know it is a complex subject and common sense does not always lea; /archives//html/Amps/2008-01/msg00025.html (12,612 bytes)
8. Re: [Amps] HV Supplies and Diodes (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 3 Jan 2008 09:22:18 -0500; Sometimes it is good to remember the "old ways". I recall a few years ago visiting a tube audiophile who built an all tube stereo system using 866 rectifiers and 805 output tubes. They could not unde; /archives//html/Amps/2008-01/msg00027.html (14,372 bytes)
9. Re: [Amps] HV Supplies and Diodes (score: 1): Author: Larry <larry@w7iuv.com>; Date: Thu, 03 Jan 2008 11:36:05 -0800; FWIW department: Some observations noted over the last 40+ years designing, building, and testing power supplies: Determining the required ratings for power supply rectifiers, no matter if they are v; /archives//html/Amps/2008-01/msg00034.html (15,365 bytes)
10. Re: [Amps] HV Supplies and Diodes (score: 1): Author: "Harold Mandel" <hmandel@barantelecom.com>; Date: Thu, 3 Jan 2008 14:56:53 -0500; In answer to Bill Fuqua's question, experience and older copies of the Handbook provided the information to multiply the a.c. secondary voltage by a minimum of 2.82 for the diode capability. Practica; /archives//html/Amps/2008-01/msg00035.html (8,516 bytes)
11. Re: [Amps] HV Supplies and Diodes (score: 1): Author: "k7rdx" <k7rdx@charter.net>; Date: Thu, 3 Jan 2008 12:23:03 -0800; Larry`s right about the encapsulated diodes...The stacks are neat appearing and easy to mount but the leads are where most of the heat dissipates...I can prove that by looking at diodes in a working; /archives//html/Amps/2008-01/msg00037.html (16,907 bytes)
12. Re: [Amps] HV Supplies and Diodes (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Thu, 3 Jan 2008 18:05:42 -0500; The application notes for the 1N540x series that I mentioned yesterday all made mention of derating based upon lead length and mounting method. A 3X or twice the 1.414 has always been considered good; /archives//html/Amps/2008-01/msg00046.html (19,009 bytes)
13. [Amps] HV Supplies and Diodes (score: 1): Author: peter.chadwick@Zarlink.Com; Date: Thu, 3 Jan 2008 23:10:42 +0000; According to the designers I used to work with, who designed diode and thyristor and IGBT stacks for everything up to 5000 volts DC at 2500 Amps, when putting diodes in series. make sure they;re from; /archives//html/Amps/2008-01/msg00047.html (9,097 bytes)
14. Re: [Amps] HV Supplies and Diodes (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 3 Jan 2008 18:50:32 -0500; The 1980 ARRL handbook section on power supplies does recommend using resistors across each diode in a string. The 2000 ARRL handbook recommends NOT using resistors across each diode in a string. Tim; /archives//html/Amps/2008-01/msg00049.html (19,658 bytes)
15. Re: [Amps] HV Supplies and Diodes (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 3 Jan 2008 23:22:43 -0500; The reverse current will be set by the sum of the leakage resistance of ALL of the diodes in the string that are not in avalanche. The current will be the same in all the diodes, they are in series.; /archives//html/Amps/2008-01/msg00054.html (9,627 bytes)
16. Re: [Amps] HV Supplies and Diodes (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 04 Jan 2008 09:13:18 +0000; It's worth pointing out that the peak current in the transformer is the same as the peak current in the diodes. The heating effect of the current flowing in short peaks (in a cap input supply) is 2.5; /archives//html/Amps/2008-01/msg00056.html (8,543 bytes)

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