Results 1 to 7 of 7

Thread: Analog laser tester

  1. #1
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,673

    Default Analog laser tester

    Analog laser tester, for people who need it, WITH TYPICAL RADIOSHACK PART NUMBERS

    Posted upon request for a beginner, use at own risk as I have no control over what and how you do things.

    BUILD IN A BOX LIKE RS 270-1802

    Solder all connections and place heat shrink tubing over ANY bare metal in the circuit, ok to bolt 7805 flange to box with 4-40 or possibly 6-32 screw and nut. note 7805 flange is at circuit ground. Note flange will not solder, use leads.

    I DO NOT want to hear, I built Mixedgas ^&*_*&*()&^ circuit and pin one shorted to pin 3 on the 7805 and then I hooked it up backwards and dumped minus nine volts into my analog input.....But its all Mixedgas fault even though he;s 750 to 5000 miles away and never saw it...... So PLEASE cover the bare spots in heat shrink tubing or use RTV silicon or similar to insulate the internal connections..... Not that 9V would harm most systems, but there are a few really cheesy lasers out there in PL land.

    EDIT: ADDED 1 kilo ohm resistor for protection of laser, use RS part number 271-005 or 271-1321 This will restrict current to 9 mA worse case or 5 mA normal.

    Use stranded wire, solid wire breaks when flexing.

    WORKS WITH MOST ttl LASERS TOO.

    SEE ATTACHED.

    TEST WITH VOLTMETER BEFORE USING WITH LASER, HOLD LEADS OF 7805 with pliars to keep cool while soldering, ie hold with pliars close to the case to prevent heating the silicon goodness inside. (Silicon Goodness sounds like something I picked up from Dr Lava)

    USE OF RADIOSHACK PART NUMBERS IS A ADMISSION THAT SOMETIMES ITS THE ONLY PLACE YOU CAN GET ELECTRONIC PARTS IN TOWN IF YOUR A BEGINNER, AND THAT RS PART STOCK OFTEN SUCKS AS ITS A NOW CELL PHONE STORE PRETENDING TO BE A PARTS PLACE, AND ITS SALES DROIDS HAVE NOT A CLUE. BUT ITS PARTS LINE IS USUALLY DECENT QUALITY. THIS IS NOT A ENDORSEMENT, BUT What YOU GONNA DO, ITS THERE AND ITS NATIONWIDE.
    ONCE UPON A TIME IT WAS GOOD..........

    DRAWN IN WALLEYE VISION (note for non USAians, A WALLEYE IS A FRESH WATER FISH WITH BIG SPHERICAL EYES)

    FROM THE MOVIE "HOT SHOTS", Pilot Jim 'Wash Out' Pfaffenbach says: "It's my eyes. I've got walleye-vision. ..."


    ALTERNATIVE DIGIKEY PARTS NUMBERS (AND THEY NOW WAIVE THE MINIMUM ORDER)

    LM7805CT-ND or LM7805ACT-ND
    --------------------------------
    377-1549-ND or 377-1549-ND
    --------------------------------
    360-1887-ND or 432-1074-ND or similar spst on/off panel mount
    ---------------------------------
    CT2159-ND or CT2205-ND
    ---------------------------
    478-3150-1-ND or 490-3811-ND or 445-4802-ND
    -----------------------------------------------
    HM377-ND or similar
    ----------------------------------
    OD102JE-ND or 1.0KQBK-ND
    ------------------------------------
    stranded wire and solder and heat shrink as needed.
    Attached Thumbnails Attached Thumbnails ANALOGTEST.bmp  

    Last edited by mixedgas; 09-17-2009 at 04:09.
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...

  2. #2
    Join Date
    Apr 2008
    Location
    Amsterdam, NL
    Posts
    2,098

    Default

    THANK YOU.

    What I do is I connect my QM2000 to my laser, open abstract generator, resize the circle to zero to get one static beam, click ok, open the color pallete, select manual.

    Now you will have R G and B sliders to increase or degrease the power/voltage of your lasers

  3. #3
    Join Date
    Dec 2008
    Location
    Southport, UK
    Posts
    2,746

    Default

    Thanks Steve,

    About an hour ago I was just driving back from visiting one of our construction sites, when boredom set in and my mind wandered.

    This is exactly what I was thinking about, saves digging out the laptop and DAC when you just want to do some quick checks or alignment.
    http://img62.imageshack.us/img62/3985/laser.gif

    Doc's website

    The Health and Safety Act 1971

    Recklessly interfering with Darwinís natural selection process, thereby extending the life cycle of dim-witted ignorami; thus perpetuating and magnifying the danger to us all, by enabling them to breed and walk amongst us, our children and loved ones.





  4. #4
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,489,335

    Thumbs up

    Hmmm... Cool idea. I think I need one of these! (Now where is my soldering iron?)

    Adam

  5. #5
    Join Date
    Oct 2008
    Location
    Portland
    Posts
    1,564

    Default

    Just reposting the design as a JPG so it shows in the thread rather than having to download it.... Thanks Steve I think I may have the stuff laying around to make one today.

    -Adam
    Attached Thumbnails Attached Thumbnails ANALOGTEST.JPG  

    Support your local Janitor- not solicited .

    Laser (the acronym derived from Light Amplification by Stimulated Emissions of Radiation) is a spectacular manifestation of this process. It is a source which emits a kind of light of unrivaled purity and intensity not found in any of the previously known sources of radiation. - Lasers & Non-Linear Optics, B.B. Laud.

  6. #6
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,673

    Default

    A few comments:

    Keep the filter cap close to the 7805 (within 3 inches) in case you have one of the very rare 7805s that oscillate a bit. Its very rare, but considering many PLers will grab used 7805s, its a decent precaution.

    OK to add 2-3 more pots in parallel for OUR GEE BEE VEE as needed, If using a lot of pots, 10-100 uf of filter cap on the lm7805 output might be a good idea if driving long (more then 50 foot) cables,more for eliminating the crosstalk noise as the pots move then anything else. . A .01 uf cap with one lead on the wiper and one lead to ground will eliminate any wiper noise as the pots move. Noise of course is not there in the steady state.

    You'd only see the noise when scanning anyways.

    A few extremists out there might want to wire this as a ILDA passthrough, but I'd suggest grabbing DZ's ILDA board and adding this if you want to do that, but I will make the drawing late tonight.


    Many of you who have cheesy lasers may find that changing the 1K to a 470 would work better for some TTL tests, but,,,,,, I don't endorse it.
    Steve
    Qui habet Christos, habet Vitam!
    I should have rented the space under my name for advertising.
    When I still could have...

  7. #7
    Join Date
    Dec 2008
    Location
    Southport, UK
    Posts
    2,746

    Default

    Quote Originally Posted by mixedgas View Post

    A few extremists out there might want to wire this as a ILDA passthrough, but I'd suggest grabbing DZ's ILDA board and adding this if you want to do that, but I will make the drawing late tonight.

    Are you hacked in to my webcam?!
    http://img62.imageshack.us/img62/3985/laser.gif

    Doc's website

    The Health and Safety Act 1971

    Recklessly interfering with Darwinís natural selection process, thereby extending the life cycle of dim-witted ignorami; thus perpetuating and magnifying the danger to us all, by enabling them to breed and walk amongst us, our children and loved ones.





Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •