Optically isolated audio cable

A

Adam Sargant

Guest
Does any one know of a manufacturer/supplier of optically isolates
audiocables that I could use to connect a small biofeedback device that
generates a tone to the microphone input of a PC?

Thanks in advance for you help

Adam Sargant
 
"Adam Sargant" <nospam@sargant.net> writes:

Does any one know of a manufacturer/supplier of optically isolates
audiocables that I could use to connect a small biofeedback device that
generates a tone to the microphone input of a PC?
Click to expand...
DO you absolutely need optoisolation ?

Would just an audio frequency isolation transformer be
suitable for your application ?



--
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at
http://www.epanorama.net/
 
On Wed, 6 Oct 2004 21:29:36 +0100, "Adam Sargant" <nospam@sargant.net>
wrote:

Does any one know of a manufacturer/supplier of optically isolates
audiocables that I could use to connect a small biofeedback device that
generates a tone to the microphone input of a PC?
Click to expand...
How about this:
http://www.harmonictech.com/cyberlight_release.asp

Kal
 
"Tomi Holger Engdahl" <then@solarflare.cs.hut.fi> wrote in message
news:lajvfdm9a0a.fsf@solarflare.cs.hut.fi...
"Adam Sargant" <nospam@sargant.net> writes:

Does any one know of a manufacturer/supplier of optically isolates
audiocables that I could use to connect a small biofeedback device that
generates a tone to the microphone input of a PC?

DO you absolutely need optoisolation ?

Would just an audio frequency isolation transformer be
suitable for your application ?
Click to expand...
eep... I don't know, I'm no electronics engineer, though I do know one :)

I'm working on a piece of software that would interact with the galvanic
skin response expressed as an auditory tone, and the easiest way I could
think of doing this was to plug the (already comercially available) GSR
device into the line in or mic in of a pc... but I am advised that if the
application is ever to be commercially viable (it may not be, that's a long
way down the line) I would be required to isolate the GSR device from the
PC, for the obvious reasons... if there is another way of doing it, I would
be grateful for any references.

Adam
 
"Kalman Rubinson" <kr4@nyu.edu> wrote in message
news:5aoam0p5880je423sa8l3k5mdanll8gtod@4ax.com...
On Wed, 6 Oct 2004 21:29:36 +0100, "Adam Sargant" <nospam@sargant.net
wrote:

Does any one know of a manufacturer/supplier of optically isolates
audiocables that I could use to connect a small biofeedback device that
generates a tone to the microphone input of a PC?

How about this:
http://www.harmonictech.com/cyberlight_release.asp
Click to expand...
Way out of my cost league, but thanks for the response

--
Adam Sargant
 
On Thu, 7 Oct 2004 18:57:47 +0100, "Adam Sargant" <nospam@sargant.net>
wrote:

I'm working on a piece of software that would interact with the galvanic
skin response expressed as an auditory tone, and the easiest way I could
think of doing this was to plug the (already comercially available) GSR
device into the line in or mic in of a pc... but I am advised that if the
application is ever to be commercially viable (it may not be, that's a long
way down the line) I would be required to isolate the GSR device from the
PC, for the obvious reasons... if there is another way of doing it, I would
be grateful for any references.
Click to expand...
---
You don't really need anything fancy; you ought to be able to do it
with a simple optoisolator.

--
John Fields
 
"Adam Sargant" <nospam@sargant.net> wrote

Does any one know of a manufacturer/supplier of optically isolates
audiocables that I could use to connect a small [skin resistivity]
biofeedback device that generates a tone to the microphone input of a PC?
Click to expand...
Use a small 1:1 transformer - one winding connected to the gizmo's speaker
terminals - plug the other winding into the 'line' input. Any transformer
will work.

If the device generates a tone might you tape a microphone to it and
plug the mic into the PC? It would get you going for next to $0.00.

--
Nicholas O. Lindan, Cleveland, Ohio
Consulting Engineer: Electronics; Informatics; Photonics.
Remove spaces etc. to reply: n o lindan at net com dot com
psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
 
"Adam Sargant" <nospam@sargant.net> wrote in message
news:2sledjF1m76meU1@uni-berlin.de...

but I am advised that if the
application is ever to be commercially viable (it may not be, that's a
long
way down the line) I would be required to isolate the GSR device from the
PC, for the obvious reasons... if there is another way of doing it, I
would
be grateful for any references.
Click to expand...
What's the output of the GSR device?

Analog? Perhaps you could digitise it using a battery powered PIC (or
similar and have the PIC output TOSLINK.
 
In article <2sledjF1m76meU1@uni-berlin.de>,
Adam Sargant <nospam@sargant.net> wrote:
I'm working on a piece of software that would interact with the galvanic
skin response expressed as an auditory tone, and the easiest way I could
think of doing this was to plug the (already comercially available) GSR
device into the line in or mic in of a pc... but I am advised that if the
application is ever to be commercially viable (it may not be, that's a long
way down the line) I would be required to isolate the GSR device from the
PC, for the obvious reasons... if there is another way of doing it, I would
be grateful for any references.
Click to expand...
Does the GSR device have a speaker of its own, even a tiny one? I'd
try connecting it to a cheap mic through a long piece of plastic
tubing, instead of a cable. That'd conduct sound well, but provide
good electrical isolation.

--
Wim Lewis <wiml@hhhh.org>, Seattle, WA, USA. PGP keyID 27F772C1
 
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