bipolar stimulator, ideas please.

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hey guys,

the requirement is to construct a two constant current stimulators delivering a max of 1.3mA (P-P) bipolar square pulses through a 2kohm load.

the two current sources are to be isolated from each other, additionally to enable independent control of the two current-sources they are to be controlled by a pic MC. The control signals which trigger the current-sources are also to be isolated. any ideas on how to achieve this.

thanks very much.
 

Control signal can be easily isolated by optocouplers, for the isolated power supply, you'll need some kind of transformer based DC/DC converter.
 
The problem seems not well expressed - pulsed currents
are not constant current, the isolation voltage matters
hugely in fundamental design choices and so on.

If this is supposed to be a TENS type application, usually
isolation is achieved by battery power.
 
heya, thanks for your replies.

@dick_freebird the square pulse is used to drive current source which would translate the pulse into a current.

the plan is to use PIC digital pin to generate 0-5V pulses, i would like to know how this can be level translated to 0-1V using an optocoupler, if the optocoupler is fed by +-3V supply at the stimulator end. any ideas regarding this would be of much help.

Thanks very much

Thanks
 

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