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1. [Amps] Transformer question (score: 1): Author: K1LE at ARRL.NET (Jeffrey Madore); Date: Thu May 8 08:54:27 2003; I have a transformer question that someone might be able to shed some light on. Last fall I picked up 3 similar power supplies at the flea market at MIT. I believe they were designed to support some; /archives//html/Amps/2003-05/msg00062.html (9,446 bytes)
2. [Amps] Transformer question (score: 1): Author: MM at plextek.co.uk (Mark Marsden); Date: Fri May 9 08:47:16 2003; Hi Jeffrey What you have there is a classic ferroresonant Constant Voltage Transformer. The capacitor and second primary winding are resonant at mains frequency Stabilisation is achieved by core satu; /archives//html/Amps/2003-05/msg00064.html (9,262 bytes)
3. [Amps] Transformer question (score: 1): Author: dhearn at ix.netcom.com (Dan); Date: Fri May 9 08:47:19 2003; I believe you have answered your own question, Jeff. Transformers of this general type, with a tuned third winding were built by Sola, Raytheon and probablly others. Usually they were used to regulat; /archives//html/Amps/2003-05/msg00065.html (10,194 bytes)
4. [Amps] Transformer question (score: 1): Author: garyschafer at attbi.com (Gary Schafer); Date: Fri May 9 08:47:21 2003; Hi Jeff, What you have is a ferro-resonant transformer. That was used quite extensively in battery chargers for the marine industry. It provides a fairly good regulation with wide variations in load; /archives//html/Amps/2003-05/msg00066.html (10,914 bytes)
5. [Amps] Transformer question (score: 1): Author: wc6w at juno.com (Radio WC6W); Date: Fri May 9 08:47:26 2003; On Wed, 7 May 2003 11:56:54 -0400 "Jeffrey Madore" <K1LE@ARRL.NET> writes: <snip> Hi Jeff, Sounds like you have a constant voltage transformer. A modern relic. The extra winding with the capacitor is; /archives//html/Amps/2003-05/msg00068.html (9,326 bytes)
6. [Amps] Transformer question (score: 1): Author: wb8jkr at juno.com (wb8jkr@juno.com); Date: Fri May 9 08:47:29 2003; Its a "ferro-resonant" transformer. Its designed to be a regulating transformer and under little or no load actually puts out a square wave. The core operates in a saturated mode, these transformers; /archives//html/Amps/2003-05/msg00069.html (11,233 bytes)
7. [Amps] Transformer question (score: 1): Author: K1LE at ARRL.NET (Jeffrey Madore); Date: Thu May 15 19:31:58 2003; Thank you! for the many replies to my questions pertaining to the transformer / AC capacitor combination. The output is indeed a square wave that modifies a bit with changing load. It appears that th; /archives//html/Amps/2003-05/msg00122.html (9,952 bytes)
8. [Amps] Transformer question (score: 1): Author: drkirkby@ntlworld.com (Dr. David Kirkby); Date: Wed, 08 May 2002 11:35:51 +0100; With all the questions about transformers on here, I thought I'd add this and would be interested in comments. About 10 years ago, a friend was building a twin 4CX1000A amplifier. A company (which I; /archives//html/Amps/2002-05/msg00076.html (8,959 bytes)
9. [Amps] Transformer question (score: 1): Author: w8ron@stratos.net (Ron); Date: Wed, 08 May 2002 16:10:39 -0400; Hi David. It sounds similar to the designs used in microwave ovens that has been discussed several times on these groups where a matgnetic shunt is placed so that the primary flux has an alternate pa; /archives//html/Amps/2002-05/msg00080.html (10,602 bytes)
10. [Amps] Transformer question (score: 1): Author: drkirkby@ntlworld.com (Dr. David Kirkby); Date: Wed, 08 May 2002 16:51:28 +0100; Could be, but at least a microwave oven transformer is capable of supplying some power - this thing was supplying virtually nothing. Had even the primary current been 3.15A @ 240 V, it would imply a; /archives//html/Amps/2002-05/msg00094.html (7,791 bytes)
11. [Amps] Transformer Question (score: 1): Author: 2@mail.vcnet.com (Richard); Date: Sun, 12 May 2002 16:08:05 -0700; Does anyone have any info on amorphous core transformers? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-05/msg00144.html (6,570 bytes)
12. [Amps] Transformer question (score: 1): Author: "k7rdx" <k7rdx@charter.net>; Date: Sat, 7 Jul 2007 20:09:21 -0700; I have a 2kva isolation/240-120 step down transformer I want to use to power a rf deck with 120v filament transformer&blower. Is it necessary to switch the 240 primary or can the primary be hooked di; /archives//html/Amps/2007-07/msg00081.html (6,342 bytes)
13. Re: [Amps] Transformer question (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sun, 8 Jul 2007 10:43:43 -0400; Maybe Im a little dense but I have no idea what you are asking. If the plate transformer runs on 240 and the rest on 120 you do not need a separate 120 line. Simply use one leg of the 240 line agains; /archives//html/Amps/2007-07/msg00085.html (7,680 bytes)
14. Re: [Amps] Transformer question (score: 1): Author: "k7rdx" <k7rdx@charter.net>; Date: Sun, 8 Jul 2007 08:13:41 -0700; I understand what your`e saying...Iv`e done it that way many times too,what I want to do is run a balanced input drawing equal current from both legs of the 240v ac mains as well as isolating the rf; /archives//html/Amps/2007-07/msg00086.html (8,806 bytes)
15. Re: [Amps] Transformer question (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 8 Jul 2007 11:59:16 -0400; Not only that, it is illegal and a shock hazard to use the ground wire as a neutral. You would need a four wire outlet or otherwise somehow ensure the power return neutral was isolated from the chas; /archives//html/Amps/2007-07/msg00087.html (7,435 bytes)
16. Re: [Amps] Transformer question (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sun, 8 Jul 2007 13:40:53 -0400; So then why do amps that offer 120/240 VAC options do it that way? The NEC manual for Resedential Wiring requires both a neutral and a ground at the panel as well as in the distribution wiring. For; /archives//html/Amps/2007-07/msg00088.html (8,438 bytes)
17. Re: [Amps] Transformer question (score: 1): Author: "k7rdx" <k7rdx@charter.net>; Date: Sun, 8 Jul 2007 11:10:26 -0700; I have always isolated the neutral from chassis in my amps and I know for a fact that running 120vac filament transformers,120vac blower,relay supplys,primary switching relays,etc has to unbalance th; /archives//html/Amps/2007-07/msg00089.html (8,740 bytes)
18. Re: [Amps] Transformer question (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 8 Jul 2007 15:36:33 -0400; This really isn't complicated. If you have the neutral connected to the safety ground or to the chassis of any device at any point other than the main panel, you have faulty wiring. If there is any; /archives//html/Amps/2007-07/msg00092.html (8,760 bytes)
19. Re: [Amps] Transformer question (score: 1): Author: "jeremy-ca" <km1h@jeremy.mv.com>; Date: Sun, 8 Jul 2007 19:51:29 -0400; So then you are trying to convince us that anyone who has a 240V dryer, range, AC, Air Compressor or similar device with the neutral tied to the ground at the wall outlet and at the device has a safe; /archives//html/Amps/2007-07/msg00094.html (10,636 bytes)
20. Re: [Amps] Transformer question (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Sun, 8 Jul 2007 21:25:22 -0400; Hi Carl, It appears there may be some confusion about what a neutral and a ground are. A neutral is a lead sized to carry return currents to the mains box, and it is an insulated lead. In a consumer; /archives//html/Amps/2007-07/msg00096.html (12,538 bytes)

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