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SMD Ceramic Componet Identification and Voltage question.

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    SMD Ceramic Componet Identification and Voltage question.

    Hello NewB here:
    Id like some help identifying some SMD parts for a Lenovo X1 Carbon Gen 2 or 3 Board.

    The suspected Capacitors in question look like Ceramic Capacitors to me.
    However some of these parts have 2 different voltages on each end. One is the voltage of the charger 20V and the other is lower at 7V+ .
    Can a Cap work without being connected to ground?

    To my novice understanding a cap should be connected to positive on one end and negative to another. The Cap without continuity to ground on either side has the two different voltages. Is this normal?

    I think the other strange caps doesnt have a side going to ground but doesnt show a voltage at one end either.


    #2
    Re: SMD Ceramic Componet Identification and Voltage question.

    Capacitors can be used anywhere in a circuit. They are not only used for decoupling or smoothing (in which case one side would normally be grounded), but for timing, coupling etc.

    Take a look at a random circuit diagram & you will find many capacitors not connected to ground.

    Even polarised capacitors don't need one end connected to ground. As long as the +ve end is connected to a voltage higher than that on the -ve end, then it will operate correctly.
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