How can i convert 0-5 Voltage source to 0-20mA steady current source using op amps?


can inputting 0 5 volts non inverting input of op amp. connect output of op amp 0 20 ma load, return of op amp go inverting input of op amp. connect 250 ohm resistor (series 220 , 33 ohm resistors) op amp ground.

op amp power supply should ± 12 volts not 24 , 0 volts. if have use 24 , 0 you'll have use second op amp create "0" volts ( 12 volts above ground), using 2 10k ohm resistors wired in series connected 24 , 0 volts of op amp supply, junction (12 volts) wired non inverting input of second op amp. second op amp connected voltage follower ( inverting input connected output). output of second op amp "ground 0 5 volt input , 250 ohm resistor.

v op amp not able provide 20 ma of current resistance load above 300 ohm since hit + 12 volt rail attempting so.

the problem cant produce steady current. changes when add different load.
supply voltage op amps 24v , 0v
potentiometer use change voltage 0 - 5v .


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