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Old 22nd February 2013, 07:28 PM   #35741
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Quote:
Originally Posted by Kindhornman View Post
Are there fuses made of this material?
Never seen. I just remember an amp, using a flat bridge of Constantan, directly welded on the board at the collector of the power devices.
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Old 22nd February 2013, 07:33 PM   #35742
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Originally Posted by Kindhornman View Post
Christophe,
Are there fuses made of this material? Constantan or Manganin.
I´m not aware of fuses that use Constantan or Manganin, but both
are used for precision power resistors. Example of a manufacturer:

Precision and power resistors - Isabellenhütte Heusler

I´m going to try them in a speaker crossover some time.
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Old 22nd February 2013, 07:37 PM   #35743
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Georg,

check out Zeranin (isabellenhuette also)
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Old 22nd February 2013, 07:46 PM   #35744
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Thanks for the hint. But this comes only in the form of wire, no ?
I was thinking about those:
http://www.isabellenhuette.de/filead...taende/PBH.PDF
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Old 22nd February 2013, 07:48 PM   #35745
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This is not True
Indeed Myrrhleine, being wrong all the time is not at all the same as being wrong always.
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Old 22nd February 2013, 07:52 PM   #35746
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Originally Posted by jacco vermeulen View Post
Or read the sales brochure : TESLA Series Technologies | Synergistic Research

(doesn't say if frequent flyer miles are included)
I prefer the pictures, 2MV is about 24" in air and in any case they are just grounding the sparks through some cables (it appears). Quantum tunneling indeed.
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Old 22nd February 2013, 08:04 PM   #35747
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Christophe,
So the question then would be in a fuse link application how you would size the link of one of those materials so that it would fail at the required current draw? It actually sounds like it could be a practical application if a buss type fuse was developed with a material with a constant resistive value. But I didn't do the math that I saw below with the value to the -5 exponent so perhaps again just more than overkill in an audio circuit.
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Old 22nd February 2013, 08:07 PM   #35748
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gk7,
Thank you for that link. I should have looked there before I asked my question.
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Old 22nd February 2013, 08:31 PM   #35749
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Originally Posted by Kindhornman View Post
So the question then would be in a fuse link application how you would size the link of one of those materials so that it would fail at the required current draw?
I believe the simplest way would be to try various wire diameters with constant current sources ?
This said, i do not like fuses on power rails, it is better to use an active protection circuit. Faster, self rearming if you want and more efficient to protect against more defects or dangers and less negative effects on the sound. John will be happy to use silver or gold plated relays. For once, it will make sens.
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Old 22nd February 2013, 08:48 PM   #35750
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Originally Posted by gk7 View Post
only in the form of wire ?
Isabellenhuette uses Zeranin foil in their ISA-PLAN resistor range.
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