Electrode source and electrode safety
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Posts: 46,084
If you are considering putting electrodes on someone's body you must,
MUST isolate the electrode from your circuitry. It's imperative to
protect the "subject". There are all sorts of ways that voltages can
get back from your circuitry to the patient or subject unless you
isolate them. There are, of course, all sorts of analog opto-
isolators sold by Agilent, TI (Burr Brown), Siemens, Intersil etc.
The signals you will be slow moving, and around 1 mV with plenty of
noise (from 1 to 100 Hz).
--- In basicstamps@y..., sean975@a... wrote:
> Does anyone know where I could purchase electrodes to place on
one's skin in
> order to sense the electrical signals that are contracting
muscles? If you
> don't, could you help send me in the general direction? Thanks.
> -Sean
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
MUST isolate the electrode from your circuitry. It's imperative to
protect the "subject". There are all sorts of ways that voltages can
get back from your circuitry to the patient or subject unless you
isolate them. There are, of course, all sorts of analog opto-
isolators sold by Agilent, TI (Burr Brown), Siemens, Intersil etc.
The signals you will be slow moving, and around 1 mV with plenty of
noise (from 1 to 100 Hz).
--- In basicstamps@y..., sean975@a... wrote:
> Does anyone know where I could purchase electrodes to place on
one's skin in
> order to sense the electrical signals that are contracting
muscles? If you
> don't, could you help send me in the general direction? Thanks.
> -Sean
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
Comments
http://www.analog.com/library/analogDialogue/archives/34-
01/haystack/index.html
--- In basicstamps@y..., "caveteursus" <j.walton@a...> wrote:
> If you are considering putting electrodes on someone's body you
must,
> MUST isolate the electrode from your circuitry. It's imperative to
> protect the "subject". There are all sorts of ways that voltages
can
> get back from your circuitry to the patient or subject unless you
> isolate them. There are, of course, all sorts of analog opto-
> isolators sold by Agilent, TI (Burr Brown), Siemens, Intersil etc.
>
> The signals you will be slow moving, and around 1 mV with plenty of
> noise (from 1 to 100 Hz).
>
>
> --- In basicstamps@y..., sean975@a... wrote:
> > Does anyone know where I could purchase electrodes to place on
> one's skin in
> > order to sense the electrical signals that are contracting
> muscles? If you
> > don't, could you help send me in the general direction? Thanks.
> > -Sean
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
UL approved, but the more expensive one I was using at the time was not.
Had to do a complete board re-design to include the ISO124P for a
medical product. You can check the UL web site for a particular
component < www.ul.com >.
If you're thinking about a commercial product, you'll need FDA/UL
approval. Consulting with UL first will save you money and time down
the road. Been there.
Dennis
WSR Inc
Pasadena CA
Original Message
From: caveteursus [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=b3a35v7STm6i7QqYIabRzejX0BKMxY2zxsfv8Gy49C8_AQXOwLo1UNQV9LVz9QC4E2-8pcpCgA]j.walton@a...[/url
Sent: Friday, September 06, 2002 6:53 AM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Electrode source and electrode safety
If you are considering putting electrodes on someone's body you must,
MUST isolate the electrode from your circuitry. It's imperative to
protect the "subject". There are all sorts of ways that voltages can
get back from your circuitry to the patient or subject unless you
isolate them. There are, of course, all sorts of analog opto- isolators
sold by Agilent, TI (Burr Brown), Siemens, Intersil etc.
The signals you will be slow moving, and around 1 mV with plenty of
noise (from 1 to 100 Hz).
--- In basicstamps@y..., sean975@a... wrote:
> Does anyone know where I could purchase electrodes to place on
one's skin in
> order to sense the electrical signals that are contracting
muscles? If you
> don't, could you help send me in the general direction? Thanks. -Sean
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
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exactly like the Burr Brown ISO100 and the Siemens IL300. The
HCNR200 is about $2.50 in units of 10's. Agilent also has an
application note on designing with analog opto-couplers. So far I
haven't been able to get the Agilent HCPL-7840's to work as they
should, but the claimed non-linearity is better than 0.004%