can we use this for laser diodes? how to control the current in this. I am not seeing no pot or resistors. I want to make a constant current of 300mA.Maybe just U1 is blown, and you can just replace it, if you can find out what it is. Here's a typical "boost" converter with a minimum of pins. CE = enable. So, only 3 pins are really involved in the boost.
View attachment 79501
John
I have had similar SMT boards come from China that were obviously soldered crudely with a hand operated iron.That circuit is small enough that you could draw your own. Good luck finding one from manufacturer. Who soldered this board?
That's very sketchy. I've had students solder better on their first attempts. Amazing some of the junk that is out there.I have had similar SMT boards come from China that were obviously soldered crudely with a hand operated iron.
Max.