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Size matters

Discussion in 'General Electronics Chat' started by camerart, Nov 7, 2017.

  1. ClydeCrashKop

    ClydeCrashKop Well-Known Member

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  2. camerart

    camerart Active Member

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  3. ClydeCrashKop

    ClydeCrashKop Well-Known Member

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    Now that you mention it... This one has a slight delay too. A fraction of a second. If you slide a soldering iron tip off an SMD pin, you feel it before you see it.
     
  4. dave

    Dave New Member

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  5. jpanhalt

    jpanhalt Well-Known Member Most Helpful Member

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    You might be surprised at how short a delay can still matter. Electronic scanning of histology slides isn't affected by such delays, but pathologists are. That's one reason I still trust in my magnifying visor. I also have an optical "dissecting" microscope, but haven't yet found the need to use it.

    I use my cheapo electronic microscope only for making pictures.

    John
     
  6. camerart

    camerart Active Member

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    Hi,
    As mentioned, I used a hot air gun to solder the PIC, all seemed well , but there are faults (connected PINs) now I'm wondering if I heated the PIC too much?
    C.
     
  7. throbscottle

    throbscottle Well-Known Member

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    You mean solder bridges? Unlikely to be caused by overheating. I get them all the time unless I'm very careful. Bit of solder wick will clear them up.
     
  8. throbscottle

    throbscottle Well-Known Member

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    I got a USB microscope (very cheap, about £5 I think) so I can read SMD markings. Hardly ever use it, I forget I've got it and use a small x10 magnifier, but then I'm looking at that through an illuminated x2 magnifier too! I really need to get round to building Shed-puter, then I might remember when I'm not having to balance the laptop on top of stuff... (end of ot rant...) But going back to the microscope, can't say I've noticed a delay with it.
     
  9. camerart

    camerart Active Member

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    Hi,
    I have a solder station with hot air gun, and find that I alternate between gun and iron, depending on these situation.
    Likewise, I have a magnifier, and microscope, which I also alternate between.

    Regarding the fault! I removed the PIC (44PIN) and there was quite a mess under it, where the solder paste hadn't flowed properly, also there was far too much. I cleaned it off and replaced the PIC, where all of the pins were tested for contact and ok, but I did a quick program, which didn't flash the LEDs as expected. I'll try another test tomorrow.

    EDIT: I had the oscillator wrongly set, now the LEDS flash ok, so it appears the PIC is ok:)
    C
     
    Last edited: Nov 23, 2017
  10. throbscottle

    throbscottle Well-Known Member

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    Well done you :D
     
  11. jjw

    jjw Member

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    Has anyone tried the dentist binoculars sold on Ebay?
    Magnification from 2.5x to 6x and working distance about 400mm.
    I suspect the optical quality is not good, at least on the cheap ones.
     
    Last edited: Nov 23, 2017
  12. camerart

    camerart Active Member

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    Hi,
    If you looked at my schematic and PCB, you will see connectors used to connect top and bottom tracks. This isn't a good idea, as it takes a long time and a lot of messing about.
    I'll have a re--think.
    C
     

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