direct current stimulation

[mihov123]

I do not know much about eletronics, but I get around
Could you please help me with this

direct current stimulation
I need a battery powered constant current output of 1-2 mA,I have an Idea how to make this,
but I do not know how to cope with the skin resistance

It is important that the device is current controlled. What this means is that the device will adjust
the voltage up and down as the resistance changes so that the current never changes. For instance, if the
resistance of the skin is 10,000 ohms, then 10 volts will be needed to “push” 1 ma through the body. If for
some reason, the connection becomes poor and jumps to 20,000 ohms, then the device should
automatically increase the voltage to 20 volts in order to push the 1 ma current through the body.

Could could you tell me what I need to do, or give me a circuit similar to what I need.

Thank you

 

[eXnol]

you can use a constant current source like the ones used in LED drivers. ICs are available from

https://www.ti.com
**broken link removed**

All you need to do is adjust the sensing resistor so that the output current is what you want.