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Old 17th April 2009, 05:56 AM   #41
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This thread has become so corrupted i am abandoning it. It will need to be reopened as a new thread where people might feel more free to express their opinions on this device.


Dave why not reopen the thread under your name and give your findings under any title you wish be they positive or negative, as least perhaps we might get some feedback on it.
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Old 23rd November 2009, 06:21 AM   #42
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by popular demand on my private message board, i made some measurements on the Piezobee

capacitance is 30pf
resistance 0.1ohm
Inductance .001H
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Old 8th October 2010, 02:38 PM   #43
gpapag is offline gpapag  Greece
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Default Here is one more witch to burn (*PS)

Hi all

Bulk Acoustic Wave (BAW) filter came to my mind as a possible explanation to audiojoy’s piezoelectric disk. I have not yet read of any One Port BAW though. But considering the many and complicated factors that make –up the way that BAW filters work, it may be possible that sort of such a device may have been in effect by using a piezoelectric disk the way audiojoy has wired it.

*PS: I read this thread today. I haven’t seen the deleted posts, therefore I can not comment.
What I can say is that audiojoy has made clear that he doesn’t know the source of the effect he has noticed using the piezoelectric disk.
He was also very well mannered in his response to the accusation of introducing Hopus Pocus (i.e. magic)in this site.
He at least doesn’t sell a device of which the principles of operation are -in part or fully- unknown.
His only misstep as I see it, is that he related his finding in an unsupported by factual data way to the functioning of a commercial device (Bybee).

I would be glad if I had done in the past only this sort of mistake myself!

I am in complete agreement with audiojoy in post #37 Piezobee -a very simple and cheap power filter and I would like to read a clear response to this post#37

Regards
George
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Old 8th October 2010, 05:24 PM   #44
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I am pleasantly surprised by recent comments on my old threads.

Thank you for your support and perhaps some well needed encouragement after the battering i recently got on my last thread.
It almost brings a tear to my eyes
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Old 9th October 2010, 08:20 AM   #45
marce is offline marce  United Kingdom
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Proadlizer™ WR Series PTM

For your info and interest.
Any added capacitance would have some filtering effect, I would look at these piezos and wether the capaitance or inductance changes with frequency.
Have fun.
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Old 9th October 2010, 04:59 PM   #46
DaveM is offline DaveM  United States
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Very interesting product. Unfortunately it is only available with a 2.5V rating. Not much use for any of the projects I have seen going on around here. Bummer.
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