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Total 15 documents matching your query.

1. [Amps] 'red' cores versus 43 cores (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 28 Mar 2009 17:00:41 -0700; Is there a straightforward practical or operational description of the difference between 'red' cores and 43 material. The magnetic differences are large. However, the 'red' cores are used in low pow; /archives//html/Amps/2009-03/msg00518.html (7,651 bytes)
2. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 28 Mar 2009 17:10:59 -0700; I don't know what a "red core" is, but I know a lot about the Fair-Rite frequencies. I would NOT use it where the core needed to carry much power above a few MHz. How much is "much?" A 2.4-inch #43 i; /archives//html/Amps/2009-03/msg00519.html (7,864 bytes)
3. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: Larry Benko <xxw0qe@comcast.net>; Date: Sat, 28 Mar 2009 18:20:25 -0600; I'm pretty sure the "red" cores are type 2 powdered iron cores having a permeability of 10. Actually the cores are usually red on all sides but one which is brown. Larry, W0QE _______________________; /archives//html/Amps/2009-03/msg00520.html (8,552 bytes)
4. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sat, 28 Mar 2009 20:33:52 -0400; What are you trying to do as it relates to amplifiers? Lets start with something simple instead of trying to cover A-Z in one breath. Powdered iron 2 Mix Micrometal red cores have been used for decad; /archives//html/Amps/2009-03/msg00521.html (8,300 bytes)
5. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: Dan Sawyer <dansawyer@earthlink.net>; Date: Sat, 28 Mar 2009 19:27:02 -0700; Thanks to all of you for the replies. The first interest is to build and test a 300 watt input and output transformer pair. The reason I chose #43 to discuss was it was mentioned in at least one of t; /archives//html/Amps/2009-03/msg00522.html (7,951 bytes)
6. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: "Alex Eban" <alexeban@gmail.com>; Date: Sun, 29 Mar 2009 09:00:27 +0300; What you need is a material with an initial permeability of about 125. Forget about color codes, they pertain only to Micrometals cores! You need a material similar to the 4C6 from Philips, now Epcos; /archives//html/Amps/2009-03/msg00524.html (9,606 bytes)
7. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: "Rex Lint" <rex@lint.mv.com>; Date: Sun, 29 Mar 2009 08:36:20 -0400; not flux coupled transformers, so that >the core's main function is to increase the inductance of the cores at low frequencies, not transfer energy. ?? Do you mean "increase the inductance of the tr; /archives//html/Amps/2009-03/msg00525.html (10,823 bytes)
8. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Sun, 29 Mar 2009 09:15:08 -0400; You are providing almost no information. What do you mean by a 300W input and output pair? Is the power level the same for both? I see below that you referenced a Moto app notes so we finally find ou; /archives//html/Amps/2009-03/msg00526.html (9,874 bytes)
9. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: "Alex" <alexeban@gmail.com>; Date: Sun, 29 Mar 2009 17:43:55 +0200; Hi guys: I would like to point out a few things 1) The color coded cores pertain specifically to Micrometals. They are intended for inductors, not transformers and the color code indicates for what f; /archives//html/Amps/2009-03/msg00527.html (11,604 bytes)
10. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: Larry Phipps <larry@telepostinc.com>; Date: Sun, 29 Mar 2009 13:01:35 -0400; Red (-2) material is powdered iron, -43 is a ferrite. Generally speaking, ferrites should only be used for transformers, because they are very lossy when used as an inductor. Powdered iron can be use; /archives//html/Amps/2009-03/msg00530.html (9,199 bytes)
11. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 29 Mar 2009 10:41:12 -0700; WRONG! When a conductor is wound around (or passed through) a ferrite material, nearly all of the magnetic flux resulting from current in the conductor flows in the ferrite core. Any loss in the core; /archives//html/Amps/2009-03/msg00531.html (11,948 bytes)
12. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: Manfred Mornhinweg <mmornhin@gmx.net>; Date: Mon, 30 Mar 2009 01:33:27 +0000; Hi Dan, and all, I will try...! The "red" material is powdered iron with a permeability of 10, while the 43 material is ferrite with a permeability of 850. The two behave quite differently, not only; /archives//html/Amps/2009-03/msg00533.html (15,484 bytes)
13. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: "Alex Eban" <alexeban@gmail.com>; Date: Mon, 30 Mar 2009 13:50:43 +0300; Hi Jim and all: Like I said in the 1st paragraph, most high power HF transformers ARE wound on ferrite cores. they employ transmission line based windings in which the energy is coupled to the second; /archives//html/Amps/2009-03/msg00535.html (14,385 bytes)
14. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: "Alex Eban" <alexeban@gmail.com>; Date: Mon, 30 Mar 2009 14:04:21 +0300; Thanks Manfred, this really sums it up very well! 73 and all the best; Alex 4Z5KS Hi Dan, and all, I will try...! The "red" material is powdered iron with a permeability of 10, while the 43 material; /archives//html/Amps/2009-03/msg00536.html (16,483 bytes)
15. Re: [Amps] 'red' cores versus 43 cores (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 30 Mar 2009 10:14:43 -0700; Not unless it is driven as coax (that is, with a center conductor). Coax is a special form of transmission line, in that it has zero leakage flux. ALL of the differential flux is contained within the; /archives//html/Amps/2009-03/msg00537.html (10,479 bytes)

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