The url was in one of my previous posts
http://www.thedigitalshop.net/techdocs/piezo.pdf
and here is another one with the same kind of story to tell
http://www.scottwestern.com/pdf/page8.pdf
I'm not sure if this is actually true , just some info I have dug up.

Murata is an important player in piezo and ceramics.

Peter.

----- Original Message -----
From: "David VanHorn" <dvanhorn@CEDAR.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, June 17, 2004 9:22 PM
Subject: Re: [EE]: Piezo buzzer question, how to connect it


> At 05:21 PM 6/17/2004 -0400, Peter van Hoof wrote:
>
> >quote:
> >
> >DC Precautions
> >
> >In order to prevent depolarization of the ceramic elements it is
necessary
> >that every precaution be taken to prevent them from being subjected to
> >direct current. murata recommends the use of appropriate blocking
capacitors
> >for this purpose.
>
> Got a URL?
>
> I've never seen this, nor even a hint of it, till today.
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.
>

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.