Hello,

Assuming I could made a nice rochelle salt crystal like the one shown
he http://seawhy.com/xlrs.html, any suggestions on how to proceed
to make a piezo earpiece?

Some possible thoughts:
a. Spring clamp copper plates to 2 opposing surfaces and test with a
multimeter for piezo effect, then super glue a malleus to the top
plate and touch it to a foil drum. The plates are the electrodes.
b. Make a foil 'setting' for a small crystal, and touch the crystal to
a foil drum. The 'setting' and the drum are the electrodes.
c. Load several small crystals into a shallow can and insert a copper
plate with malleus [which touches a foil drum. The can and plate are
the electrodes.

Joseph

I guess a look at the guts of an old piezo tweeter could give you a
hand. Or maybe, an old old crystal phonographic pickup?. An ultrasonic
cleaner perhaps?.

On Jul 13, 11:30 pm, lw1ecp wrote:
I guess a look at the guts of an old piezo tweeter could give you a
hand.

I had never heard of a piezo tweeter before your post. They sound like
a different type of device than what I am pursuing. I need an earpiece
with very high impedance, one that can work off of the nominal
potential a crystal radio circuit can produce.

But hey, thank you for the feedback, my world is ever so slightly
larger than before...

Go to http://www.allelectronics.com and do a search on their
website for "piezo".
They have a number of Piezo elements available at reasonable prices.
Arv K7HKL

On 15 Jul, 22:07, telcodev wrote:
On Jul 13, 11:30 pm, lw1ecp wrote:

I guess a look at the guts of an old piezo tweeter could give you a
hand.

I had never heard of a piezo tweeter before your post. They sound like
a different type of device than what I am pursuing. I need an earpiece
with very high impedance, one that can work off of the nominal
potential a crystal radio circuit can produce.

But hey, thank you for the feedback, my world is ever so slightly
larger than before...

Just caught the tail end of this conversation, but thought you might
find this of interest:

http://www.hpfriedrichs.com/rr-pzphone.htm

73
Pete
AC7ZL

Arv-K7HKL wrote:
Go to http://www.allelectronics.com and do a search on their
website for "piezo".
They have a number of Piezo elements available at reasonable prices.
Arv K7HKL

On 15 Jul, 22:07, telcodev wrote:
On Jul 13, 11:30 pm, lw1ecp wrote:

I guess a look at the guts of an old piezo tweeter could give you a
hand.
I had never heard of a piezo tweeter before your post. They sound like
a different type of device than what I am pursuing. I need an earpiece
with very high impedance, one that can work off of the nominal
potential a crystal radio circuit can produce.

But hey, thank you for the feedback, my world is ever so slightly
larger than before...

On Jul 24, 12:07 am, "H. P. Friedrichs" wrote:
Just caught the tail end of this conversation, but thought you might
find this of interest:

http://www.hpfriedrichs.com/rr-pzphone.htm

Thanks Pete,
Very interesting indeed; perhaps I can convince the local library to
stock one of your books.

Christian