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I don't understand enough to accomplish this, constant current output to 1.5mA LED current to 20mA its simply been too long since I learned these things. Im only modifying an existing (likely popular) circuit.

Circuit

Greatly Appreciated.

user33915
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  • I tried modifying R7 from 2 - 2k ohms yet current did not increase past 8mA. – user33915 Apr 21 '18 at 07:59
  • Lower R6 to 100K. You might not have enough current at the base to amplify. – Oldfart Apr 21 '18 at 08:03
  • If you have additional information related to your original question, use the "edit" button to add the information there. Do not create a duplicate question. – Dave Tweed Apr 21 '18 at 11:31

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