M
m.carroll
Guest
Hey guys!
So i'm preparing the DDL driver circuit for my MXDL open can burner, and i'm testing it with 4x 1N4001 diodes as a 'dummy' load. The LM317T is set up with a 3 ohm resistor across Vout and Vadj. the battery supply is 2 RCR123a's putting out ~7.7 V (according to my multimeter). The current comes out correct at 420mA, however i get a reading of 3.4V across the diodes. What's going on?!?
EDIT: I just tried putting my laser diode in there, as i already had suspicions it was dead. Reading the voltage across the LD shows 7.1 V, which i assume is because its not letting any current through, so the lm317t rachets up the voltage to the max it can give (max batts can give). Does this 7.1V reading mean that my ld is dead? I'd like to know ASAP, so i can order another drive...but oy, 24 bucks down the drain, and not even a single red photon...damn.
(btw, i'm testing using rog8811's method of testing as described: http://www.laserpointerforums.com/forums/YaBB.pl?num=1197651171)
Thanks!
So i'm preparing the DDL driver circuit for my MXDL open can burner, and i'm testing it with 4x 1N4001 diodes as a 'dummy' load. The LM317T is set up with a 3 ohm resistor across Vout and Vadj. the battery supply is 2 RCR123a's putting out ~7.7 V (according to my multimeter). The current comes out correct at 420mA, however i get a reading of 3.4V across the diodes. What's going on?!?
EDIT: I just tried putting my laser diode in there, as i already had suspicions it was dead. Reading the voltage across the LD shows 7.1 V, which i assume is because its not letting any current through, so the lm317t rachets up the voltage to the max it can give (max batts can give). Does this 7.1V reading mean that my ld is dead? I'd like to know ASAP, so i can order another drive...but oy, 24 bucks down the drain, and not even a single red photon...damn.
(btw, i'm testing using rog8811's method of testing as described: http://www.laserpointerforums.com/forums/YaBB.pl?num=1197651171)
Thanks!