Current regulator doesn't work

Hi,

I'm trying to build a current regulator using multiple LM317s. I've had a go here: https://www.circuitlab.com/circuit/4ttpa5/current-regulator/ What I'm hoping should happen is the reading of the ammeter should remain the same even if the resistance of the lamp changes. It isn't working though, can anyone tell me why please?

Thanks,

Joe

by JoeS88
April 07, 2013

Nevermind, fixed it

by JoeS88
April 07, 2013

Joe... what was your fix? I took a stab, and this seemed to work...

https://www.circuitlab.com/circuit/cfwhnf/joes88-regulator/

Best BG

by bgilbertsound
April 11, 2013

Be careful using the CL LM317/LM137 models. Please see:

https://www.circuitlab.com/circuit/r3rtpc/lm317-test-cct-01/

https://www.circuitlab.com/circuit/jzwhf4/test-lm-317-voltage-regulator/

https://www.circuitlab.com/forums/support/topic/538um7b6/lm317-lm137-parameters-clarification-please/

https://www.circuitlab.com/forums/support/topic/ffgw6682/lm317-does-not-regulate/

by signality
April 11, 2013

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