Search results for query: *

  1. D

    New Driverboard Schematic

    Hey, thanks a lot!!! That was exactly the expaination I was looking for.
  2. D

    New Driverboard Schematic

    Is there anybody who is actually familiar with electronics and the driver circuits who can tell me why we can't just use a pot to bias a transistor like a 2222 to run the laser diode with a current limiting resistor in series? Thanks
  3. D

    New Driverboard Schematic

    The output of a diode is determined by the current through it, the current through it is determined by the series resistance that limits it. Tell me what is wrong with that statement? I know we want a constant current source, but since that is a ficticious device, we have to apply vary the...
  4. D

    Laser safety: read what you can do to yourself

    Thanks for the advisement, it is indeed a very serious topic! But on a lighter note, who submitted "Reflected beam caused exposure to head. Person felt warmth on forehead. " to the accident database?
  5. D

    New Driverboard Schematic

    How can you have a constant voltage with adjustable current? Current and voltage are related to eachother linearly. I don't think you can change the current through the laser diode without changing the voltage across it at the same time. Could you give me a more in-depth expaination arni...
  6. D

    New Driverboard Schematic

    Does anybody know why a driverboard couldn't consist of a voltage dividing pot driving a transistor with a resistor defining maximum current in series with the current path of the transistor and the laser? I can't seem to figure out why it isn't done this way, since it would be inexpensive and...
  7. D

    Prototype

    Does anybody have any reason why we can't use a transistor with a voltage dividing pot and keep a resistor defining max current in series with the diode?
  8. D

    PCB Printing

    Do most people need a current limit over 1 A, cause that would need bigger parts, but I was basically planning to use a darlington transistor setup with a pot. Pretty basic actually, but I think it would allow for a reliable current source if we use quality parts.
  9. D

    PCB Printing

    Are there a lot of people interested in new PCB's? I've come up with a pretty simple design and could probably get a lot of boards made if people were interested. It would consist of a higher quality pot, a higher maximum current level, and a higher quality switch. I could also make different...
  10. D

    Cheap Leadlights?

    I recently got a leadlight from vital and it didn't have the pot mod hole. I modded it and got 46mW just by doing the pot mod. It's wierd that they sell ones with the mod hole, I wonder if they have been returned or something. It would seem wierd for Leadlight to modify their pointers that...
  11. D

    PCB Printing

    So, is it Pulse Width Modulated in order to control the voltage level?
  12. D

    PCB Printing

    Could somebody tell me the electrical principal of powering the laser diodes? What is special about the green ones (I understand the optics of it, i.e. frequency doubling, etc) What happens electrically for the driver board to be that complicated?
  13. D

    PCB Printing

    I can get it done cheaper probably, I get boards made all the time. Does somebody already have the schematic, or do we need to make that too? And yes, we can put a bunch on one sheet. They are made through chemical etching, its really reliable.
  14. D

    Anyone else bought a laser from Vital-Spirit?

    [ QUOTE ] deezdrama05 said: very lucky double-e, Id leave it alone as not to break her. [/ QUOTE ] Yeah, for 50 bucks plus shipping, I'll take it! I measured it with fresh batteries and hit 46.5 mW, I'm not going to touch it, I'm sure I could only make it worse.
  15. D

    The Burning Threshold

    I just did the pot mod on a 105, measured it at 42 mW (very acurate measurement) and it burns a hole in a brand x trash bag
  16. D

    Anyone else bought a laser from Vital-Spirit?

    I got one from them a couple weeks ago, 8 mW stock, 42 mW just after doing the pot mod! It burns right through a trash bag.
  17. D

    Leadlight GPL-110 Modifications

    Re: Leadlight GPL-110 Information CHP, is there a way I could get your PSpice files, I'd like to see the way you simulated the optical feedback?
  18. D

    Leadlight GPL-110 Modifications

    Re: Leadlight GPL-110 Information [ QUOTE ] CHP said: I have a schematic together but the circuit looks "funky". I wouldn't have designed the circuit this way. I've simulated the circuit and it seems that the maximum current to the LD, if the feedback is disconnected, is much lower than the...
  19. D

    Leadlight GPL-110 Modifications

    Re: Leadlight GPL-110 Information Yeah, see how the switch covers the trace, it's hard to see what's going on under there.
  20. D

    Leadlight GPL-110 Modifications

    Re: Leadlight GPL-110 Information Are we sure of that? I don't know how to track down what that part is, it looks like it might be an active amplifier. I cant see where the ground from the neg end of the battery goes, it looks like it might pass through the switch then to the black wire on...

Latest posts

Back
Top