I am in the process of evaluating various Laser Power Supply interface designs to

Lasers
,
1

I am in the process of evaluating various Laser Power Supply interface designs to the smoothie without a schematic.

  1. If you have found a schematic would you please send me a link.
  2. If you have a dead LPS ( MYJG40W) that you are willing to donate so that I can take it apart and map out the interface I would be happy to pay reasonable shipping. I live in the US at 84092.

I think having a better idea of what is under the covers would help us all.

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I’ll keep you in mind if mine dies anytime in the near future.

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Are you interested in how the PSU works, or just the pinouts? FWIW, I read somewhere early on that on my PSU, the two enable lines each ground an optoisolator, which makes them pretty safe to control.

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I would like to model the AC and DC characteristics of the inputs. There are lots of questions in my mind like the response of the enable signals TH/TL to a PWM input and the reaction of the IN signal to PWM & a pot that creates a DC offset. I won’t be happy with the level shifter connected to the IN signal that we are all using until I understand how the power supply’s interface works :).
What type of setup do you have to your laser power?

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@donkjr I am PWM controlling the TL (or TH?) signal and leaving the IN connected to the pot. I did this in part because I made a switchable adapter board that lets me go back to the Moshiboard, and it was easiest to control the PSU with the same inputs. I don’t need a level shifter but am buffered by an on-board mosfet on my AZSMZ mini. It works well now that I’ve tuned the PWM frequency to give me a smooth grayscale ramp. I’m guessing it works only because of internal capacitance/inductance of the power supply, since TL and TH are digital inputs which I normally wouldn’t expect to be PWM-controllable. I’d also be interested in definitively knowing what is inside the PSU, however.