In a message dated 2006/07/26, gmvoeth@........... writes:

> has the tenacity to find the necessary raw materials

Hi there,

       See http://www.jclahr.com/science/psn/chapman/piezo/PiezoSensAmp.jpg
       Not too difficult, more a question of knowing what to look for and=20
where to find it.

Materials

Double sided 1/16" thick glass circuit board 2" wide x 3.5" long - most=20
Electronic's suppliers

Spacers 30 mm long x 3 mm tapped Farnell No 473-6047 Squires No 600-950
threaded standoff 1818K-ND 1.25" + 6-32 bolts + a couple of washers from=20
http://dkc3.digikey.com/PDF/T053/1454-1457.pdf=20

Bolts Brass 10 mm long x 3 mm dia Pan head // 6-32 x 3/8" US Home Depot /=20
Lowes
        Brass 10 mm long  x 4 mm dia Pan head // 8-32 x 3/8" US Home Depot /=
=20
Lowes

Brass foil 5 thou from K&S=20

Brass 1/4" x 1/8" rectangular tube x 1.7" from K&S=20

Brass bar 1/2" OD x 1.85" =3D 4.7 cm for 50 gm

Adhesive Holdtite ST3295 two part acrylic adhesive Squires There are several=
=20
suppliers of similar products in the USA

Piezo disk 44 mm OD central sensor 25 mm OD Capacity 40 nF min typical 65 nF
Farnell No 500-3301 No 9843744,=20
Digikey 1N3595 diodes and PZT disks  p1421 for piezo elements - 102-1170-ND=20
44mm OD, 70 nF at $1.62=20
www.mouser.com 1N3595 diodes and PZT disks p1270 for piezo elements=20
665-KBI-4406 44mm OD, 70nF at $1.69 665-APS-100 50mm OD, 65nF at $2.05=20
Maplin YU83E 41 mm =A30.49

Damping
Magnet NdFeB 10 mm OD x 5mm high  Maplin YA29G  KJ Magnetics and many others=
 =20
                                            =20
Copper bar 5/8" OD

Alternative Damping
As an alternative to magnetic damping you can mount a brass L flange on top=20
of the V top suspension and attach either Sorbothane sheet or polyurethane f=
oam=20
to it and to both side glass boards.
Sorbothane from EdSci No. 3037000  Very good
Polyurethane Foam lightest grade - needs replacing annually - keep away from=
=20
light / sunshine

       You will need to drill and tap the brass mass / rod. This can be done=
=20
with a press drill, but it is much easier in a lathe.. To square off the end=
s=20
of the rod, file roughly square, then mount the rod in the chuck and press=20
lightly onto a flat file on the baseplate and then onto emery paper. Mark an=
d=20
centre the end holes, clamp the rod vertically in a vice, drill and tap to s=
uit=20
the bolts.  You may also need to 'true up' the head of the lower screw befor=
e=20
you solder it.
       To buy the brass and copper bars, you may need to find a non ferrous=20
metals stockist or a hobby shop which deals in metals. I have a local metals=
=20
supermarket and periodically visit it to find 'offcuts'.

Digikey USA and UK www.digikey.com=20
Edmund Scientific USA http://www.edsci.com/=20
Farnell UK & USA http://www.farnell.com/
Holdtite UK http://www.holdtite.com/
KJ Magnetics USA http://www.kjmagnetics.com
K&S Metals Hobby suppliers USA & UK www.ksmetals.com
Maplin UK www.maplin.co.uk
Mouser USA www.mouser.com
Squires UK www.squirestools.com

       Regards,

       Chris Chapman
In a message dated 2006/07/26, gmvo=
eth@........... writes:



has the tenacity to find the ne=
cessary raw materials




Hi there,



       See http://www.jclahr.com/science/psn/c=
hapman/piezo/PiezoSensAmp.jpg

       Not too difficult, more a question of k=
nowing what to look for and where to find it.



Materials



Double sided 1/16" thick glass circuit board 2" wide x 3.5" long - mo=
st Electronic's suppliers



Spacers 30 mm long x 3 mm tapped Farnell No 473-6047 Squires No 600-950

threaded standoff 1818K-ND 1.25" + 6-32 bolts + a couple of washers f=
rom http://dkc3.digikey.com/PDF/T053/1454-1457.pdf 



Bolts Brass 10 mm long x 3 mm dia Pan head // 6-32 x 3/8" US Home Depot / Lo=
wes

        Brass 10 mm long  x 4 mm dia=
 Pan head // 8-32 x 3/8" US Home Depot / Lowes



Brass foil 5 thou from K&S 



Brass 1/4" x 1/8" rectangular tube x 1.7" from K&S 



Brass bar 1/2" OD x 1.85" =3D 4.7 cm for 50 gm



Adhesive Holdtite ST3295 two part acrylic adhesive Squires There are=20=
several suppliers of similar products in the USA



Piezo disk 44 mm OD central sensor 25 mm OD Capacity 40 nF min typical 65 nF=


Farnell No 500-3301 No 9843744, 

Digikey 1N3595 diodes and PZT disks  p1421 for piezo elements - 1=
02-1170-ND 44mm OD, 70 nF at $1.62 

www.mouser.com 1N3595 diodes and PZT disks p1270 for piezo elements 665-KBI-=
4406 44mm OD, 70nF at $1.69 665-APS-100 50mm OD, 65nF at $2.05 

Maplin YU83E 41 mm =A30.49



Damping

Magnet NdFeB 10 mm OD x 5mm high  Maplin YA29G  KJ Magnetics and m=
any others           =
            &nbs=
p;            &n=
bsp;          

Copper bar 5/8" OD



Alternative Damping

As an alternative to magnetic damping you can mount a brass L flange on top=20=
of the V top suspension and attach either Sorbothane sheet or polyurethane f=
oam to it and to both side glass boards.

Sorbothane from EdSci No. 3037000  Very good

Polyurethane Foam lightest grade - needs replacing annually - keep away from=
 light / sunshine



       You will need to drill and tap the bras=
s mass / rod. This can be done with a press drill, but it is much easier in=20=
a lathe.. To square off the ends of the rod, file roughly square, then mount=
 the rod in the chuck and press lightly onto a flat file on the baseplate an=
d then onto emery paper. Mark and centre the end holes, clamp the rod vertic=
ally in a vice, drill and tap to suit the bolts.  You may also need to=20=
'true up' the head of the lower screw before you solder it.

       To buy the brass and copper bars, you m=
ay need to find a non ferrous metals stockist or a hobby shop which deals in=
 metals. I have a local metals supermarket and periodically visit it to find=
 'offcuts'.



Digikey USA and UK www.digikey.com 

Edmund Scientific USA http://www.edsci.com/ 

Farnell UK & USA http://www.farnell.com/

Holdtite UK http://www.holdtite.com/

KJ Magnetics USA http://www.kjmagnetics.com

K&S Metals Hobby suppliers USA & UK www.ksmetals.com

Maplin UK www.maplin.co.uk

Mouser USA www.mouser.com

Squires UK www.squirestools.com



       Regards,



       Chris Chapman