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Old 15th September 2012, 08:16 AM   #101
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Maybe for a Microphone !!

There is no data.

jer
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Old 15th September 2012, 11:40 AM   #102
el`Ol is offline el`Ol  Germany
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Yes, most likely no difference in primary/secondary winding thickness.
That this bigger one is for signal is unlikely, isn't it?
NF Audio Übertrager Transformer Multi Anschlüsse | eBay
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Old 15th September 2012, 08:09 PM   #103
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Yes, That one looks a little more suitable for experimentation as it has a larger size core.

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Old 16th September 2012, 12:17 PM   #104
el`Ol is offline el`Ol  Germany
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Thanks, I bought it.
If it doesn't have the right windings I have at least a nice core for winding myself.
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Old 15th April 2014, 09:09 PM   #105
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Alex, the balanced/unbalanced thing (balun) one turn transformer sounds interesting!
Could You explain a little further?

Are the cores (with primary windings) encapsulated in the 3/4 turn copper clad?
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Old 15th April 2014, 09:28 PM   #106
scholl is offline scholl  United States
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You may want to consider starting with a Jantzen toroidal crossover choke and add the secondary by hand. Add a few windings to figure out the turns ratio then the primary turns. figure out the ratio you want then add the right amount of secondary turns to finish it up.
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Old 22nd April 2014, 11:35 AM   #107
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Quote:
Originally Posted by alexberg View Post
Oh, well...
that's what you need.
Your stripe resistance is 3 milliOhms.
100W yeilds 180A RMS.
Stripe voltage 0.54
Using decent amorph core with 3 sm sq cross section
like stacked 2xM512/522/612 from magnetec
all you need is 35 turns of magnet wire 1.6 mm in dia.
Transformer needs to be balun-like,
see attach. with single turn secondary shown.
Two cores with wound primary stay inside secondary.
Can easily be done from copper pipes, copper sheet and some soldering
I've done some practical experiments with "one turn" transformers, inspired by alexberg . Very good bandwidth and low distortion. One funny thing happened though. When I measured my speakers with HolmImpulse, all of a sudden, the speaker returned a inverted pulse!
Once every 3:rd or 4:th measurement, the measured impulse was inverted, and you could also see the phenomenon on the phase curves.

Could this phenomenon be a result from when you make a transformer winding with one turn, where the ends of the turn doesn't meet, the one turn winding
cannot be called a clockwise or anti clockwise turn?

Have I invented a new kind of binary random generator?

It might be HolmImpulse pulling my leg, so I shall do some further experiments and measure the signal directly from the transformer...
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Old 6th July 2014, 03:51 AM   #108
ghemml is offline ghemml  Singapore
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Lots of information I got from this thread for building my own ribbon tweeter.

Just to share what I have done:

My custom build corrugator
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The mini nickel perm-alloy EI transformer I bought from ebay, can't recalled the ratio but its around Sec : 5 turns and Pri : 70turns
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Using Woofer Tester to make quick measurements
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Embedding of the ribbon tweeter
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Measurements
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Last edited by ghemml; 6th July 2014 at 03:54 AM.
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Old 6th July 2014, 03:52 PM   #109
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The magnet structure is really nice, but that transformer is not going to do it. I made some of those around 15 years ago, and results are bad. See my previous post on making one with sheet copper and ferrite cores which is almost lossless. Also the wire from transformer to ribbon must be short and very large, like # 8 stranded. Current for those is huge. Over 30 amps at medium volume. I have more photo's of how to do it if needed.
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Old 6th July 2014, 04:17 PM   #110
ghemml is offline ghemml  Singapore
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Noted on the loss, using the calculator online the efficiency is about 87%. I'm quite ok with my current transformer, since I still can get around 90dB to 93dB performance. My other objective was also to have nickel perm-alloy transformer and has to be small so I can hide it inside the yoke.

I got it from ebay

http://www.ebay.com/itm/230646735924...84.m1439.l2649
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