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121. [AMPS] test (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 12 Jan 2002 08:47:43 +0000; Maybe we all made a New Year's resolution to take the nice pink tablets every day? Don't worry - it won't last. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (; /archives//html/Amps/2002-01/msg00086.html (7,363 bytes)
122. [AMPS] amplifier help (score: 147): Author: Ian White <g3sek@ifwtech.com> (Ian White); Date: Wed, 16 Jan 2002 13:23:43 +0000; Forwarded from Steve, G8GSQ: When I worked making rf power transistors, 'pill' was used to describe the piece of BeO when it wasn't attached to the mounting flange. Skipp's comments were pretty compr; /archives//html/Amps/2002-01/msg00111.html (8,096 bytes)
123. [AMPS] pills and rc feedback (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 22 Jan 2002 08:23:45 +0000; ...in a subtle move to give anti-spam services a bad name? Well, it almost fits the facts. My ISP was another victim of this useless "service". SpamCop blocks mail from any ISP server that has been u; /archives//html/Amps/2002-01/msg00160.html (8,875 bytes)
124. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 Jan 2002 09:43:47 +0000; There are several downloadable articles at: http://www.ifwtech.com/g3sek/boards/tetrode/tetrode-3.htm MOSFETs are better than bipolars for this application, because they don't suffer from second brea; /archives//html/Amps/2002-01/msg00195.html (9,278 bytes)
125. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sun, 27 Jan 2002 18:58:31 +0000; Failures, you can never discount! It's very bad design to operate semiconductors from rail voltages that are above their breakdown voltage - even if they're never "supposed" to see that full voltage.; /archives//html/Amps/2002-01/msg00207.html (9,515 bytes)
126. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 Jan 2002 09:49:54 +0000; It doesn't make sense to spend money on a high-power, high-voltage zener (don't forget the heatsink) when you can uprate the shunt MOSFET for much less cost. The only exception would be if you insist; /archives//html/Amps/2002-01/msg00216.html (10,811 bytes)
127. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 Jan 2002 14:31:06 +0000; We're trying to solve two different problems here. One is transients, and all the methods Tom proposes are workable. For this particular application my own preference is Varistors, but it's no big de; /archives//html/Amps/2002-01/msg00229.html (11,495 bytes)
128. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 Jan 2002 19:35:07 +0000; Depends what you want the zeners to achieve - spike protection or something longer-term. That implies you were drawing less than 10mA total, to supply the screens for two tubes *and* bleed a keep-ali; /archives//html/Amps/2002-01/msg00232.html (12,610 bytes)
129. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 07:41:29 +0000; You forgot to add the engineering know-how to make it work... and that's priceless. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com; /archives//html/Amps/2002-01/msg00248.html (9,855 bytes)
130. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 08:05:45 +0000; I usually trim my quotes, but couldn't leave out any part of that good stuff. It shows that an idea that I'd though un-promising can be made to work well and reliably, but that's because Marv has the; /archives//html/Amps/2002-01/msg00249.html (13,615 bytes)
131. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:36:36 +0000; I should have said "won't cut it on their own" - and that rather proves the point. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/; /archives//html/Amps/2002-01/msg00260.html (10,648 bytes)
132. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:56:04 +0000; I am the only person in the world who sells such boards. If you have a specific accusation, then put up or back down. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for Ra; /archives//html/Amps/2002-01/msg00261.html (9,721 bytes)
133. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:51:34 +0000; There doesn't seem to be any real need for an active series element to feed an active MOSFET shunt regulator. The loop gain in the shunt part is already very high, so the series feed can be just a pl; /archives//html/Amps/2002-01/msg00262.html (11,451 bytes)
134. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 13:35:12 +0000; Not unless you have some very special iron. The anode-cathode voltage comes from two separate stacked power supplies, connected at the screen (chassis). Therefore the "anode" and "screen" supplies ea; /archives//html/Amps/2002-01/msg00263.html (10,880 bytes)
135. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 21:18:50 +0000; Good grief, Tom! I certainly *hope* there is a difference. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: htt; /archives//html/Amps/2002-01/msg00276.html (10,237 bytes)
136. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 21:29:20 +0000; My remark about "cheap zeners" came from an earlier statement by Rich: It had nothing to do with the alleged quality of the semiconductors. Put it down to the "common language" barrier. If the well-k; /archives//html/Amps/2002-01/msg00277.html (12,721 bytes)
137. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 29 Jan 2002 23:27:20 +0000; A small change in V for a given change in I is characteristic of *low* resistance, not high. Check the device data sheets for the definition of dynamic resistance, or almost any electronics textbook.; /archives//html/Amps/2002-01/msg00289.html (9,981 bytes)
138. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 30 Jan 2002 08:00:35 +0000; I'm not your personal Remedial Electronics coach. Go look it up. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WW; /archives//html/Amps/2002-01/msg00305.html (9,579 bytes)
139. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 30 Jan 2002 23:04:43 +0000; I apologise to the group for my contribution to this "catcalling". However severe the provocation, I should not have risen to it. For my point of view, please see: http://www.ifwtech.com/g3sek/boards; /archives//html/Amps/2002-01/msg00345.html (10,204 bytes)
140. [AMPS] Shunt regulated high voltage psu (score: 147): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 31 Jan 2002 14:33:35 +0000; I don't quote the figures because they're almost embarrassingly good. The output regulation, hum and noise are all typically below 100mV - a 4-1/2 digit DVM doesn't flicker between no load and full l; /archives//html/Amps/2002-01/msg00375.html (9,129 bytes)

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