I have a problem with the laser current. I have painted marks around the potentiometer. These marks matched the current. A month ago there was a shift. The potentiometer set to 10mA and the analog ampermeter showed only about 5mA. Today the potentiometer was set to 15mA and the ampermeter shows only 3mA. That’s too little to cut. A strange whistling sound is heard from the tube.
I heard this sound at low current before. It’s similar to this video:
I have 3 options
- Laser tube problem
- Problem with FLyback (my favorite)
- Problem with source board
Do you have any experience with gradually decreasing current?
Is there anything I can check?