Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Step\s+start\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+Step\s+start\s*$/: 45 ]

Total 45 documents matching your query.

1. Re: [Amps] Step Start (score: 1): Author: <sccook1@cox.net>; Date: Fri, 12 Aug 2005 10:56:16 -0400; Seems like the delay would only need to be long enough to limit the inrush current to the safe level specified for the tube filament and power supply diodes. In most cases I've encounter, 1/2 to 1 se; /archives//html/Amps/2005-08/msg00428.html (10,572 bytes)
2. Re: [Amps] Step Start (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 12 Aug 2005 11:35:36 -0400; Speaking of Step-Start circuits, I recommend placing a fuse of suitable size in series with one of the step-start resistors. If the circuit "steps" but fails to "start," which results in a failure o; /archives//html/Amps/2005-08/msg00431.html (7,816 bytes)
3. Re: [Amps] Step Start (score: 1): Author: gdaught6@stanford.edu; Date: Fri, 12 Aug 2005 09:14:14 -0700; Hi all, While we're on the subject of soft/step start circuits, I'd like to ask a question that I've had for years, but never asked until now: Why do most step-start circuits in the primary of the HV; /archives//html/Amps/2005-08/msg00438.html (7,367 bytes)
4. Re: [Amps] Step Start (score: 1): Author: Colin Lamb <k7fm@teleport.com>; Date: Fri, 12 Aug 2005 09:49:21 -0700 (GMT-07:00); George asked: "Why do most step-start circuits in the primary of the HV transformer have tow resistors and relay contacts shorting the resistors in EACH (i.e. BOTH) leads of the primary? Doesn't a si; /archives//html/Amps/2005-08/msg00440.html (8,824 bytes)
5. Re: [Amps] Step Start (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 12 Aug 2005 14:14:47 -0700; So that it will work right on either 120v Or 240v mains. In a 240v only amplifier, yes. Richard L. Measures, AG6K, 805.386.3734. www.somis.org _______________________________________________ Amps mai; /archives//html/Amps/2005-08/msg00448.html (8,076 bytes)
6. Re: [Amps] Step Start (score: 1): Author: gdaught6@stanford.edu; Date: Fri, 12 Aug 2005 17:13:32 -0700; OK, the consensus response to my question: seems to be... As Rich and others have pointed out. But the two-resistor scheme has overflowed into the 240V only power supplies, probably due simply to "co; /archives//html/Amps/2005-08/msg00457.html (7,531 bytes)
7. Re: [Amps] Step Start (score: 1): Author: R.Measures <r@somis.org>; Date: Fri, 12 Aug 2005 19:16:36 -0700; I have built two 240v-only amplifiers, and I am slowly building a third, All three use a SPST DC-coil stepstart relay and a single resistor. If it's a single V only amplifier, a single resistor will; /archives//html/Amps/2005-08/msg00458.html (8,525 bytes)
8. [Amps] Step start (score: 1): Author: "Patrick Egloff" <pegloff@gmail.com>; Date: Sun, 3 Feb 2008 08:04:08 +0100; Hi All, The purpose of a step-start is (mainly) to let the HV caps load smoothly. The "classical" way to make a step-start is to short the resistor in the HV transformer primary with a relay switched; /archives//html/Amps/2008-02/msg00003.html (7,239 bytes)
9. Re: [Amps] Step start (score: 1): Author: "kenw2dtc" <kenw2dtc@comcast.net>; Date: Sun, 3 Feb 2008 02:15:03 -0500; Hi Patrick, Well there is nothing wrong with the concept, but I like to keep the fewest wires connected to the high voltage. I also don't need the super fast charge either, I have a 30 second startu; /archives//html/Amps/2008-02/msg00004.html (7,466 bytes)
10. Re: [Amps] Step start (score: 1): Author: Don Kessler <ki6sz@sbcglobal.net>; Date: Sun, 3 Feb 2008 02:46:52 -0500; I also thought that the step-start was to limit the inrush current to the cold filaments. Also -- The initial inrush current is sufficient to weld the contacts in the main power switch -- I've had to; /archives//html/Amps/2008-02/msg00005.html (7,315 bytes)
