> Hi:
>
> Still working on the Precision Clock.  To use a piezo disk, like the
> Electronic Goldmine G9303 or G14378, that has 3 terminals and requires a
> few external components to make the oscillator it needs to be mounted.
> But if you just hold it using two fingers the noise is stopped.  So can
> it be mounted using 3 straight #28 wires that go from the pads on the
> piezo straight down to holes in the PCB?  Of course there would be maybe
> 1/4" air gap between the piezo disk and the PCB.  How about using a
> single spot of hot melt glue on the center of the backing plate?

The murata pdfs mentioned are a good place to start to get the
mounting style down and the resonance chamber if you need it to
be really loud.

For piezo disks, I edge mount them using common silicon caulk.
Epoxy, superglue, and plastic model cement have always broken
loose on me - my guess is that the vibrations cause the "harder"
glues to crack.

For connecting the wires to the piezo I use electrical silver
epoxy. If you just need a little bit of it, they make glue
pens of the stuff for about $10 (US) and as I much as I hate
to admit that I know this, Radio Shack carries the little pens.

If you want to attach the wires using solder, pre-tin the wire
tips with a lot of solder and solder it fast - piezo's don't like
soldering irons very much.


-- 
Cris Wilson
Information Resource Consultant
College of Architecture, Arts, and Humanities
Clemson University
cris@clemson.edu
Report problems to: aah_computers@clemson.edu


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