One diode is likely the CD diode, which is IR (~780nm) and almost invisible.Lowest mark was 13.1 and the upper 115 , but when i add voltage it is not stable, goes from 95-115 so, so i have bought today new components , lm317, diod , cap and res , i have textolite too, so i want to make new pcb for new driver , so please if you can give me shematic picture of good driver for dvd lase , also what is problem for me when i dissambled dvd , there are 2 lasers they are same for me )) also today i bought laser on the picture but as i guess i cannot use it for mini cnc , here are pictures of that diodes too, Its written 04WDW on first laser and the second one is in its heatsink
Diachi is right about that breadboard. Either solder the diodes or use the correct breadboard correctly. Do you own a constant current bench power supply? That would allow you to determine voltage drop on unknown laser diode and then custom tailor you test circuit.I thought the positive and negative rails on those breadboards consisted of one contact? In which case that's basically just a big short circuit with a 1ohm resistor thrown in.
Correct me if I'm wrong?