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1. [Amps] Transformer guess? (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Sun, 26 Aug 2012 13:20:47 -0700; I have a small power transformer here, Philco 45-7011-7, which I would like to use for a screen supply. It has the usual center tapped HV winding, which measures 380-0-380v, just right, as well as 5v; /archives//html/Amps/2012-08/msg00452.html (7,476 bytes)
2. Re: [Amps] Transformer guess? (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 26 Aug 2012 16:35:35 -0400; Wire up a couple of diodes, a 500 Ohm resistor simulating a choke and a 10-20uF cap. With a variable bleeder adjust until the DC is .9 of the AC. I prefer the choke input as youre not at the mercy of; /archives//html/Amps/2012-08/msg00453.html (8,585 bytes)
3. Re: [Amps] Transformer guess? (score: 1): Author: Manfred Mornhinweg <manfred@ludens.cl>; Date: Sun, 26 Aug 2012 23:21:29 +0000; Vic, A simple rule for small transformers is that they are designed to have a voltage drop of close to 5% in each winding (10% total). This figure can vary a little, but not very much. At least it gi; /archives//html/Amps/2012-08/msg00455.html (7,792 bytes)
4. Re: [Amps] Transformer guess? (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Mon, 27 Aug 2012 08:18:32 +0100; Or it's a multi-winding transformer, which is exactly the case here. Also, in windings that are rated for a very low current, the manufacturer may use over-sized wire to help avoid breakages, so the; /archives//html/Amps/2012-08/msg00462.html (9,059 bytes)
5. Re: [Amps] Transformer guess? (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Mon, 27 Aug 2012 09:16:03 -0400; That Philco transformer is part of their "Universal" series and the 1952 catalog only goes to the -6 version. I'll check my later Radio Masters when I return after some errands. Carl KM1H ___________; /archives//html/Amps/2012-08/msg00468.html (10,307 bytes)
6. Re: [Amps] Transformer guess? (score: 1): Author: Radio WC6W <wc6w_amps@yahoo.com>; Date: Mon, 27 Aug 2012 10:12:42 -0700 (PDT); Hi Vic, If you can measure the cross section of the laminations (center post or sum of the side posts) there are old charts (i.e. 1976 ARRL Handbook, Transformer Rewinding, p.109) that show the pow; /archives//html/Amps/2012-08/msg00477.html (9,464 bytes)
7. Re: [Amps] Transformer guess? (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Mon, 27 Aug 2012 15:22:44 -0700; I haven't had a chance to actually try this yet, but since I am sitting at my 'work' computer, I simulated it with the PSU Designer program (which I think came with a recent ARRL handbook). I entered; /archives//html/Amps/2012-08/msg00488.html (10,245 bytes)

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