On Tue, Mar 30, 2004 at 11:19:19AM -0800, Matthias Weingart enlightened
us thusly
> On Tue, Mar 30, 2004 at 01:39:20AM -0800, Declan Moriarty wrote:
>
> > I am drawn to the stripe on the top, which is a polarity mark? In
> > the photo http://www.boerde.de/~matthias/cd/dsc03777a.jpg there
> > appears to be a couple of them. How many are on the board?
>
> 3 parts are on the board. And one is soldered upwards! The stripe on
> top is made from the same metal as the contacts, but does not seem to
> be connected to the other ones.
>
> > I am inclined to think it's not a simple 0.5nF capacitor, but some
> > sort of polarised device. Options would be diodes, supression etc.
> > Are you sure that's all that's connected to the opamp (4 layer pcbs
> > and all that)?
>
> Yes it is a 4 layer board, but does not have any planes - I can look
> through all 4 layers (behind a strong lamp) and I see the wires in the
> inner layers too. I have connected my osci to that part and when I
> knock on it I get a AC-voltage across the part. Looks like a shock
> sensor.
That's a quality of piezo type materials - resonator?
--
With best Regards,
Declan Moriarty.
--
Author: Declan Moriarty
INET: [EMAIL PROTECTED]
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