I'm trying to replicate this circuit for a 2W laser diode engraver. I could understand most of the other components except the current source schematic (Pg. 5, Fig 4). I understand that the TLC271 is being operated in high-bias mode (cause the datasheet says that when the bias select pin is grounded its in high-bias mode), however, I do not understand how the combination of RV2, R16 and R18 works and what values need to be set. Any help would be appreciated. Thanks.
1 MB Views: 31
2.2 MB Views: 22