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  • 31-03-2013 5:19pm
    #1
    eoin95
    Closed Accounts Posts: 103 ✭✭


    Just wondering is the damage to the components in this picture a problem?
    Should there be something connected to the middle pin of the transistor or can it work as it is in the second picture

    Thanks


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    #2
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,695 Mod ✭✭✭✭Capt'n Midnight


    If there is a crater in the plastic then it's exploded, and yes it does happen and yes it's very very dead. - Have a look for the missing piece if you can.



    It looks like a TO220 package and usually the centre pin is connected to the heatsink - but it could be anything

    That doesn't mean it's connected to ground or zero volts BTW


    Without the missing numbers it's hard to confirm what it is ,
    though looks like a voltage regulator , but without looking further it's hard to know if it's for 5V or for 5V more ( 7812 + zener =17V )
    ( or if the 5.1V is kind of an idiot diode )

    at a guess , and it's a guess the circuit is just a 5V regulator and could be replaced with a 7805, but I cba looking the pinout to confirm or deny it.


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    #3
    eoin95
    Closed Accounts Posts: 103 ✭✭eoin95


    Capt'n Midnight wrote: »
    If there is a crater in the plastic then it's exploded, and yes it does happen and yes it's very very dead. - Have a look for the missing piece if you can.



    It looks like a TO220 package and usually the centre pin is connected to the heatsink - but it could be anything

    That doesn't mean it's connected to ground or zero volts BTW


    Without the missing numbers it's hard to confirm what it is ,
    though looks like a voltage regulator , but without looking further it's hard to know if it's for 5V or for 5V more ( 7812 + zener =17V )
    ( or if the 5.1V is kind of an idiot diode )

    at a guess , and it's a guess the circuit is just a 5V regulator and could be replaced with a 7805, but I cba looking the pinout to confirm or deny it.


    Thanks for that. It's part of a battery control unit in a caravan, there is 13-14 v being fed into this part but nothing coming out. The control unit works fine except the recharge part and I'm guessing this is the reason.


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    #4
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,695 Mod ✭✭✭✭Capt'n Midnight


    what voltage is the battery ? - because if it's not 4.8V then could be messy, even if it is 4.8v it's messy because they prefer constant current rather than constant voltage.

    can you contact the suppliers / check what part another similar caravan has


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    #5
    eoin95
    Closed Accounts Posts: 103 ✭✭eoin95


    Capt'n Midnight wrote: »
    what voltage is the battery ? - because if it's not 4.8V then could be messy, even if it is 4.8v it's messy because they prefer constant current rather than constant voltage.

    can you contact the suppliers / check what part another similar caravan has

    Yea, sent an email to manufacture of the unit the other day. Not sure if I'll get a response. The little blue diode has 5v1 as per the pic but also on the other side 88C and BZY printed on it. Not sure it that adds light to it!!


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