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1. [Amps] Screen (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Fri, 03 Jun 2005 03:30:43 -0700; This is a question from a newbie. I'm using a 4X150A as a voltage controlled current sink (class A). My question is, can the transfer curve be modified (say to make it more linear) by _not_ using a f; /archives//html/Amps/2005-06/msg00006.html (6,109 bytes)
2. [Amps] overvoltage (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Sun, 05 Jun 2005 17:39:50 -0700; How do I overvoltage protect a MOSFET? I tried those gas discharge arrestors, but they don't cut off fast enough after they ignite. MOVs are too slow, and avalanche diodes can't take much dissipation; /archives//html/Amps/2005-06/msg00038.html (6,366 bytes)
3. [Amps] Magnetic shielding (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Sun, 19 Jun 2005 06:14:13 -0700; I had a 1.5 kW microwave oven transformer (MOT) that I took apart, removed the magnetic shunts, and when putting it back together, I interleaved the laminations (originally, all the Es were together; /archives//html/Amps/2005-06/msg00142.html (8,281 bytes)
4. Re: [Amps] Magnetic shielding 2 (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Sun, 19 Jun 2005 18:49:54 -0700; Thanks for the replies. The steel looks like grain oriented silicon steel, which I thought would be around 15; with the formula Will provided, I'm calculating about 19... I checked the secondary wave; /archives//html/Amps/2005-06/msg00157.html (8,341 bytes)
5. Re: [Amps] Magnetic shielding 2 (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Sun, 19 Jun 2005 21:31:22 -0700; I just want to let you guys know you've helped out a lot with the various suggestions, even though I'm not in radio, so I'm very grateful. OK, say I was to start from my requirements and fitting a tr; /archives//html/Amps/2005-06/msg00159.html (11,318 bytes)
6. Re: [Amps] HV Switch Mode Power Supplies (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Tue, 21 Jun 2005 17:55:58 -0700; I have a small 120 kV X-ray supply that needs 1 kHz 240 V input. I can get the 240 from the dryer outlet, but how do I design a 1 kHz switcher if I don't know the specific details of the transformer?; /archives//html/Amps/2005-06/msg00172.html (6,591 bytes)
7. [Amps] Newbie question (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Mon, 04 Jul 2005 05:39:02 -0700; I'm using 4X150A tubes for audio stuff. Other than voltage swing capability, what other characteristics does the grid driving circuit need? How low an output impedance, etc. _________________________; /archives//html/Amps/2005-07/msg00018.html (6,341 bytes)
8. [Amps] Kenotron tubes??? (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Thu, 07 Jul 2005 13:36:00 -0700; I got some antique kenotron tubes, but from what I can tell they are just high voltage rectifiers. Anyone here old enough to know if there's any difference between other tube rectifiers and kenotrons; /archives//html/Amps/2005-07/msg00053.html (6,574 bytes)
9. [Amps] Serious transformer problem (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Fri, 30 Jun 2006 21:10:01 -0700; I had rewound the secondaries on two 950 W power transformers a few months back, both identically, each with four identical windings side by side. I hadn't touched the primaries. There is a layer of; /archives//html/Amps/2006-07/msg00000.html (8,297 bytes)
10. Re: [Amps] Serious transformer problem (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Fri, 30 Jun 2006 23:08:05 -0700; The thing is, these were initially identical transformers, I just took them apart and replaced the secondaries. There's no difference between the cores. Since they do draw the same current from the m; /archives//html/Amps/2006-07/msg00002.html (13,199 bytes)
11. Re: [Amps] Serious transformer problem (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Sat, 01 Jul 2006 04:18:12 -0700; I got the following from rec.audio.tubes: "Such transformer primaries have very large and NON LINEAR impedances when tested with low and medium frequencies. Non linear in the sense that the impedance; /archives//html/Amps/2006-07/msg00004.html (9,116 bytes)
12. Re: [Amps] Amps Digest, Vol 43, Issue 134 (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Tue, 25 Jul 2006 05:23:38 -0700; Hi guys, I hope you don't mind me asking an audio-related question. I have electrostatic headphones (1 micron thick Mylar membrane that is charged to around 550 V, between two stators that get opposi; /archives//html/Amps/2006-07/msg01077.html (23,896 bytes)
13. Re: [Amps] Amps Digest, Vol 43, Issue 138 (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Tue, 25 Jul 2006 13:38:38 -0700; The stators are around each membrand and their DC bias is at zero volts, so they effectively shield the head from any potential (plus, the membranes are both at the same voltage, so there's no differ; /archives//html/Amps/2006-07/msg01120.html (8,058 bytes)
14. [Amps] Power factor and choke vs resonant-choke input supplies (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Wed, 09 May 2007 23:21:16 -0700; I'm interested in LC input supplies because they have excellent power factor, but I don't like the need for big chokes. I was looking at the resonant-choke input supply described at http://www.qsl.ne; /archives//html/Amps/2007-05/msg00102.html (6,628 bytes)
15. Re: [Amps] Power factor and choke vs resonant-choke input supplies (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Thu, 10 May 2007 06:01:07 -0700; I intend to use it for low power, low voltage stuff. :) I asked here since it's the place most people would be familiar with resonant chokes. My main question remains: that of power factor. _________; /archives//html/Amps/2007-05/msg00105.html (9,207 bytes)
16. [Amps] Need rectifiers for X-ray supply (score: 1): Author: Borislav Trifonov <bdt@shaw.ca>; Date: Thu, 21 Oct 2010 12:20:38 -0700; Hello gentlemen, I was using four GE KR-9A kenotrons (probably pre-1960s) to rectify 120 kV at (pulse driven average) 50 mA for my DIY X-ray setup. Didn't bother immersing in oil due to running at mu; /archives//html/Amps/2010-10/msg00339.html (7,327 bytes)

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