Sep 17, 2007 #1 L LarryQ 0 Joined Aug 13, 2007 Messages 726 Points 0 In those Newwish (dx) lasers that make use of a photodiode APC. Does simply cutting one of the wires work to disable it? OR should a static value resistor or a simple wire jumper be placed across the APC wiring pads after cutting the wires? Larry
In those Newwish (dx) lasers that make use of a photodiode APC. Does simply cutting one of the wires work to disable it? OR should a static value resistor or a simple wire jumper be placed across the APC wiring pads after cutting the wires? Larry
Sep 18, 2007 #2 laserrod 0 Joined Aug 3, 2007 Messages 342 Points 0 My 30mW has a extermnal PD wired backwards. It is two wire that go to the brase optics tube. The battery current should MAX about 230mA. Ans.: cutting a wire to PD will disable it if it's correctly wired. The circuit is 2 parts: a fixed current limiter with priority and a PD half that is adj... The circuit needs 3v Min. and won't get it from 2 batts. as designed. If I put 4.3v on my driver the batt. current is @400mA. The circuit is designed for 5v I think. That could blow the LASER diode! If you remove the 3.9k Res. connected the 15k, the current should go up.... The circuit is a crap-shoot. The current path has more voltage drops and that adds up to more than the source voltage. Go figure that!! Cheers [smiley=beer.gif].
My 30mW has a extermnal PD wired backwards. It is two wire that go to the brase optics tube. The battery current should MAX about 230mA. Ans.: cutting a wire to PD will disable it if it's correctly wired. The circuit is 2 parts: a fixed current limiter with priority and a PD half that is adj... The circuit needs 3v Min. and won't get it from 2 batts. as designed. If I put 4.3v on my driver the batt. current is @400mA. The circuit is designed for 5v I think. That could blow the LASER diode! If you remove the 3.9k Res. connected the 15k, the current should go up.... The circuit is a crap-shoot. The current path has more voltage drops and that adds up to more than the source voltage. Go figure that!! Cheers [smiley=beer.gif].