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tda 2003 general audio amplifier circuit

Discussion in 'Audio' started by shlomo1234, Jun 20, 2016.

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  1. shlomo1234


    Jun 20, 2016
    Hi all,

    In general, why we use high capacitor in the output (say 1000uF)
    where in the input smaller one like 1-2.2uF. In both way we want to block the DC right?

    Thank you
  2. BobK


    Jan 5, 2010
    Hi, and welcome to E.P.

    The size of the capacitor depends on the impedance of the circuit. A resistor and capacitor make a high pass filter. For audio, we want it to pass everything above about 20 Hz.

    In the input, you might have a 10K input impedance, and the capacitor that would result in a 20 Hz corner frequency is 0.8uF. For an output with an 8Ω speaker, the capacitor is about 1000uF.

    I calculated these using this on line calculator:

    Harald Kapp likes this.
  3. shlomo1234


    Jun 20, 2016
    Thank you very much Bob !!

    Also, the link helps a lot to understand (what i'v leared long time ago)

    Last edited: Jun 20, 2016
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