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21. Re: [Amps] power supply transformer (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Fri, 02 Feb 2007 11:39:37 -0300; Hi all! With so much discussion going on, I will add my half cent worth on two issues. First: Exactly. It can be perfectly safe to run an amplifier or other device directly from the line, without any; /archives//html/Amps/2007-02/msg00007.html (10,627 bytes)
22. Re: [Amps] power supply transformer (score: 1): Author: kg7hf@comcast.net; Date: Fri, 02 Feb 2007 21:53:15 +0000; Hi Manfred, My original thoughts were not to use a transformer, I had never seen a 'real' design, besides a switched mode power supply that did not have an isolation transformer on the mains before a; /archives//html/Amps/2007-02/msg00024.html (8,842 bytes)
23. Re: [Amps] power supply transformer (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 4 Feb 2007 12:16:45 +0100 (CET); Paul, If you run the amp directly off the rectified 117 (or whatever) line voltage, tehre's an insulation requirement between the drains of teeh MOSFETS and the RF output winding, which is grounded.; /archives//html/Amps/2007-02/msg00028.html (8,068 bytes)
24. Re: [Amps] power supply transformer (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sun, 4 Feb 2007 13:00:57 +0100; Direct rectified power supplies will not work with a GFCI, as the neutral and safety ground must be always bonded together. On a correctly built direct rectified power supply there will be ALWAYS neu; /archives//html/Amps/2007-02/msg00029.html (8,171 bytes)
25. Re: [Amps] power supply transformer (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 4 Feb 2007 07:40:05 -0500; Not if the device meets codes. A neutral is not allowed to be connected to exposed chassis or to the safety ground anyplace except at the mains panel. 73 Tom ________________________________________; /archives//html/Amps/2007-02/msg00033.html (7,973 bytes)
26. Re: [Amps] power supply transformer (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sun, 4 Feb 2007 17:38:53 +0100 (CET); or to the safety ground anyplace except at the mains panel.< That's the case in the UK, too. The problem comes when you connect your external RF ground to the mains ground - in the event of a rupture; /archives//html/Amps/2007-02/msg00039.html (8,512 bytes)
27. Re: [Amps] power supply transformer (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Mon, 05 Feb 2007 10:11:31 -0300; Hi Paul, Peter C., Peter V., Tom, and all! As usual, I come late, but I will still add my comments to this thread. Google for the "all-american five" design for tube type radios, which was used in co; /archives//html/Amps/2007-02/msg00049.html (20,487 bytes)
28. Re: [Amps] power supply transformer (score: 1): Author: "Jim Tonne" <tonne@comcast.net>; Date: Mon, 5 Feb 2007 09:07:43 -0500; Manfred: Nice solid discussion! Thanks. - JimT WB6BLD _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2007-02/msg00050.html (7,566 bytes)
29. Re: [Amps] power supply transformer (score: 1): Author: "Robert B. Bonner" <rbonner@qro.com>; Date: Mon, 5 Feb 2007 11:55:32 -0600; Yes Manfred we have already been past the "All American Five about a week ago. That design would never be UL approved in 2007. It was also the absolutely favorite weapon to murder your spouse from 19; /archives//html/Amps/2007-02/msg00052.html (22,548 bytes)

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