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To get the total capacitance work out the formula below. This is tricky without a calculator.
CT = 1 / ( 1 / C1 + 1 / C2 + ... )
Using a calculator press the following keys... 1 / ( 1 / C1 + 1 / C2 + ... ) =
Of course you replace C1 and C2 with the capacitor values.
With two capacitors CT = C1 C2 / ( C1 + C2 )
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