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Old 10th July 2012, 09:15 PM   #31
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This question of transformerless ribbons pops up every several months. It's very interesting, but getting rid of the transformer and still staying with anything resembling more of a ribbon than magnetoplanar driver will require the special amplifier. In fact, just getting rid of the transformer only requires the amplifer and not any changes to the ribbon driver. For the sake of forward motion, might want to stick to practicality. On the other hand, any attempt to match an actual ribbon driver to an amplifier designed for an 8 ohm load without a transformer is going to wind up fairly sad.

Still, with all that remaining quite obvious for so long, nobody has enough faith in the end result being so far superior to something easier and more common, that they successfuly design the high frequency, good sounding, ultra-low impedance amp. Granted, it seems like it'd be a pain in the butt from every angle.
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Old 10th July 2012, 09:48 PM   #32
sreten is offline sreten  United Kingdom
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Hi,

There is one way of doing it. Imagine a large sheet of aluminium with
thin mylar on the back (and eventually front). Etch it so the "ribbon"
in the gap is multiple parallel conductors, then use the rest of the
sheet with far wider conductors to wire up the parallel conductors
in series. No real reason why it shouldn't be able to be made to
work, or least used to raise the impedance over a single ribbon.

rgds, sreten.
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Old 11th July 2012, 02:04 AM   #33
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sreten, isn't this what is commonly done with "leaf ribbon tweeters"??

Or, all of the "printed ribbon" type drivers, including things like Apogee bass and mids, and all sorts of pro HF drivers including the old Stage Accompany...?

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Old 11th July 2012, 04:10 PM   #34
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Yes bear, i think you are almost right.

Apogee uses Kapton, not Mylar like others do.
Some of their MR/TW ribs are pure ribbons.

Today their *leafs* or *printed ribs* are CNC-Precision-machined, in the beginning handcut, later etched.

And the returns are wires or flat wide aluminiumtraces, installed with different techniques.
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Old 11th July 2012, 06:17 PM   #35
a.wayne is offline a.wayne  United States
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All Apps use Ribbon drivers, only their Bass drivers were planer magnetic ...
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Old 11th July 2012, 06:25 PM   #36
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by bear View Post
sreten, isn't this what is commonly done with "leaf ribbon tweeters"??

_-_-bear
Hi,

I imagine so. Never actually seen one done like that in a single gap.

rgds, sreten.
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Old 12th July 2012, 04:43 PM   #37
WrineX is offline WrineX  Netherlands
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well you have to get the returns somwhere. so either the ribbon has multiple connections that are fed back into the bottom of the ribbon, wwith wire or with a loop.

i you can create a ribbon in a loop thats shifts one trace where they are connected ur done.


kindo of a nice idea , but hard dto make

Last edited by WrineX; 12th July 2012 at 04:45 PM.
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Old 12th July 2012, 07:06 PM   #38
a.wayne is offline a.wayne  United States
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Has to be with loop ( multiple traces ) transformer or with resistor if direct drive. My personal preference is direct drive resistor , then transformer , with loop being last of the three ..
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Old 12th July 2012, 08:40 PM   #39
WrineX is offline WrineX  Netherlands
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resistor may be easy but i gues highest losses , transformer has less losses i gues, followed last by by the loop, caus all material is used in driving the ribbon. not just being resistance.


could be wrong here ..
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Old 12th July 2012, 11:34 PM   #40
a.wayne is offline a.wayne  United States
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Correct, but for Sonics .........
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