bipolar stimulator, ideas please.

[zoulzubazz]

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.

 

[FvM]

Control signal can be easily isolated by optocouplers, for the isolated power supply, you'll need some kind of transformer based DC/DC converter.

 

[dick_freebird]

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.

 

[zoulzubazz]

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