PIEZO NXT type panel - Page 57 - diyAudio
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Old 8th April 2011, 02:07 AM   #561
CLS is offline CLS  Taiwan
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Quote:
Originally Posted by LineArray View Post
...

nevertheless your
"standing pendulum" will have higher order
"bar modes"....

...
Yes, you're right. (and, what a perspective! )

In addition, it's very interesting to find the sticks are vibrating with the signal, while the excitors stay still, almost dead still by touching feel.

The 'pivot' of the stick at the bottom is also vibrating, but I can't make sure if this is the stick itself, or transmitted from the frame (indirectly from panel) -- the whole supporting frame is vibrating along the music and I haven't done anything to it, yet.


Quote:
Originally Posted by LineArray View Post
...

The panel is acting upon the spring predominantly,
which is given by the VC suspension of the exciter.
...
And this spring is connecting magnet of excitor and the panel on its both ends. I was thinking, should I add some more mass to the excitors? So I can have a bigger 'hammer', and then the panel would be kicked furthur away (larger excursion, higher SPL)

But the small excitors are dead still already! I don't get it.


Oh, this won't show up in any audio show. It's just a personal toy
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Old 19th April 2011, 04:51 AM   #562
CLS is offline CLS  Taiwan
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Quote:
Originally Posted by tylersphile View Post
....

When I get back in town, I will attempt to provide pictures (as the wood is quite beautiful).
....
Hi,

Any update?
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Old 20th November 2011, 02:23 PM   #563
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Hi fellas,
I was following this with great interest, a year and a half ago. My brother in law and I built a set of these and were disapointed with output level and crappy highs. I know there were a lot of ideas thrown around about fixing the highs, but we tried something simple that helped imensly. I have a pair of bose 901's, and tried the equalizer. What a difference! Still not great ,but a step forward. Again, this is not my profession so the tech talk is often above my head, but maybe this helps move this project forward.
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Old 30th January 2012, 07:23 PM   #564
jzagaja is offline jzagaja  Poland
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Anyone tried an accelereometer for finding optimum exciter placement?
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Old 31st January 2012, 02:43 AM   #565
pol_bct is offline pol_bct  Reunion
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Quote:
Originally Posted by jzagaja View Post
Anyone tried an accelereometer for finding optimum exciter placement?
Hi jzagaja,
the tip of finger is very sensitive to small movements
this is the way I found the 1/3-2/3 placement....

POL
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Old 31st January 2012, 05:46 PM   #566
jzagaja is offline jzagaja  Poland
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Even on high frequencies

Professional way (despite vibrometer and mic array) is:
Scan & Paint - Products - Microflown
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Old 31st January 2012, 06:50 PM   #567
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Quote:
Originally Posted by jzagaja View Post
Anyone tried an accelereometer for finding optimum exciter placement?
Hi,

the exciter actually is an accelerometer, by closer evaluation of the
impedance at a certain driving point ... more usable at lower
frequencies of course.

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Last edited by LineArray; 31st January 2012 at 06:57 PM.
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Old 31st March 2012, 09:21 PM   #568
stera66 is offline stera66  Serbia
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Did someone build exciter from scratch?
Where can I find plans for exciter motors?
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Old 31st March 2012, 09:58 PM   #569
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Default Emo Labs or Edge Motion Technology

I looked at the first thread. Its author excited the edge of a membrane with piezo drivers; to make a loudspeaker. There is an existing flat panel technology called Edge Motion by Emo Labs. Search Bing for Emolabs. Scroll down to the heading. Hear that; Boston... The U tube video shows the CEO or equivalent of Emo Labs demonstrating this new tech speaker.
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Old 2nd April 2012, 11:29 PM   #570
stera66 is offline stera66  Serbia
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Sorry I overlooked that the topic is about piezo exciters.
I'm more interested in Bertagni type of panels.
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