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Total 9 documents matching your query.

1. [Amps] Step-start; improved circuit. (score: 1): Author: Mark K5AM <k5am@zianet.com>; Date: Sat, 07 Mar 2009 02:30:19 +0000; Some step-start circuit troubles have been reported recently. The step-start circuit usually seen can sometimes cause trouble; the problem is that the relay coil is part of the RC timing circuit. Thi; /archives//html/Amps/2009-03/msg00225.html (7,028 bytes)
2. Re: [Amps] Step-start; improved circuit. (score: 1): Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>; Date: Sat, 07 Mar 2009 07:55:30 -0500; I have to agree whole heartedly. While many conventional step start circuits have worked flawlessly for years, even decades, I was never completely satisfied with any arrangement that had the relay v; /archives//html/Amps/2009-03/msg00226.html (8,124 bytes)
3. Re: [Amps] Step-start; improved circuit. (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Sat, 07 Mar 2009 05:24:36 -0800; For relay driving I prefer the 555 timer as it does not require a drive transistor to the relay, fewer parts to make a good quality timer. David G3UNA _______________________________________________; /archives//html/Amps/2009-03/msg00227.html (9,359 bytes)
4. Re: [Amps] Step-start; improved circuit. (score: 1): Author: TexasRF@aol.com; Date: Sat, 7 Mar 2009 09:07:10 EST; Also, there is a series of Dayton timer modules in the W.W. Grainger catalog. Most are adjustable over a 10 to 1 time range. 120vac on the input terminal delivers about 119 vac to the output terminal; /archives//html/Amps/2009-03/msg00228.html (10,297 bytes)
5. Re: [Amps] Step-start; improved circuit. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 7 Mar 2009 09:35:33 -0500; I just use a 20 Ohm 50W resistor on my 2M amp but the relay is a 40A contactor <G> It goes "thud" rather quick and not a gradual closing. It keeps the 3CX1000A7 (5V/30A filament) contented as well as; /archives//html/Amps/2009-03/msg00229.html (11,483 bytes)
6. Re: [Amps] Step-start; improved circuit. (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Sat, 7 Mar 2009 07:02:54 -0800; As a member of the KIRSS fan club (Keep it really simple stupid), I have never had a problem with the contacts on a simple step-start circuit. All you need is a cycle or two delay and if the delay is; /archives//html/Amps/2009-03/msg00230.html (8,160 bytes)
7. Re: [Amps] Step-start; improved circuit. (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 08 Mar 2009 07:42:35 +0000; I do a similar thing, but with a RC feeding the gate of a MOSFET with the relay in the drain. The turn on characteristics provide enough of a 'snap' action to activate the relay cleanly. Delightfull; /archives//html/Amps/2009-03/msg00239.html (8,614 bytes)
8. Re: [Amps] Step-start; improved circuit. (score: 1): Author: Paul Kelley N1BUG <paul.kelley.n1bug@gmail.com>; Date: Sun, 08 Mar 2009 07:31:53 -0400; I think I used an LM311 comparator and a PN2222A transistor because I have a lifetime supply of both and they were adequate for the application. I am now in the process of drafting schematics for all; /archives//html/Amps/2009-03/msg00240.html (8,290 bytes)
9. Re: [Amps] Step-start; improved circuit. (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Sun, 08 Mar 2009 21:25:52 -0400; It's been my approach that other than a minimum for each tube, the timing is unimportant. IOW if the tube needs 300 ms, anything longer than that within reason such as 3, or 4, or 5 seconds shouldn'; /archives//html/Amps/2009-03/msg00247.html (8,359 bytes)

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