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A fundamental electronic component that stores energy in an electric field, commonly used in filtering applications.

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Electret Condense Microphone, the function purpose of parallel capacitor

I got a schematic diagram of Electret Condense Microphone(ECM), shown as in the below. I would like to know the function purpose of C1 and C2. Each of value is 33PF and 10PF. Thanks.
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