11. Re: [Amps] Step start (score: 1): Author: Per Molund <pmolund@online.no>; Date: Sun, 03 Feb 2008 11:02:07 +0100; Has anyone tried the SSC-25 soft start controller from United Automation for this purpose? <http://www.powercontrollers.net/components/soft_start_module/specialised_power_products_ssc_25.asp> 73, Per; /archives//html/Amps/2008-02/msg00006.html (7,953 bytes)
12. Re: [Amps] Step start (score: 1): Author: "Han Higasa" <higasa@plum.ocn.ne.jp>; Date: Sun, 3 Feb 2008 21:49:16 +0900; Hi all, The primary and the only purpose of a step-start circuitry is to avoid inrush current and to protect filaments, rectifier diodes, capacitors and other circuit components from a disaster by a; /archives//html/Amps/2008-02/msg00007.html (7,716 bytes)
13. Re: [Amps] Step start (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sun, 3 Feb 2008 13:56:07 +0100; It does not matter for the HV caps how fast they are loaded. The reason for a step-start circuit is to limit the supply current to a value below that of a typical household circuit breaker. As long t; /archives//html/Amps/2008-02/msg00008.html (7,807 bytes)
14. Re: [Amps] Step start (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sun, 3 Feb 2008 13:22:54 -0000; Well over-priced compared to a relay and hand full of parts. David G3UNA _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/list; /archives//html/Amps/2008-02/msg00009.html (7,867 bytes)
15. Re: [Amps] Step start (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sun, 3 Feb 2008 13:41:29 -0000; I have a 240V 15A variac which would consistently blow a 13A plug fuse at switch on, unloaded. The spec for these plug fuses states they must blow in 30s with 2.1 x nominal current applied, ie >27A:; /archives//html/Amps/2008-02/msg00010.html (8,244 bytes)
16. Re: [Amps] Step start (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sun, 3 Feb 2008 16:36:34 +0100; That is one of the reasons that standard solid state relays will not soft start transformers as they won´t switch on the peak of the sine wave but at zero volts 73 Peter I have a 240V 15A varia; /archives//html/Amps/2008-02/msg00011.html (8,251 bytes)
17. Re: [Amps] Step start (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 3 Feb 2008 11:35:14 -0500; As David said step starts circuits are simple. There is no need for a timer etc. In a couple of supplies that I have I just place a low value resistor in series with the mains and place the relay coi; /archives//html/Amps/2008-02/msg00013.html (10,825 bytes)
18. Re: [Amps] Step start (score: 1): Author: "Patrick Egloff" <pegloff@gmail.com>; Date: Sun, 3 Feb 2008 20:38:41 +0100; Hi All, Thanks for all these answers. It was only a guess but my idea was not so bad....hi hi I made my HV voltage like this : http://tk5ep.free.fr/tech/PA2m/img/HV_supply.gif The step-start uses a 1; /archives//html/Amps/2008-02/msg00015.html (8,122 bytes)
19. Re: [Amps] Step start (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Sun, 3 Feb 2008 16:17:14 -0800 (PST); Hi Patrick, I've done it, by means of your proposed method, on supplies ranging from 12 to 3000 volts. I've mostly employed a TL431 for the sensor/relay driver. 73 & Good afternoon, Marv WC6W http://; /archives//html/Amps/2008-02/msg00018.html (9,183 bytes)
20. Re: [Amps] Step start (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 05 Feb 2008 21:53:09 +0000; As other replies show, people do it both ways - as have I. One thought relates to the (very rare) situation where there's a fault in the transformer or ht system that results in heavy current draw a; /archives//html/Amps/2008-02/msg00027.html (8,424 bytes)

Current List: 1 - 20
Page: [1] [2] [3]