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  1. djQUAN

    LEP white light source -edit- LEP handheld flashlight build and test photos

    The OEM projector lens works quite well actually so I guess I'll be keeping that. I was looking at these before as a source of lenses but thought I'd try the ones I had on hand before spending which turned out great. I had finished the battery box using acrylic. An XT30 was used to make the...
  2. djQUAN

    LEP white light source -edit- LEP handheld flashlight build and test photos

    V2 pt2 The joys of having a laser cutter/engraver. I made cardboard spacers to fine tune the lens focus distance from the LEP module. A fan was added with a smaller heatsink to improve the operating duty cycle. The red and black 2mm jacks are for the thermistor sensor output built into the...
  3. djQUAN

    LEP white light source -edit- LEP handheld flashlight build and test photos

    V2 - Bigger lens = better output I have an old OEM projector headlight with the reflector bowl corroded but the lens is still good. I tested the lens by temporarily gluing it to the LEP module for testing. It does look promising and nearly all the light output from the LEP module is within...
  4. djQUAN

    LEP white light source -edit- LEP handheld flashlight build and test photos

    V1 build - proof of concept I used my laser engraver to transfer the cad drawing to aluminum plate for the lens and LEP holders to be able to test its performace. Here is the etched aluminum plate which was sprayed in black paint. LEP light source and a lens from DTR's projector lens...
  5. djQUAN

    LEP white light source -edit- LEP handheld flashlight build and test photos

    I wanted a LEP flashlight but it's too pricey and not available in my usual purchasing sites so I couldn't get one. I was suggested to check out an Ali store for an engraver head diode upgrade and stumbled upon this gem. https://www.aliexpress.com/item/1005002119384495.html It looks like an...
  6. djQUAN

    Blue Laser for Engraver Questions/Options

    As per RedCowboy's suggestion, I went ahead and bought the 5W diode with FAC. I mashed the old diode out since there was only a small hole to push it back where it came from. It still lights up but only LED mode. I pushed full power without heatsinking and the die half attached to the copper...
  7. djQUAN

    Blue Laser for Engraver Questions/Options

    No mention of backfill but with an advertised 48H burn in at full power with no degradation, I guess it should be fine for a while. Some limited testing and regular monitoring of output power every burn job, it seems to be stable and keeping its output power more stably than the original. This...
  8. djQUAN

    Blue Laser for Engraver Questions/Options

    Update: The original laser head has dropped to about 3W with 4A diode input. After doing some reading here, it appears the cause is an exposed diode which degrades with exposure to the environment. I looked for other brands and came across NEJE which seems reputable so I bought one of the...
  9. djQUAN

    Blue Laser for Engraver Questions/Options

    A little update Had a look inside the heatsink and the diode is pressed into a copper module which is threaded into the black aluminum heatsink. Back of the diode is bare with a bunch of silicone gunk. It appears to use a standard 9mm diode case so it is easy to get a replacement. Will be a...
  10. djQUAN

    Blue Laser for Engraver Questions/Options

    Not new to the high power blue laser game but I just got a low cost blue laser engraver for my projects. (proto pcbs, labeling enclosures, etc) The unit I got has a laser head (black one in attached pics) rated for 5500mW optical power. Right out of the box, used my Ophir LPM, it did about...
  11. djQUAN

    Need Feedback on my 3A buck driver!

    pin 6 actually needs a thicker trace than the feedback as it is the switching input (all load power goes through it) and preferably its own tap on the input capacitor. There is a way to artificially pull up the voltage at the feedback to lower the output current but it has a limited range when...
  12. djQUAN

    Need Feedback on my 3A buck driver!

    2 things: The input polarity protection mosfet - connecting it that way would risk damaging it at 18V. most mosfets are rated at 20V max gate -source voltage. A resistor and maybe a zener across gate to source to limit voltage and protect it. The dimming circuit. a quick look at the datasheet...
  13. djQUAN

    Dual color custom host 520nm and 635nm rebuild - merge my two lasers into one

    I have thought of that. But the front plate is 1.5mm thick so I will have to make a new one to accommodate the additional filters. This was done 100% free. Either way, the spot degradation does not matter as I often use it at full power. But still I appreciate the suggestions, I could use it in...
  14. djQUAN

    Dual color custom host 520nm and 635nm rebuild - merge my two lasers into one

    Correction. Drill was 0.46mm or 18mil. The spot size divergence became much poorer and got rings but it doesn't matter if you just want to keep below the legal limit or dim it to be able to use it in presentations. Opening the shutter makes everything great again :D These pics were taken at...
  15. djQUAN

    Dual color custom host 520nm and 635nm rebuild - merge my two lasers into one

    While playing about the laser before going to bed, I had an idea. What if I put tiny holes on the shutter so when it is closed, it restricts the beam and limits output power so I could bring it to countries with laser laws? Just an experiment to see what would happen. I had a "not so perfect...
  16. djQUAN

    Revived my PL450B pen laser build from many years ago

    lol someone forgot to check the pant pocket before doing the laundry. I was wondering for a while where my laser went and then it appeared along with the water corrosion.
  17. djQUAN

    Dual color custom host 520nm and 635nm rebuild - merge my two lasers into one

    Thanks! well, being not round means it doesn't roll away from you when you put it on a non level surface. ;)
  18. djQUAN

    Dual color custom host 520nm and 635nm rebuild - merge my two lasers into one

    That would be cool. It has been more than 6 years since I last bought laser diodes and now there are a lot of new different colors and powers. Budget is still tight though so it will have to wait until opportunity comes. If ever I get to make new color handhelds, it will probably have the same...
  19. djQUAN

    Dual color custom host 520nm and 635nm rebuild - merge my two lasers into one

    Thanks. Did a little more work on it. Couldn't leave anything done as it is, as usual ;) I dremeled some tiny channels on each side of the USB module and put in some tiny BB's in it to limit the flip out angle. You can barely see the BB on this. Limits the opening angle to only that much to...
  20. djQUAN

    Dual color custom host 520nm and 635nm rebuild - merge my two lasers into one

    **I also could have put this in the red lasers section but I like the 520nm green a little more. ;) Having nothing much to do during lockdown, I tore apart my two old lasers which both used cheap flashlights and broken lasers as hosts. I got tired of carrying several lasers on outdoor trips so...




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