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  1. #1
    Join Date
    11th September 2013
    Posts
    199

    Broken wires on my Eggfinder

    Where the battery wires connect to the circuit board on my Eggfinder, the wires have broken off. This also happened last year on my other unit. The wires seem pretty thin. Is there anything I can do to reduce the likely hood of the wires breaking?

    Gregg
    NAR #97216

  2. #2
    Join Date
    20th July 2016
    Posts
    15
    Yes, once you repair the wires. Secure the wires into the board with a dab of hot glue. The glue acts as a strain releif and the problem will be solved.


  3. #3
    Join Date
    7th July 2013
    Location
    Toronto
    Posts
    2,972
    Are they soldered to the board or did you get the headers and screw your wires in? If you didn't get the headers then you might want to pick them up, solder to the board then screw your wires in place as well as tie-down your wires with some strain relief.
    Michael Pitfield
    TRA 14579 L2
    NAPAS BoD
    URRG
    MARS
    CRC

  4. #4
    Join Date
    11th September 2013
    Posts
    199
    They are soldered to the board. What are headers?
    Gregg
    NAR #97216

  5. #5
    Join Date
    27th December 2012
    Posts
    257
    Quote Originally Posted by DinoAP View Post
    Yes, once you repair the wires. Secure the wires into the board with a dab of hot glue. The glue acts as a strain releif and the problem will be solved.
    Hot glue works great. I use it on every wire soldered to the board.

    Click image for larger version. 

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  6. #6
    Join Date
    7th July 2013
    Location
    Toronto
    Posts
    2,972
    Quote Originally Posted by Swissyhawk View Post
    They are soldered to the board. What are headers?
    Here are three of my eggtimers, two with top mount transistors, one with bottom mount, all with the green headers soldered for power and on the pyro channels.



    Here is a pic of the same type of headers, but sized for my Missile Works screw switches



    And just for reference this is how the screw switches assemble, again the header allows me to screw and clamp down my wires, my preference, instead of soldering them to the PCB

    Michael Pitfield
    TRA 14579 L2
    NAPAS BoD
    URRG
    MARS
    CRC

  7. #7
    Join Date
    3rd February 2012
    Location
    So Cal (ROC, TRASD, SCRA)
    Posts
    2,335
    Quote Originally Posted by Swissyhawk View Post
    Where the battery wires connect to the circuit board on my Eggfinder, the wires have broken off. This also happened last year on my other unit. The wires seem pretty thin. Is there anything I can do to reduce the likely hood of the wires breaking?
    Are you referring to the circuit board traces? The battery pads are double-sided and plated-through, so it would take a significant amount of force to pull one out of the board. If you're talking about battery pigtail leads, they can break under flex if you use solid wire, or if you have a cold solder joint. I recommend soldering them to the pads through the holes (I've seen people just tack them to the top of the pads, that CAN lead to the traces breaking off), and securing them to your sled with zip ties next to the board. If it can't move, it can't come loose.

  8. #8
    Join Date
    11th September 2013
    Posts
    199
    It's the wires that broke, not the board. They broke off above the solder, where the wire itself goes into the wire insulation.

    Thanks for the suggestions on the hot glue.
    Gregg
    NAR #97216

  9. #9
    Join Date
    26th November 2009
    Posts
    4,083
    Quote Originally Posted by Swissyhawk View Post
    It's the wires that broke, not the board. They broke off above the solder, where the wire itself goes into the wire insulation.

    Thanks for the suggestions on the hot glue.
    I believe with ebay maintenance unsupported wires flex and stranded wires become solid wires after soldering. Recurrent flexing leads to eventual fracture and
    the de-soldering iron or wick has to come out. Same thing can happen to the stripped wire that is screwed into headers/screw terminals but if there is excess wire, just need to strip and re-insert. If the wire can move it will eventually break which makes glue gunning and strain relief a good idea for long term
    integrity, Kurt


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