Here is a website (one of 100's) which has several constant current source circuits.
Note that simultaneous control of output current AND voltage basically implies a very specific load. However, I assume the voltage range is the input voltage range, so no problem there.
Hi
I have to use this for an electrolysis where the voltage increases after sometime due to increased ions in the electrolyte. but the current needs to be constant.
I have made a circuit with lm317 and variable transistor. But i have not monitored the current dynamically. will this suffice?