RE: Solid State

To: "tesla-at-pupman-dot-com" <tesla-at-pupman-dot-com>
Subject: RE: Solid State
From: Pike Green <PikeGreen-at-multipro-dot-com>
Date: Wed, 15 May 1996 02:20:21 -0500
Cc: "100624.504-at-CompuServe.COM" <100624.504-at-CompuServe.COM>
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Alan,

-----
| From: Tesla List
| To: Tesla-list-subscribers-at-poodle.pupman-dot-com
| Subject: Re: Solid State
| Date: Tuesday, May 14, 1996 10:55 PM
| 
| >From 100624.504-at-CompuServe.COM Tue May 14 21:45:44 1996
| >Date: 14 May 96 18:47:19 EDT
| >From: Alan Sharp <100624.504-at-CompuServe.COM>
| >To: Tesla List <tesla-at-poodle.pupman-dot-com>
| >Subject: Re: Solid State 
| ...
| A surplus store is selling lots of small toriodal
| cores - no information on the core materials
| only that some are red, or blue or natural -
| is there a colour code for these things?
| ...
-----

Here is some information that may be useful. The tables below are 
excerpted from the FCIM Information Server at  
     < http://fcim.csdc-dot-com/ >

The tables themselves are at
     < http://fcim.csdc-dot-com/compid/ind/toroid.html >

These color codes are strictly valid only for cores manufactured 
by Micrometals or Amidon. Some other manufacturers use the same 
colors, but not consistently.

Properties of Micrometals Iron Powder Cores
-------------------------------------------------------
Mix  Color         Material          Mu  Frequency(MHz)   
---  ------------  ----------------  --  --------------
 26  Yellow/White  ???               75  dc   - 1    
  3  Gray          Carbonyl HP       35  0.05 - 0.50
 25  Red/White     Carbonyl GS6      25  0.10 - 2
  1  Blue          Carbonyl C        20  0.50 - 5
  2  Red           Carbonyl E        10  2    - 30
  7  White         Carbonyl TH        9  3    - 35
  6  Yellow        Carbonyl SF        8  10   - 50
 10  Black         Powdered iron W    6  30   - 100
 12  Green/White   Synthetic oxide    4  50   - 200
 17  Blue/Yellow   Carbonyl           4  40   - 180
  0  Tan           Phenolic           1  100  - 300

Properties of Amidon Iron Powder Cores
--------------------------------------------------------------
                                 Typical          Optimal
Mix         Color         Mu  Frequency Range  Frequency Range
----------  ------------  --  ---------------  ---------------
41' HA'    Green          75   10k - 100k       20k -  50k
 3' HP'    Gray           35   20k -   2M       50k - 500k
15' GS6'   Red/White      25   20k -   5M      500k -   1M
 1' C'     Blue           20   40k -   5M        1M -   2M
 2' E'     Red            10  200k -  30M        2M -  10M
 6' SF'    Yellow          8    2M -  50M       10M -  20M
10' W'     Black           6    4M - 100M       20M -  40M
12' lrn-8' Green/White     3   10M - 200M       40M -  90M
 0' Ph'    Tan             1   50M - 300M       90M - 150M

(Tables Courtesy Amidon Association and Micrometals)

The attached file, < toroid.htm > has more information on
Powdered-Iron Toriod Cores as well as information on Ferrite 
Toriod Cores.

The FCIM Information Server has lots of data on various components 
as well as links to manufacturers and other data repository sites. 
You might want to have a look sometime.

Regards,
Pike
---
Pike Green, Research Engineer        PikeGreen-at-multipro-dot-com
Electrical and Computer Engineering  rpg4322-at-tntech.edu
Tennessee Tech University, Box 5004  Voice: +1 615 372 3718
Cookeville TN 38505 USA              FAX:   +1 615 372 3436
---

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