Request DIY Constant Current Circuit

[svarbanu]

Hi
Could any one post a circuit where the user feeds the required ampere of constant current? output range is 1 milliA to 15 mlliA and 10 to 30 Vdc.

edited to correct the ouput i which have posted mistakenly as microA to milliA

 

[kripacharya]

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.

 

[svarbanu]

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?