- Posted by mqracing (M) on January 13, 2007 at 08:34:56
In Reply to: Cap? What cap? posted by gluca on January 12, 2007 at 14:55:11:
Hi Gianluca:Great stuff. And thanks for sharing your circuits with us.
See if you know or not.... for the L's listed--- do you have
max dcr's (winding resistances)? I've kicked around winding
some specialty (that are applications supported) aircore inductors.
Most of the sizes (on first blush) look like they could be wound
as aircore guys.I spoke to Paul Joppa last night and we briefly discussed these L's.
Paul has done some modeling (using a spreadsheet) to design some aircore L's. Paul mentioned an article (or he said it could have been a letter) that was printed in an old AES journal by Nevil Theil on winding air core L's. Anyone seen this article\letter? From memory PJ said it offered some insights and rules of thumb... like the OD should be two times the ID and that the wire cross section should be square for best results.the 600 ohm to 600 ohm tranneys... we have tons of really good designs (from mild to wild) in our archives... biggest hassle (and most prominent expense in building) is the mu metal cans that these often go in... sometimes a design will use 3 mu metal cans with two copper shading rings interspersed.
but neat stuff... and always welcomed on our board.
MSL
Follow Ups:
- Reference for crossover coils - Paul Joppa 15:28:21 01/14/07
(0)
- In Reply to: passive crossover posted by mqracing on January 13, 2007 at 08:34:56:
Thiele, A. N., "Air-Cored Inductors for Audio",
Originally Proceeding of the I.R.E.E. (Australia), v.36, pp.329-333
Reprinted by permission in J.A.E.S., v.24, n.5 (June, 1976), pp. 374-378.
Hope that helps!
- Answers part #1 - gluca 12:23:40 01/13/07
(0)
- In Reply to: passive crossover posted by mqracing on January 13, 2007 at 08:34:56:
Ciao Mike! Thanks!
those inductors you see in the filter are made by Cinemag as a replacement for old Pultec equipment: its model CML150T and they are multitapped ... that will allow me to have more freqs to select in the same equipment. The DCR ranges from 22.3R down to a few ohm. They are very small (you can old 4-5 of them in your hand). They are wound on a ferrite core (dunno exactly what the material is).
Anyway I found this link if you missed it. Probably the matter is well known but if someone out ther would like to try to wind his own L ...
http://www.fnrf.science.cmu.ac.th/theory/magnets/index.html
go to producing wound components"
The 600:600 I am using are also wound by Cinemag. CMOQ2 Hi with an hi.nickel core but they do not come with a mu.metal can. I have also tried some old altec trannies but CMOQ sounded best. I have seen an old pic from an UTC catalog illustrating the can ... man ... what a tecnology. I misplaced it but they used to have more layers of copper and mumetal! Great!OH! This is the first run of the low pass filter. It still need some tweking as I want to cut off at 450, 600, 800, 1000 and 1200Hz.
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