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Thank you for your time and effort in coming up with this design. I have ordered the parts and will connect everything up. Thanks again! I really appreciate it!!
One caveat (a little late). The design worked in simulation. I did not test it in hardware.Thank you for your time and effort in coming up with this design. I have ordered the parts and will connect everything up. Thanks again! I really appreciate it!!
Sorry about that.I have used the circuit presented by Roff and it works except for one little problem. When I adjust the pot to set the output to 4.00 mA, I sometimes am unable to set to to 4.00. On the board I am making now, it only goes to 4.02. Would it work to lower the two 10K resistors and use a bigger adjustment pot?? I looked at the AD694 and it looks like it would do the deed but I already have 15-20 boards in use and want to stay with the same design. Thanks!
See the edit to my previous post. And Audioguru is right, as usual. I used the LM324 spice model. I should have changed the posted schematic to use an LM358. Too late now, I suppose.There is certainly nothing to apologize for. I didn't have 1% resistors readily available and used 5% resistors. From your response, I can see that this is the cause for my predicament. If I had followed your design, it would have worked as I wanted. I will try your suggestion and use the 1% resistors. Thanks for your help!!