Hi, I need help with DC power stabilization to power UV LED at stable current 7 or 8mA.
This LED will be used as light source for spectrophotometry (light measurement) in an experiment.
The power should be clean and very stable. LED will be connected to the circuit using 50cm simple unshielded cable with switch. The power supply should have it’s own power switch and should be able to be always on. Temperature fluctuations should not interfere with power output.
This current stabilization circuit should run from 5V.
Current should be stable enough to reach stability at the second number after the decimal point or better.
I tried simple circuit LM317L with resistor but it will not run from 5V (has 3v drop itself, and my led will not work then) and it's not temperature stable either.
Thanks.
This LED will be used as light source for spectrophotometry (light measurement) in an experiment.
The power should be clean and very stable. LED will be connected to the circuit using 50cm simple unshielded cable with switch. The power supply should have it’s own power switch and should be able to be always on. Temperature fluctuations should not interfere with power output.
This current stabilization circuit should run from 5V.
Current should be stable enough to reach stability at the second number after the decimal point or better.
I tried simple circuit LM317L with resistor but it will not run from 5V (has 3v drop itself, and my led will not work then) and it's not temperature stable either.
Thanks.
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