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Total 79 documents matching your query.

1. [Amps] Mail (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Sun, 05 Jun 2005 18:41:44 -0500
Hello All, Sorry to write this but I'm having a heck of a time with my ISP and my mail. I haven't been able to post to the list now for a few days until finally I had to use this account. I'm pretty
/archives//html/Amps/2005-06/msg00037.html (7,180 bytes)

2. Re: [Amps] questions on my tranformer test (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Mon, 13 Jun 2005 23:03:41 -0500
Ken, the watt rating can be determined by the core size and then the current found from that. But, that dont hold true if they didn't wind the coil with the right size wire for its duty cycle. The on
/archives//html/Amps/2005-06/msg00090.html (9,536 bytes)

3. Re: [Amps] questions on my tranformer test (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Mon, 13 Jun 2005 23:16:51 -0500
William, That's about all you can do besides measuring the internal coil twmperature which is read in the center of each winding. Then make sure that temp is at least 2X less than the wires maximum r
/archives//html/Amps/2005-06/msg00091.html (11,090 bytes)

4. [Amps] ESI 251 LCR Meter (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Mon, 13 Jun 2005 23:31:31 -0500
All, I added another LCR meter to my shop and found it to be one of the best I've used. I acquired an ESI (Electro Scientific Industries) model 251 digital LCR meter and just tried it out. This one u
/archives//html/Amps/2005-06/msg00092.html (7,416 bytes)

5. Re: [Amps] questions on my tranformer test (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Tue, 14 Jun 2005 02:30:15 -0500
William, Yes there is a long drawn out formula to figure temperature rise and the appromimate temperature it will run at. The problem is it isn't real exact as the construction has a lot to do with i
/archives//html/Amps/2005-06/msg00095.html (12,874 bytes)

6. Re: [Amps] HV transformer test tspa (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Wed, 15 Jun 2005 13:08:11 -0500
John and others, You have to remember though that a potted transformer will run hotter internally than one which is of standard construction. It works the same as adding insulation around the oven in
/archives//html/Amps/2005-06/msg00100.html (37,791 bytes)

7. [Amps] Heathkit Manuals (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Wed, 15 Jun 2005 13:50:44 -0500
All, I ran across a good site with a bunch of full Heathkit manuals hosted by Richard Pestinger KC8RP. For any interested in these, the link is below. Look down the page for a link titled "Heathkit M
/archives//html/Amps/2005-06/msg00101.html (6,606 bytes)

8. Re: [Amps] Alpha to Omega (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Thu, 16 Jun 2005 09:02:26 -0500
AMEN! What I do with tubing is use a piece of steel wool to bring it bright, taking off the oxidation. Then spray it thouroughly with a couple of coats of polyurathane varnish. This essentially maki
/archives//html/Amps/2005-06/msg00124.html (8,249 bytes)

9. Re: [Amps] RE : copper or silver in tank circuit? (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Fri, 17 Jun 2005 12:30:52 -0500
Bill, That's all I could think it would be used for, where the skin effect increases with frequency. I'll about bet that military stuff wasn't plated very thick either, maybe 1-2 mils at the most. Th
/archives//html/Amps/2005-06/msg00134.html (11,619 bytes)

10. Re: [Amps] Magnetic shielding (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Sun, 19 Jun 2005 10:04:37 -0500
Borislav, I dont think coupling to the chassis is what is causing this to happen. Microwave oven transformers use pretty cheap steel, and they most likely should be ran around 12 kilogauss. Actually,
/archives//html/Amps/2005-06/msg00146.html (11,152 bytes)

11. Re: [Amps] Magnetic shielding-Correction (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Sun, 19 Jun 2005 10:58:11 -0500
The form factor "F" below is 1.11 not 4.44. I was thinking of it multiplied by 4 but the 25.8 takes this into account for converting to inches. 4 X 6.45 (conv. factor) is 25.8. Actually this could al
/archives//html/Amps/2005-06/msg00150.html (12,548 bytes)

12. Re: [Amps] Magnetic shielding 2 (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Sun, 19 Jun 2005 11:53:21 -0500
Borislav, The form factor "F" below is 1.11 not 4.44. I was thinking of it multiplied by 4 but the 25.8 takes this into account for converting to inches. 4 X 6.45 (conv. factor) is 25.8. Actually thi
/archives//html/Amps/2005-06/msg00153.html (12,631 bytes)

13. [Amps] Leader LCR-740 (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Sun, 19 Jun 2005 12:57:43 -0500
I ran across this LCR meter the other day and figured somebody on here might be interested in it. It's a Leader LCR-740 analog type. I have one of these and it is pretty accurate. Also, you can use a
/archives//html/Amps/2005-06/msg00154.html (7,153 bytes)

14. Re: [Amps] Magnetic shielding 2 (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Sun, 19 Jun 2005 22:39:06 -0500
Borislav, 19 kilogauss is too high for M-6 or Hipersil material for about 28 or 29 gauge. It's max is about 17 kg., and it's recommended to be ran at 15 kg. because after 15 kg., the magnetizing curr
/archives//html/Amps/2005-06/msg00158.html (10,881 bytes)

15. Re: [Amps] Magnetic shielding 2 (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Mon, 20 Jun 2005 11:20:08 -0500
Borislav, The current drawn by the circuit shouldn't be any more than maybe 5% higher on the transformer side than what's on the supply side at the filter capacitor. Transformers are figured by power
/archives//html/Amps/2005-06/msg00163.html (14,125 bytes)

16. Re: [Amps] Magnetic shielding 2 Correction (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Mon, 20 Jun 2005 13:47:22 -0500
Borislav, "Then the primary current is the secondary current plus the losses". That should have said power and not current or; Then the primary power is the secondary power plus the losses. Sorry abo
/archives//html/Amps/2005-06/msg00166.html (15,223 bytes)

17. Re: [Amps] Magnetic shielding 2 flux density (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Mon, 20 Jun 2005 14:19:16 -0500
Borislav, You also mentioned using 12 kilogauss might be to small and the wire takes up the entire core. That very well could be and welcome to the world of transformer design. Even though the math i
/archives//html/Amps/2005-06/msg00167.html (7,641 bytes)

18. Re: [Amps] Cheap network analyser on eBay (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Fri, 24 Jun 2005 18:57:13 -0500
I'd buy that myself if it works but I overspent this month. I would however want to see some pics of it powered up before I bought it. I hardly ever buy or bid on equipment if there not under power w
/archives//html/Amps/2005-06/msg00220.html (10,274 bytes)

19. Re: [Amps] HV Switch Mode Power Supplies (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Fri, 24 Jun 2005 19:42:55 -0500
David, I was going for 1000 V, and was thinking 1 kV so must have added it and didn't catch it. The graph on the website showed a 1000 V drop over the range of 0-1 ampere. About every power supply I'
/archives//html/Amps/2005-06/msg00222.html (12,317 bytes)

20. Re: [Amps] HV Switch Mode Power Supplies (score: 1)
Author: "Will Matney" <craxd@engineer.com>
Date: Sat, 25 Jun 2005 15:34:17 -0500
Rich, See below; Yes, they should have, the same as any voltage regulator. I took a look at the graph the builder had posted on their website and quoted the figures from what I seen (1000 Vdc drop ov
/archives//html/Amps/2005-06/msg00235.html (15,267 bytes)

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