now attach your meter across the 1 ohm resistor and then attach your battery to the battery leads.
Make sure your meter is on DC Volts.
if it is all done correctly, you will see a 0.XXX DC Volts value, in this circuit, 1mV =~ 1mA so if you want 200mA then turn the pot until it reads 0.200 DC Volts.
oh, ok, so if I want 200mA I have to turn the screw on the pad till the correct value shows off, got it.
But is 200mA the value that grants maximum power to the laser? Can I choose other ones?
both, the more current on the load is more current being sucked from the battery.
you do not know the rating for your diode, i suggest you set it low then ramp it up from there.
I don't know, I replaced the battery when I started this topic, the brand is Nimex.
Actually I didn't buy it, an electrician left it here, I found it after a while and is only problem seemed to be the discarged battery.