(Topic ID: 253063)

Capacitor Polarity

By oldschoolbob

7 months ago

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  • 5 posts
  • 3 Pinsiders participating
  • Latest reply 7 months ago by oldschoolbob
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    #1 7 months ago

    While cleaning my MPU 100 I broke the capacitor at C5. (strange but it still boots). C5 is a radial tantalum 4.7 uF 25 V. I don't have any spares but I do have axial tantalum. I've heard stories about these things blowing up so I want to be sure I install it properly. It's not marked positive or negative. One end is tapered. The other end is square. Which is which.

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    #2 7 months ago

    Searching the internet I found this "chamfered end positive"

    I searched : axial tantalum tapered end

    LTG : )

    #3 7 months ago

    Thanks LTG. You'd think they would mark " + " for us non - electrical engineers.

    #4 7 months ago

    That would be a Kemet brand capacitor. It is marked with a "+" but isn't real clear about it. Rotate the part to find the voltage rating, the "+" sign is oriented towards the positive end.
    Marking is even worse with the dipped type capacitors -- you have to look for the teeny-tiny "+" symbol near one leg. Often there is a stripe near the "+" symbol making it look like one big negative symbol.
    Don't get these in backwards! Tantalums don't take nicely to that!

    #5 7 months ago

    Well, I'll be.... It is marked. Plain as day.

    How did my 73 year old eyes miss that.

    With the horror stories I've heard about installing them backwards you'd think they'd be marked better.



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