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Old 5th October 2008, 03:12 PM   #1
bigwill is offline bigwill  United Kingdom
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Question Mains toroid as MC step up?

Toroids seem to have a nice wide bandwidth, even bigger ones. How well would a little mains toroid fare as an MC Step up transformer?
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Old 6th October 2008, 12:25 AM   #2
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It would be interesting to try out, but the only thing is that you are dealing with tiny signals. Try it and see I suppose. Maybe a 6V sec and 230 pri would give enough of boost for a MC cart. Probably as low a VA as possible to keep the wires fine.


Something tells me though that the method of winding etc would be important here.

Fran
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Old 6th October 2008, 03:51 PM   #3
h_a is offline h_a  Europe
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Quote:
Toroids seem to have a nice wide bandwidth
Yes, but I guess it ain't flat.

Also you will want a certain (resistive) loading for your MC-cart and the usual secondaries would be too low.

Have fun, Hannes
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Old 6th October 2008, 03:51 PM   #4
bigwill is offline bigwill  United Kingdom
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Quote:
Originally posted by woodturner-fran
It would be interesting to try out, but the only thing is that you are dealing with tiny signals. Try it and see I suppose. Maybe a 6V sec and 230 pri would give enough of boost for a MC cart. Probably as low a VA as possible to keep the wires fine.


Something tells me though that the method of winding etc would be important here.

Fran

I'm a novice at these things but my intuition tells me similar. I think that they would be best encased in a steel box for magnetic shielding.
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Old 6th October 2008, 08:41 PM   #5
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toroidal + case+4rca better denon stepup for 100 with ofc wire....
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Old 6th October 2008, 09:21 PM   #6
bigwill is offline bigwill  United Kingdom
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Quote:
Originally posted by nicoch46
toroidal + case+4rca better denon stepup for 100 with ofc wire....

Hopefully
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Old 6th October 2008, 10:09 PM   #7
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not much diy,,,


better Salas jfet ,diy....
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Old 7th October 2008, 04:04 PM   #8
kevinkr is offline kevinkr  United States
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Given the amount of magnetization current required by even the smallest power toroids I would expect pretty unsatisfactory results compared to a purpose designed mc step up transformer. It might be worth trying if you have 0$ invested in it as an experiment, but don't go out and buy anything expecting stellar results. Some relatively inexpensive surplus microphone transformers from Jensen, Altec, Cinemag or UTC will provide relatively good results for a small outlay compared to a name brand packaged mc transformer.. Quite popular approach currently here and in Japan..
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Old 7th October 2008, 08:18 PM   #9
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Indeed Kevin,

The usual silicon steel used in power transformers has a very non-linear magnetisation curve at lo levels.

In good step up transformers and mic/line transformers the core is made from an optimal mix of special soft steel and mu-metal to minimise non-linearity and for wide dynamics.

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