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Current limiting circuitry

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Bonee90

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Current limiting circuitry involving tDCS

Hello, im new here and I have a special problem,
I would like to build a transcranial direct current stimulating device
you can find a lot of information on the web about it.
In theory it needs a 9 volt battery attached to two saline water soaked electrode
what is attached to the test subjects head, and the current flowing through the subject(the two electrodes) must be between 1-2 milliampere,
and unfortunately I'm not good at electronics, so I am asking You the experts to help me out,
What are the methodes to dynamically limit the current, so if even the resistance waries the current stays the same. Is it possible? what is the simpliest method?

Thanks in advance
Also i want to spark your interest :)

Bonee
 

if even the resistance waries the current stays the same? possible. Change the applied voltage. Based on V = IR.
 

I think you may be challenged to get 1mA through the meat
at 9V, but what you are looking for is a simple "current mirror"
scheme. At its simplest this would be a matched transistor
pair, and a bias resistor (or trimpot). The free collector will
push current fairly independent of voltage.

Whether putting DC current through the skull is a good idea,
I will leave to the "experts".
 

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