What electronics or electrical did you do today?

Discussion in 'Electronics & Electrics' started by /invariance\, Jun 9, 2019.

  1. /invariance\

    /invariance\ Member

    Joined:
    May 23, 2012
    Messages:
    847
    Location:
    Brisbane
    Today I replaced the caps in a 3Com switch
    138FBB86-2DBA-4BB3-AA85-561076966ED9.jpeg
    The bottom of the caps had all pushed out too. It’s a wonder none had popped.
     
  2. gdjacobs

    gdjacobs Member

    Joined:
    Apr 3, 2007
    Messages:
    1,368
    Location:
    MB, Canada
    KZE or KZG series?
     
  3. _zak

    _zak Member

    Joined:
    Oct 12, 2009
    Messages:
    343
    I've spent the last couple of days converting my microscope light from 240 V AC to 12 V DC. It was working fine, but I didn't trust the build quality - the microscope is great, but the light was definitely built to a price.

    Circuit is based on a 555 timer (I used this DIYODE article). I'm pretty happy with the result, particularly given it fits back in the original housing (after some 'mods' performed with side cutters and a craft knife).

    Light.jpg
     
    Last edited: Jun 11, 2019
  4. OP
    OP
    /invariance\

    /invariance\ Member

    Joined:
    May 23, 2012
    Messages:
    847
    Location:
    Brisbane
    KZG.
    Didn’t even consider that when replacing them, but probably anything would be a marked improvement on what was in there.

    Nice conversion.
     
  5. dakiller

    dakiller (Oscillating & Impeding)

    Joined:
    Jun 27, 2001
    Messages:
    7,855
    Location:
    Gippsland
    Not exactly today, but the latest thing I’ve been doing at home is this little board to build a POE based light switch controller

    97FB2C1B-B208-4CBD-B180-4CF3794C5E92.jpeg F1BEBF3E-6334-4139-BF3F-A3F29B9824F1.jpeg AA2B2573-4A17-499D-A39D-A8452F3C366A.jpeg 52CCB457-3C94-4C45-A1ED-2C1DBA87485E.jpeg 9011E764-C3F4-4DA6-B5D4-2823AE8719F1.jpeg
     
    goldpenis likes this.
  6. goldpenis

    goldpenis Member

    Joined:
    Jan 19, 2002
    Messages:
    497
    Location:
    VIC
  7. dakiller

    dakiller (Oscillating & Impeding)

    Joined:
    Jun 27, 2001
    Messages:
    7,855
    Location:
    Gippsland
    They aren’t pcb mount, I just put large holes for the lugs to fit. They’re RGB too :)

    U7 is for better routing out of the BGA. It is all very tight even with 4 layers
     
    goldpenis likes this.
  8. dirtyd

    dirtyd Member

    Joined:
    Jan 4, 2006
    Messages:
    3,962
    Location:
    Melbs
    Surface mount RJ45 feel OK physically? I am a bit wary of SMD for connectors like that. Guess it'll be set and forget though?

    Also love the "oops forgot those resistors" mod on J2 :lol:
     
  9. dakiller

    dakiller (Oscillating & Impeding)

    Joined:
    Jun 27, 2001
    Messages:
    7,855
    Location:
    Gippsland
    Second last picture, shows the large tabs securing it down as well. Micro USB's on just about every product are held down with less

    Leaving the resistors off wasn't the biggest oops either, see C29 and the via that I managed to put in that shorted the 3.3v and GND planes together. It is rare to prototype a PCB and not forget something or mess something up
     
  10. dirtyd

    dirtyd Member

    Joined:
    Jan 4, 2006
    Messages:
    3,962
    Location:
    Melbs
    Yeah I noticed those tabs just after I posted. I've used hybrid Micro USBs that are SMD pins with a couple of through hole posts, they feel pretty solid.

    I know what you're saying about rev 1 PCBs - last board I made had an RTC, first RTC I picked had integrated load caps for the crystal circuit. Then I decided the RTC needed alarms, changed RTC. New RTC requires external load caps, forgot to add them... surprise surprise, crystal no worky! DRC can't catch stupid shit like that :lol:
     

Share This Page

Advertisement: