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Total 109 documents matching your query.

1. [AMPS] Shunt regulated high voltage psu (score: 1): Author: bx_ham@yahoo.com (Sandeep); Date: Sun, 27 Jan 2002 15:26:03 +0530; Hi I need a 350 volts regulated power supply for a 4cx250 Linear Amp. I have 650 volt unregulated available. The original circuit used a regulator with valves. I want to use solid state devices. I ha; /archives//html/Amps/2002-01/msg00194.html (8,400 bytes)
2. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
3. [AMPS] Shunt regulated high voltage psu (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Sun, 27 Jan 2002 09:58:22 -0800; On Sun, 27 Jan 2002 09:43:47 +0000 "Ian White, G3SEK" <G3SEK@ifwtech.com> writes: <snip> unregulated Hi Ian, The IRF840 should be fine in a properly designed shunt regulator at 350V, as the transisto; /archives//html/Amps/2002-01/msg00197.html (9,356 bytes)
4. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
5. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Sun, 27 Jan 2002 17:02:15 -0800; Sandeep: The 4cx250B and R have: a low screen current requirement in linear service and a tendency to generate dangerous reverse screen-current. These two factors make the shunt zener screen regulat; /archives//html/Amps/2002-01/msg00212.html (10,248 bytes)
6. [AMPS] Shunt regulated high voltage psu (score: 1): Author: W8JI@akorn.net (Tom Rauch); Date: Sun, 27 Jan 2002 23:40:30 -0500; .......or to clamp the shunt side of the series resistor with a large zener with a capacitor across. You can use a zener clamp rated below the maximum voltage breakdown of the shunt device, and abov; /archives//html/Amps/2002-01/msg00213.html (8,947 bytes)
7. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Sun, 27 Jan 2002 21:40:32 -0800; // Why not use a simple zener-string shunt regulator and obviate the needless complexity? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.c; /archives//html/Amps/2002-01/msg00214.html (9,724 bytes)
8. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
9. [AMPS] Shunt regulated high voltage psu (score: 1): Author: W8JI@akorn.net (Tom Rauch); Date: Mon, 28 Jan 2002 07:42:49 -0500; Why would you need a high power zener? The zener doesn't regulate anything, it is just a safety device in case you get a millisecond or two glitch. It is a hard clamp for quick transients. It will f; /archives//html/Amps/2002-01/msg00218.html (10,142 bytes)
10. FW: [AMPS] Shunt regulated high voltage psu (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Mon, 28 Jan 2002 13:11:26 -0000; -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com; /archives//html/Amps/2002-01/msg00219.html (9,807 bytes)
11. FW: [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Mon, 28 Jan 2002 08:08:32 -0800; produced // The quality of regulation depends on using quality zeners and understanding the Looneytunes dissipation ratings -- i.e., don't exceed more than c. 35% of the diss. rating and put the zen; /archives//html/Amps/2002-01/msg00221.html (10,551 bytes)
12. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Mon, 28 Jan 2002 08:08:35 -0800; // Agreed. But does it make sense to use inexpensive 20v - 30 V. 5W axial lead zeners which require no heatsink? // Powering the 400V screen regulator from the +1200V mid-point of the +2400V FWD ano; /archives//html/Amps/2002-01/msg00222.html (12,807 bytes)
13. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Mon, 28 Jan 2002 08:08:36 -0800; // More money than common-sense? // Good point, Mr. Rauch. // Amen. I have never seen a zener fail to short during a glitch. ** A Lexguard® shrapnel shield is advisable for the operator. cheers,; /archives//html/Amps/2002-01/msg00223.html (11,157 bytes)
14. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
15. [AMPS] Shunt regulated high voltage psu (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Mon, 28 Jan 2002 10:56:52 -0800; On Mon, 28 Jan 2002 14:31:06 +0000 "Ian White, G3SEK" <G3SEK@ifwtech.com> writes: <snip> I've been running my 4CX1500B like that for... 15 years. The low end of the plate supply bleed (50K from 3 KV); /archives//html/Amps/2002-01/msg00231.html (10,242 bytes)
16. [AMPS] Shunt regulated high voltage psu (score: 1): 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)
17. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 28 Jan 2002 19:58:55 +0000; Thanks, Marv - I'm pleased to learn it can be done reliably. Is this with an active regulator or with zeners? -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RS; /archives//html/Amps/2002-01/msg00233.html (10,501 bytes)
18. [AMPS] Shunt regulated high voltage psu (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Mon, 28 Jan 2002 13:36:53 -0800; On Mon, 28 Jan 2002 19:58:55 +0000 "Ian White, G3SEK" <G3SEK@ifwtech.com> writes: end source. the wires Hi Ian, The shunt regulator consists of a venerable uA723 regulator IC driving a FET. The FET i; /archives//html/Amps/2002-01/msg00235.html (13,053 bytes)
19. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Mon, 28 Jan 2002 16:46:29 -0800; Regulated screen V. Yes. 10mA -5MA = 5mA. 5mA is enough to bias the zeners, Hello. Zener diodes regulate voltage. In 1955, one used VR-105 and VR150 regulator tubes. I tried the eimac recommendation; /archives//html/Amps/2002-01/msg00240.html (13,097 bytes)
20. [AMPS] Shunt regulated high voltage psu (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Mon, 28 Jan 2002 17:32:16 -0800; <snip> at 4cx250B for Hi Rich, Well, it may be cute to tile a vectorboard with those but, it isn't economic at $16. A suitable power FET costs a $1 these days. Add another $1 for a voltage regulator; /archives//html/Amps/2002-01/msg00242.html (10,298 bytes)

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