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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. 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.
  7. 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. ;)
  8. 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...
  9. 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...
  10. 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...
  11. djQUAN

    Revived my PL450B pen laser build from many years ago

    Nice. I was also thinking of using rocker switches, but with a really tiny battery, I didn't think runtime would last long so I just reused the momentary button switch and it's still fine. I didn't take a lot of pics but these are just what I had. For a laser diode and driver that went through...
  12. djQUAN

    Revived my PL450B pen laser build from many years ago

    I made a pen laser circa 2012-2013 powered by AAAs or 10440 cell and forgot about it in my pant pocket a while back and it took a bath with the laundry. Forgot about it for a few years then saw it dismantled with the diode and driver which survived the bath, waiting to be built into a new laser...
  13. djQUAN

    Car problems

    Yes, possibly the cat. As mentioned, have a shop use an A/F sensor test the exhaust if the downstream ones are reading right. There could also be a possibility that the wiring gets wet during rains and alters the output voltage of the o2 sensors. Have them inspect the wires and plugs.
  14. djQUAN

    Soldering thread

    It is mostly about the price. Copper prices have increased dramatically. If you are a manufacturer, saving $0.001 per part is a lot if you plan to make hundreds of thousands to millions of products, multiply that by the number of parts inside each product. For electrolytics, I think it would be...
  15. djQUAN

    Soldering thread

    All Electrolytics have steel leads, even the older ones. Most LED leadframes are steel. They corrode and rust when wet in those christmas lights used outdoors. I have compared 60/40 and 63/37 and the difference is clear. I only use 63/37 in all my projects or sometimes the 62/36/2 with silver...
  16. djQUAN

    Soldering thread

    I have quality solders that have expiry dates of about 2years from manufacture. It has something to do that the manufacturer can guarantee effectivity of the flux in wetting oxidized components. Although I have used ones that seem to work fine well past its "use by" date, I also noticed some...
  17. djQUAN

    Soldering thread

    Not sure if it has been mentioned before, get decent quality 63/37 eutectic solder rather than the old 60/40 blend. It results to much better looking joints. I had been using the old 30W cheap irons for years, stepped up to a cheap 60W temp controlled pencil (controller built into the handle...
  18. djQUAN

    "Box-o-lasers" Confocal Microscope teardown

    I saw the vid and thought the guys here at LPF should be all over it. Sure enough, it has been posted already :) Looking forward to the next vids.
  19. djQUAN

    Would you buy quality, used Li-Ion batteries?

    If only you were somewhere close. I could use all those protection PCBs. Mainly have a need for the current shunt they use and probably the switching mosfets and thermistors too.
  20. djQUAN

    Dumb Capacitor Bank Question

    I would think of using a same cap supply for a flash tube. A few hundred V and forget about contacts, use a beefy SCR to control the current and dump everything into the wire when triggered. I did that before using a thin wire to light up firecrackers from a photoflash cap charged to 300V...




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