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Total 109 documents matching your query.

21. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
22. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
23. [AMPS] Shunt regulated high voltage psu (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 29 Jan 2002 10:31:23 -0000; Which just perhaps leads us back to Ian's comments on the Collins 30S1, big screen supply with choke input filter in series with anode supply, bias supply also stiff but value floating with mains var; /archives//html/Amps/2002-01/msg00251.html (15,367 bytes)
24. [AMPS] Shunt regulated high voltage psu (score: 1): Author: W8JI@akorn.net (Tom Rauch); Date: Tue, 29 Jan 2002 06:13:48 -0500; A handful of cheap zeners will cut it, if you power them from a separate dropping resistor and keep the current through them reasonably constant. What I have done is power very low wattage zeners fr; /archives//html/Amps/2002-01/msg00252.html (9,997 bytes)
25. [AMPS] Shunt regulated high voltage psu (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 29 Jan 2002 11:49:58 -0000; --Original Message-- From: Tom Rauch <w8ji@contesting.com> To: amps@contesting.com <amps@contesting.com>; Ian White, G3SEK <g3sek@ifwtech.com> To: <amps@contesting.com> Date: 29 January 2002 11:15 Su; /archives//html/Amps/2002-01/msg00253.html (10,410 bytes)
26. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Tue, 29 Jan 2002 04:59:10 -0800; - To ice the cake, one still needs a similar 400v zener string to protect the FET from Drain/Source breakdown. As I recall 500V C-E FETs go for a bit more than $1. Such a device also needs a heatsin; /archives//html/Amps/2002-01/msg00255.html (10,793 bytes)
27. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Tue, 29 Jan 2002 04:59:12 -0800; - The only person who used cheapie zeners is the one who sells sophisticated screen regulator boards. I used quality zeners at about 35% of the max diss rating (at 25ºC case temperature) becaus; /archives//html/Amps/2002-01/msg00256.html (10,445 bytes)
28. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Tue, 29 Jan 2002 04:59:14 -0800; - The screen supply in the 30S-1 supplies screen current and anode current to the 4cx1000A. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www; /archives//html/Amps/2002-01/msg00257.html (9,441 bytes)
29. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
30. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
31. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
32. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
33. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Tue, 29 Jan 2002 14:18:11 -0000; My understanding is that when you let grid and screen both float, you get better constancy of the zero signal current. That's as compared with letting one float and one be stabilised. I prefer the 's; /archives//html/Amps/2002-01/msg00264.html (9,686 bytes)
34. [AMPS] Shunt regulated high voltage psu (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 29 Jan 2002 11:57:32 -0500; Yes.....but a shunt regulator with a two-transistor regulator is very simple and reliable, and has no response time problems. So it is possible to use a very simple circuit that uses zeners if you "; /archives//html/Amps/2002-01/msg00268.html (9,627 bytes)
35. [AMPS] Shunt regulated high voltage psu (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Tue, 29 Jan 2002 11:57:32 -0500; Is this anything like the only person in the world claiming parasitics cause all sorts of problems in amplifiers being the person who sells nichrome suppressors? 73, Tom W8JI W8JI@contesting.com --; /archives//html/Amps/2002-01/msg00269.html (9,802 bytes)
36. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Tue, 29 Jan 2002 09:37:44 -0800; - These supplies use resonant-choke filters. With simle choke filters, the transient V-reg. on SSB would have been unsatisfactory. - Amen, Ian - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, ww; /archives//html/Amps/2002-01/msg00270.html (10,580 bytes)
37. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Tue, 29 Jan 2002 09:37:46 -0800; - Bargain-price/cheapie/fallout zeners diodes are basically units that fail to pass the manufacturer's final test. I was given a box of them which was marked "semiconductor scrap". Some were usuable; /archives//html/Amps/2002-01/msg00271.html (9,859 bytes)
38. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Tue, 29 Jan 2002 09:37:48 -0800; - In Class AB1, regulated grid bias V is seeningly not an advantage since there is zero current flow. For a tetrode, if the anode V increases, ZSAC increases. If the increase was due to a rise in ma; /archives//html/Amps/2002-01/msg00272.html (10,087 bytes)
39. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Tue, 29 Jan 2002 09:45:18 -0800; <snip> <snip> first-class, in Zeners? Having fabricated a lot of these (starting with undoped silicon), the "fallout" in manufacturing is usually -- oops! missed the target avalanche voltage! -- or; /archives//html/Amps/2002-01/msg00273.html (10,775 bytes)
40. [AMPS] Shunt regulated high voltage psu (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 29 Jan 2002 18:39:00 -0000; of a Certainly, in that configuration. There's numerous valves where the reverse screen current appears to low or non-existent (4CX800 for example), where dumping 40+mA all the time in a shunt regula; /archives//html/Amps/2002-01/msg00274.html (12,642 bytes)

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