Opamps that can handle +-25V Vcc

[Dave]

Hello,

I am looking for opamps that can handle a rail-to-rail voltage of +-25
volts. The application of these is in a current source that provide a
max. of 10mA across a 2k load (load varies from 500ohms to 2Kohms).
Also, the experiment is such that there will be several current
sources firing into a muscle tissue at various close locations (about
50ohm interelectrode resistance), so each source must be able to
withstand interefence from the next source.

Also, since I'm building several of these (32 to be precise) the cost
of each needs to be reasonable.

Please reply if you have any ideas or suggestions.

Dave

 

[Stefan Heinzmann]

Dave wrote:

Hello,

I am looking for opamps that can handle a rail-to-rail voltage of +-25
volts. The application of these is in a current source that provide a
max. of 10mA across a 2k load (load varies from 500ohms to 2Kohms).
Also, the experiment is such that there will be several current
sources firing into a muscle tissue at various close locations (about
50ohm interelectrode resistance), so each source must be able to
withstand interefence from the next source.

Also, since I'm building several of these (32 to be precise) the cost
of each needs to be reasonable.

Please reply if you have any ideas or suggestions.

The OPA604/2604 is one that I remember. Otherwise you might want to
check out audio power amp ICs, they may work as OpAmps.

--
Cheers
Stefan

 

[Pig Bladder]

On Wed, 17 Nov 2004 14:40:15 -0800, Dave wrote:

Hello,

I am looking for opamps that can handle a rail-to-rail voltage of +-25
volts. The application of these is in a current source that provide a
max. of 10mA across a 2k load (load varies from 500ohms to 2Kohms).
Also, the experiment is such that there will be several current
sources firing into a muscle tissue at various close locations (about
50ohm interelectrode resistance), so each source must be able to
withstand interefence from the next source.

Also, since I'm building several of these (32 to be precise) the cost
of each needs to be reasonable.

Please reply if you have any ideas or suggestions.

Still trying to get that torture rack built?
--
The Pig Bladder From Uranus, still waiting for some hot babe to ask
me what my favorite planet is.

 

[Fred Bloggs]

Dave wrote:

Hello,

I am looking for opamps that can handle a rail-to-rail voltage of +-25
volts. The application of these is in a current source that provide a
max. of 10mA across a 2k load (load varies from 500ohms to 2Kohms).
Also, the experiment is such that there will be several current
sources firing into a muscle tissue at various close locations (about
50ohm interelectrode resistance), so each source must be able to
withstand interefence from the next source.

Also, since I'm building several of these (32 to be precise) the cost
of each needs to be reasonable.

You never have said if these 32 channels have 32 separate inputs for 32
different current values or are they all the same. I take it that in any
one channel the + source is the same current magnitude as the - source?
Also, do the different channel drives to the electrodes overlap in time-
or is it that when current is applied to any one electrode, all the
others are off? It would simplify things greatly if you answered these
questions.

 

[Spehro Pefhany]

On 17 Nov 2004 14:40:15 -0800, the renowned jacky_So_so@yahoo.com
(Dave) wrote:

Hello,

I am looking for opamps that can handle a rail-to-rail voltage of +-25
volts. The application of these is in a current source that provide a
max. of 10mA across a 2k load (load varies from 500ohms to 2Kohms).
Also, the experiment is such that there will be several current
sources firing into a muscle tissue at various close locations (about
50ohm interelectrode resistance), so each source must be able to
withstand interefence from the next source.

Also, since I'm building several of these (32 to be precise) the cost
of each needs to be reasonable.

Please reply if you have any ideas or suggestions.

Dave

LM675 will handle +/-30V and is not terribly expensive.

But it really sounds to me like you'd be better off with some kind of
galvanic isolation on each current source.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com