I buy ceramic instead polyester film

Discussion in 'General Electronics Chat' started by eldar372, Aug 8, 2013.

  1. eldar372

    Thread Starter New Member

    Aug 8, 2013
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  2. MrChips

    Moderator

    Oct 2, 2009
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    Polyester capacitors are used in timing and frequency dependent circuits when higher stability and accuracy is required.

    Ceramic capacitors would also work in your situation and you would not be able to tell the difference.
     
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  3. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    The difference is in some of parameters like leakage and high frequency response, but none of this will matter in your audio frequency circuit, so don´t worry about it.
     
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  4. eldar372

    Thread Starter New Member

    Aug 8, 2013
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    How do I know what voltage capacitor to buy
    And how it will affect the circuit
     
  5. MrChips

    Moderator

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    Your circuit is powered by a 9V battery.
    Capacitors rated for 16V would work.
    Ceramic capacitors are typically rated at 16V, 25V, 30V, 50V, etc.
    Any of these would work with no noticeable difference.
     
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  6. SgtWookie

    Expert

    Jul 17, 2007
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  7. gootee

    Senior Member

    Apr 24, 2007
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    Once possible difference is that ceramic capacitors are much more microphonic than polyester. So, sound waves might cause the capacitor to produce small voltages.

    After you build and test the circuit, and it's working, with the system on and set to high volume but with no signal, try tapping on the ceramic capacitors, with a pencil (for example) and listen for noise from the speaker.
     
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