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Old 29th November 2012, 12:07 PM   #21
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Henry,

I was talking about the DIAPHRAGM.

The frames with the magnets might well bend with gravity too.
But IF you are putting these horizonatally (are you??) then the diaphragm will hang down. Dipping lowest in the center.

Ok?

What are you using for the conductive material and the substrate??

Looks like a good project so far.

_-_-bear
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Old 29th November 2012, 12:36 PM   #22
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3 mm Aluminium tape and 12 um Mylar c. Both the small diaphragms weigh 8 grams.We will see how good it is when I play some sole piano music thro' it!?? Keep your fingers crossed.
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Old 29th November 2012, 01:09 PM   #23
tyu is offline tyu  United States
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James.........thanks for ALL your Time & work on the Ribbons drivers...an posting pic...Good Job...
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Old 30th November 2012, 03:29 PM   #24
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Just finished wiring it up wants legs on, then got to finalize shape. Will give it a listen tomorrow, see or should I say hear what it's like. Had enough today. Some more pics to sort out.
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Old 1st December 2012, 10:34 AM   #25
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Default LAST FEW PICTURES, NEARLY FINISHED!!

Here are the last few pictures, before I listen to , fingers crossed.!!Last one shows 9volt battery used for checking phase of each diaphragm.
Attached Images
File Type: jpg SAM_0471.JPG (461.0 KB, 146 views)
File Type: jpg SAM_0472.JPG (450.1 KB, 141 views)
File Type: jpg SAM_0473.JPG (460.6 KB, 131 views)
File Type: jpg SAM_0474.JPG (470.1 KB, 127 views)
File Type: jpg SAM_0475.JPG (446.8 KB, 118 views)
File Type: jpg SAM_0476.JPG (454.0 KB, 29 views)
File Type: jpg SAM_0477.JPG (539.5 KB, 33 views)
File Type: jpg SAM_0478.JPG (448.6 KB, 36 views)
File Type: jpg SAM_0479.JPG (434.9 KB, 39 views)
File Type: jpg SAM_0480.JPG (391.6 KB, 42 views)
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Old 1st December 2012, 10:49 AM   #26
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Got to sort out 3 pair cables, then plug into wall sockets left of fireplace Then find a good piano CD if I can remember where I put them!? Or I may use an LP. Trouble is I moved them but where to, can hardly move with all the 24 speakers in my living room, about 20 Amps and 400 LP's + about 45 reel to reel tapes.And the 15 shelves jam packed with stuff, it'a good job I live on my own.
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Old 2nd December 2012, 09:26 AM   #27
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So many settings on my Amp for this and that it is almost impossible to come to any conclusion about the sound of the mini baby grand. A press of a button on the remote changes everything, time after time. Driving me crazy.
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Old 2nd December 2012, 01:28 PM   #28
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You ought to get a decent low end out of that thing !!!

What is the total surface area?

jer
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Old 2nd December 2012, 03:17 PM   #29
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468 sq inches the actual diaphragm area.
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Old 8th December 2012, 07:47 AM   #30
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Thanks Henry !!!

The look much bigger than that !!

Here is a simulation based just upon the surface area and an Xmax of 2mm.
I just doubled the border width to the diaphragm as I don't know the exact dimensions.
I looks pretty good !!!

Cheers !!

jer
Attached Images
File Type: jpg PIANO.jpg (116.7 KB, 36 views)

Last edited by geraldfryjr; 8th December 2012 at 08:00 AM.
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