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1. [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Thu, 25 Jan 2007 12:58:08 +0000; I am not sure I'm sending this correctly, but here goes. I want to build a 120 volt DC source that can supply ~35 amps. I would like to have the primary either 240 (typical) or 120 v AC. It doesn't h; /archives//html/Amps/2007-01/msg00258.html (6,705 bytes)
2. Re: [Amps] power supply transformer (score: 1): Author: "Robert B. Bonner" <rbonner@qro.com>; Date: Thu, 25 Jan 2007 09:46:10 -0600; I used to make jokes about rectifying the line cord. Or even throwing a wire up over the powerline and rectifying it for the power amp. Using a transformer isolates your circuit from the mains. I was; /archives//html/Amps/2007-01/msg00259.html (8,939 bytes)
3. Re: [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Thu, 25 Jan 2007 18:37:49 +0000; Thanks to everyone for the information, especially the information on "direct rectification" of the ac mains. I hadn't thought about the DC current being an issue on the neutral side, is that really; /archives//html/Amps/2007-01/msg00260.html (8,317 bytes)
4. Re: [Amps] power supply transformer (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 25 Jan 2007 19:13:48 +0000; You could keep an eye open for high current 48V switching psus which tend to be relatively cheap. Most will wind up at least 10% on the output voltage, then stack two in series. Steve _______________; /archives//html/Amps/2007-01/msg00261.html (6,688 bytes)
5. Re: [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Tue, 30 Jan 2007 19:17:24 +0000; Back to transformers! Would something like this work as an isolation transformer? It doesn't exactly meet my requirements of being 120v/240v primary (switchable), but maybe 277v is close enough to 22; /archives//html/Amps/2007-01/msg00332.html (8,158 bytes)
6. Re: [Amps] power supply transformer (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 30 Jan 2007 14:43:28 -0500; What are you trying to do? Build a high current power supply? If so the type of supply filtering circuit and desired voltage regulation is critical to the transformer you pick. 73, Tom W8JI _________; /archives//html/Amps/2007-01/msg00333.html (7,269 bytes)
7. Re: [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Tue, 30 Jan 2007 20:15:39 +0000; Hi Tom, It probably did seem a bit strange. Basically, I need to make a power supply capable of around 100v @ 30A. It does not need to be regulated, but should be well filtered as it will be in a sol; /archives//html/Amps/2007-01/msg00334.html (8,414 bytes)
8. Re: [Amps] power supply transformer (score: 1): Author: "Roy Koeppe" <royanjoy@ncn.net>; Date: Tue, 30 Jan 2007 14:48:57 -0600; About, "Why do I need to use a transformer in the first place, can I not simply rectify and filter the two legs of the 240 without a transformer?" A full wave rectifier (not a bridge) utilizing a cho; /archives//html/Amps/2007-01/msg00335.html (7,504 bytes)
9. Re: [Amps] power supply transformer (score: 1): Author: "Robert B. Bonner" <rbonner@qro.com>; Date: Tue, 30 Jan 2007 15:10:01 -0600; I covered that about a week ago. BOB DD About, "Why do I need to use a transformer in the first place, can I not simply rectify and filter the two legs of the 240 without a transformer?" A full wave; /archives//html/Amps/2007-01/msg00336.html (8,347 bytes)
10. Re: [Amps] power supply transformer (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 30 Jan 2007 17:13:52 -0500; When people make line isolation transformers or control transformers they use the smallest amount of copper they can. The resistance of the winding limits peak current. The power factor will kill re; /archives//html/Amps/2007-01/msg00337.html (9,513 bytes)
11. Re: [Amps] power supply transformer (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Tue, 30 Jan 2007 22:15:07 -0800; Sounds like a good application for a switch-mode supply. Mike W4EF.............................. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.con; /archives//html/Amps/2007-01/msg00338.html (9,132 bytes)
12. [Amps] power supply transformer (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Wed, 31 Jan 2007 07:21:21 -0800 (PST); Paul, you have to have a line transformer for isolation - it is life and death - no discussion possible... Secondly, (as an old Plant Engineer) have you priced the Square D transformer... You are lik; /archives//html/Amps/2007-01/msg00342.html (6,820 bytes)
13. Re: [Amps] power supply transformer (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Wed, 31 Jan 2007 12:32:02 -0500; Not that he should do it (for other reasons), but there is a great deal of equipment we use every day that runs power supplies that are not isolated from the power line. The problem is getting the h; /archives//html/Amps/2007-01/msg00343.html (8,098 bytes)
14. Re: [Amps] power supply transformer (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 31 Jan 2007 12:43:07 -0500; Commercial ham gear did the same thing in the past. Look at some Johnson schematics for their old transmitters. Others did it, too. David KC2JD/4 _______________________________________________ Amps; /archives//html/Amps/2007-01/msg00344.html (9,158 bytes)
15. Re: [Amps] power supply transformer (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 31 Jan 2007 18:59:58 +0100 (CET); schematics for their old transmitters. Others did it, too.< Doesn't mean it was good practice, or safe, though. 73 Peter W7/G3RZP (this week) _______________________________________________ Amps mail; /archives//html/Amps/2007-01/msg00345.html (8,650 bytes)
16. Re: [Amps] power supply transformer (score: 1): Author: "David C. Hallam" <dhallam@rapidsys.com>; Date: Wed, 31 Jan 2007 13:26:28 -0500; No it wasn't safe at all. I did not mean to imply that it was, only that commercial manufacturers were/are guilty of unsafe practices, too. David KC2JD/4 --Original Message-- From: Peter Chadwick [ma; /archives//html/Amps/2007-01/msg00346.html (8,901 bytes)
17. Re: [Amps] power supply transformer (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Wed, 31 Jan 2007 13:56:12 -0600; I have a Collins 28 volt 100 amp power supply here in great condition. Someone make me an offer I can't refuse.... (((73))) Phil, K5PC _______________________________________________ Amps mailing lis; /archives//html/Amps/2007-01/msg00347.html (10,667 bytes)
18. Re: [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Wed, 31 Jan 2007 21:36:36 +0000; Would that be 28v AC @100 amps? Then use a voltage tripler to get to 119? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis; /archives//html/Amps/2007-01/msg00348.html (10,782 bytes)
19. Re: [Amps] power supply transformer (score: 1): Author: "Patrick A. Thompson Sr." <wa4tuk-rf@comcast.net>; Date: Wed, 31 Jan 2007 20:17:41 -0500; This is related but not quite on topic. What are the transformer design differences between, for instance, a transformer designed to convert 480vac to 120vac and is labeled a control transformer, to; /archives//html/Amps/2007-01/msg00350.html (9,110 bytes)
20. Re: [Amps] power supply transformer (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Thu, 1 Feb 2007 05:53:51 -0500; Transformers used in capacitor input supplies require special design care for good or optimum performance. Capacitor input supplies draw current from the power mains and power transformer only over; /archives//html/Amps/2007-02/msg00001.html (9,053 bytes)

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