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Does the TDA2030 need negative potential?

Discussion in 'Audio' started by rahulb, May 5, 2019.

  1. davenn

    davenn Moderator

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  2. Aniket Kumar Singh

    Aniket Kumar Singh

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    May 8, 2019
    For any kind of amplifier dual power supply is the first priority for any electronics engineer, however single supplies can also be employed. The basic difference is that if you apply dual supply topology then your signal gets amplified between +Vcc and -Vee. In case of single supply the amplification is between +Vcc/2 and -Vcc/2.
     
  3. Audioguru

    Audioguru

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    Sep 24, 2016
    Correct.
    I disagree. The amplification is between +Vcc and 0V.

    Also, many car amplifiers are single supply and are bridged for almost 4 times the output power of a single amplifier. Since each speaker wire is driven and each is at half the supply voltage then an output coupling capacitor is not needed to block the DC.
     
    davenn likes this.
  4. Aniket Kumar Singh

    Aniket Kumar Singh

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    May 8, 2019
    I agree , I meant to say that for example if you are using 12 volts the amplification will be between +6 volts
     
  5. Audioguru

    Audioguru

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    Take an LM386 little amplifier IC and power it from 12VDC and 0V. Its maximum output into an 8 ohm speaker is not 12V peak-to-peak, instead it has voltage losses that are shown on a graph in its datasheet as a typical maximum peak-to-peak of only about 6.5V, not 12V. Since the voltage swing is less then the current swing is also less so the actual output power is almost only 1/4 as much as you think.
     

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  6. WHONOES

    WHONOES

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    May 20, 2017
    If the Pk - Pk is only 6.5V then O/P power is only ((6.5 / 2) * 0.707) / R times the first part of the sum which equates to 1.32Watts into 8Ω at 12V supply.
     
  7. davenn

    davenn Moderator

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    that's still incorrect as there is no -6V
     
  8. Audioguru

    Audioguru

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    With an LM386 amplifier driving an 8 ohm speaker and a 12V supply, the speaker peak-to-peak voltage swing is +3.25V to -3.25V.
     
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