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| To: | <[email protected]> |
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| Subject: | LF: Re: OT - Two questions about toroids |
| From: | "James Moritz" <[email protected]> |
| Date: | Sun, 15 Jul 2012 11:51:06 +0100 |
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Dear Daniele, 1) I recovered two unknown toroids from a TV set which included a DVD player. Apparently they were used as common > mode chokes in the middle of multi-wire flat cables connected between the TV main board and the DVD player. Could > they be of some use in LF-MF circuits? Yes - typically EMC ferrites are fairly high permeability types that will work well in transformer applications at LF/MF. Some experimentation will be needed to determine how best to use them.... 2) More OT: I have some unused FT114-43 toroids. I wonder if they could be used as a substitute of T80-2 toroids in >small (QRP) HF antenna tuners that I'm planning to build for 14 MHz. No - 43-grade ferrite cores are not a substitute for the -2 grade iron dust material. The permeability of the iron dust material is much lower, and the losses when used as resonant inductors are much lower also. Cheers, Jim Moritz 73 de M0BMU |
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