Piezo- Electrode question

[Guest guest]

Piezo- Electrode question

Recently came across a website dealing with the neurophone, there is a post

there dealing with the electrodes, a Radio Shack part is recommended, however

this part is no longer available, especially here in Canada.

I am hoping to build a device and am hoping to source a piezo-electric tranducer

of either ceramic or crystal that is able to emit frequencies between the low

and high ranges of human hearing.

I have audio tracks as mp3 files, these files are different tones and pitches, i

want to send these through an audio amp, boost the signal, then have the

electrodes coming off the amp and in direct contact with the skin. Ideally, Id

like this to produce no sound to the passerby, but to the person wearing the

electrode they can physically feel the pulse and or hear the sound internally

via bone conduction

My problem is I dont know where to get these piezos or what to get exaclty, are

there any parts you can recommend? Part #'s, makes, models?

Below is reference info, but note, these part #'s no longer exist so I need

recommendations for new ones

dielectric transducers

Piezos made of Lead Zirconium

Titinate (1 inch diameter and 0.20 inch thick)(number stamp on piezo 7700+ or

7400+).

Piezos made from Radio Shack piezos (#273-073) worked better than Thinkmans.

Capcitance test:

Both ceramic faces placed together (total 0.4 inch thick approx)

.0009 microfarads

Piezos placed on temples:

.0015 microfarads

The LZT ceramic piezo worked on all circuits tested and seems to be the

prefered electrode sensor to use.....

1. Dig around in last years christmas stuff and get out a couple of those

musical christmas cards, the batteries are probably dead anyway.

2. Remove the piezo-electric elements from the music box circuits.These are the

metal disks usually in a white plastic resonating chamber. Be careful not to

break the lead that attaches to the ceramic part of the elements. The other

lead, to the metal base, you can cut or desolder. Pop the element out of the

plastic resonating chamber.

3. Solder the leads from the ceramic part of each element to a piece of phono

cable with a mono jack that will fit into the headphone jack of your walkman,

one to the signal and one to the ground. Only the one lead from the ceramic

portion of each piezo-electric elements should be attached to the phono cable.

You are actually forming a series circuit with your body as the middle element.

4. Put the phone plug into the walkman, use a stereo to mono plug adapter, and

hold both elements by the metal part, or glue them to a piece of purple cloth as

a headband with the metal half out. Your body completes the circuit and the

elements begin to vibrate. HEY LOOK MA I'M HEARING WITH MY SKIN.....NOT.

A new update from Terry Bastian (tabastian@... and his webpage is )

http://www.bdsnet.com/~tabastian says the Vahvastin amplifier IC is directly

replaceable by an NTE 1115 (also equivalent to an RCA brand SK3184 which sells

for $8.59). The piezo electrodes Terry has been experimenting with are Radio

Shack #273-073.

[Guest guest]

Try this from Digikey:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=102-

1126-ND

>

> Piezo- Electrode question

>

> Recently came across a website dealing with the neurophone, there

is a post there dealing with the electrodes, a Radio Shack part is

recommended, however this part is no longer available, especially

here in Canada.

>

> I am hoping to build a device and am hoping to source a piezo-

electric tranducer of either ceramic or crystal that is able to emit

frequencies between the low and high ranges of human hearing.

>

> I have audio tracks as mp3 files, these files are different tones

and pitches, i want to send these through an audio amp, boost the

signal, then have the electrodes coming off the amp and in direct

contact with the skin. Ideally, Id like this to produce no sound to

the passerby, but to the person wearing the electrode they can

physically feel the pulse and or hear the sound internally via bone

conduction

>

> My problem is I dont know where to get these piezos or what to get

exaclty, are there any parts you can recommend? Part #'s, makes,

models?

>

> Below is reference info, but note, these part #'s no longer exist

so I need recommendations for new ones

>

>

>

> dielectric transducers

>

>

> Piezos made of Lead Zirconium

> Titinate (1 inch diameter and 0.20 inch thick)(number stamp on

piezo 7700+ or

> 7400+).

>

>

> Piezos made from Radio Shack piezos (#273-073) worked better than

Thinkmans.

>

>

> Capcitance test:

> Both ceramic faces placed together (total 0.4 inch thick approx)

> .0009 microfarads

> Piezos placed on temples:

> .0015 microfarads

>

> The LZT ceramic piezo worked on all circuits tested and seems to be

the

> prefered electrode sensor to use.....

>

> 1. Dig around in last years christmas stuff and get out a couple of

those musical christmas cards, the batteries are probably dead

anyway.

>

> 2. Remove the piezo-electric elements from the music box

circuits.These are the metal disks usually in a white plastic

resonating chamber. Be careful not to break the lead that attaches to

the ceramic part of the elements. The other lead, to the metal base,

you can cut or desolder. Pop the element out of the plastic

resonating chamber.

>

> 3. Solder the leads from the ceramic part of each element to a

piece of phono cable with a mono jack that will fit into the

headphone jack of your walkman, one to the signal and one to the

ground. Only the one lead from the ceramic portion of each piezo-

electric elements should be attached to the phono cable. You are

actually forming a series circuit with your body as the middle

element.

>

> 4. Put the phone plug into the walkman, use a stereo to mono plug

adapter, and hold both elements by the metal part, or glue them to a

piece of purple cloth as a headband with the metal half out. Your

body completes the circuit and the elements begin to vibrate. HEY

LOOK MA I'M HEARING WITH MY SKIN.....NOT.

>

> A new update from Terry Bastian (tabastian@... and his webpage is )

http://www.bdsnet.com/~tabastian says the Vahvastin amplifier IC is

directly replaceable by an NTE 1115 (also equivalent to an RCA brand

SK3184 which sells for $8.59). The piezo electrodes Terry has been

experimenting with are Radio Shack #273-073.

>