Hi, I am going to design some kind of stimulating electrode circuit with some limitation parameters. I am using arduino pro mini as my microcontroller and using potentiometer (MCP4131) to control the voltage. I am having a problem on controlling the current produce since what its safe condition is 2mA. I have a rough ideas on this circuit which I will use op-amp (LM358) and transistor (BD135) connecting to the stimulating electrodes but I dont know if it will produce current as low as 2mA. So, my question are :
1) how can i control the current to be as low as 2mA?
2) do i need to place more resistors on the circuit and how much it is to be supposed to?
Any help would be very appreciated !! Thanks.
1) how can i control the current to be as low as 2mA?
2) do i need to place more resistors on the circuit and how much it is to be supposed to?
Any help would be very appreciated !! Thanks.