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I am building an FM radio circuit and a 27pF capacitor (ceramic) is required in that, but I don't have one. But I do have 56pF capacitors. So I was thinking that I can use two 56pF in series to get an equivalent 28pF.

Is it possible and will it affect the circuit?

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Yes, you can do that.

And FM radio is not DC; it actually involves frequencies around 100 MHz.

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  • \$\begingroup\$ Sir i have another doubt. what is the difference between Ceramic filters and crystal oscillators. Can filter be substituted by the crystal oscillator? \$\endgroup\$ – alnLucky Apr 2 '15 at 15:50
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    \$\begingroup\$ That's an entirely separate topic. You should start a new question for that one. \$\endgroup\$ – Dave Tweed Apr 2 '15 at 15:54

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