Hmmm. Are there fake lm338s/lm317? I bought this on ebay. I already damaged a few. lm338 cant give more than 1.8A, i thought it has thermal protection but mine sometimes die instantly. I think my wiring is correct since its working fine around 1A. Thanks all for your time.
Thanks for the replies. I checked my wiring again and I just found out that lm338 Tab is touching the heatsink, my ndb7875 diode is also on the same heatsink. Is the diodes housing(dunno what to call) connected to diodes circuit? :(
Hi! I don't want to start another topic just for this simple question, so i'll ask it here.
Is it bad to put capacitor on the output of LM338 constant current? My ndb7875 stopped working, the last thing I did was add output capacitor. :(
Could it kill the diode instantly? I didn't even see it lit.
I put the copper module that way so that I can remove the diode when needed, I thermal glued it. I think it's still heatsinked since the casing before the copper is alluminum, but im not sure,I only tried it for a min and it's not hot.
Yes this is 9mm 445nm from dtr, Do you know if I can...
HI! im new to lasers, if We always need to wear goggles when using high powered laser, how are we going to see or enjoy the beam? i tried using my laser outside and wearing goggles, I cant see the laser, it seems more dangerous.
Hi! I've NDB7875 Diode and LM338 Regulator.I used .7(.666) Ohm resistor on LM338, expecting 1.7A Current.
Are 2x 16850 batteries enough if I want around 1.5A current? I tried using 2x 16850 and it's only around 600mA, I tried 3s Lipo and it's working, 1.55A. I just wanna be sure before I extend...
Thanks for the reply! What im talking about is the voltage given to the diode not the driver.lets say im not using a constant current source, just a voltage regulator, If ex. 4V is going to the diode the max current should just be .4 so that it won't exceed 1.6w rating of the diode? Sorry for my...
Hi! Pls help me understand laser power rating. Im newb at electronics.
If the laser diode is rated for ex. 1.6W does it mean, if Im putting 4V to the laser, I shouldn't be pulling more than 400mA since 4V x .4mA = 1.6W even if my laser diode Current rating is 1.7A?
How about when Using...