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This is the third time I have build this driver.I need to know what i am doing wrong. With the dummy load I have it set at 3 volts and the mv is reading 35.8, which = 358 ma's right or wrong? Every driver i have built seems to have the same problem. I have to turn the pot more than half way up...

built ddl circuit fried one, got help on second go around, Red Ld lasted thru 1 9v , discharged cap, replaced 9v and result is very little light. Maybe hooked up the lm317 to the digikey 100 ohm pot wrong. Maybe the 3.9 ohm resistor was the wrong choice for the driver. Don't know. Here is a pic...

got my first every ddl circuit 16xsony red laser up and running :) :) :) Now, I want to disconect from driver. 1 Do I discharge the cap before disconnecting the LD or do I disconnect and before connecting back up to ld discharge the cap.? Thanks Mike

any member here that is from virginia beach, virginia?

Just got my driver built (daedal) and built the dummy load (4diodesand 10hmres). Built just like the pics showed. My problem is that if you check the diodes and resistors you get nothing on the meter. But if you switch the polarity I get the proper measurements. Something isnt right. Or are you...

Can someone answer this question . Is the 1ohm resistor a 1/2 or a 1/4 that I will use in the dummy load along with the 4 diodes. Or does it matter. Thanks

newbe here from VA. Been doing a lot of research on this site. Great site. I will be building my first laser soon. My biggest problem is finding info on using a dmm to set the pot and where to put the leads. I have some experience with a DMM as I like to build stuff using leds. Any help would be...