class AB amplifier (30-50)W

Discussion in 'The Projects Forum' started by abdus, Jun 10, 2010.

  1. abdus

    abdus Thread Starter New Member

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    i want to design a class AB amplifier ranges from (30-50)w.
    can anyone plz send me schemetic?
  2. R!f@@

    R!f@@ AAC Fanatic!

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  3. abdus

    abdus Thread Starter New Member

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  4. R!f@@

    R!f@@ AAC Fanatic!

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    sorry buddy, they are not complete schematics.
    Just tutorials on output stages.
  5. abdus

    abdus Thread Starter New Member

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    ohk..:(
    but i want to built such an amp..:confused:
  6. R!f@@

    R!f@@ AAC Fanatic!

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    there is a 60W amp at tht site.
    Did you not find it?
  7. kubeek

    kubeek AAC Fanatic!

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    Ok, 30-50W is a nice number, but...
    50W per channel or total?
    How many channels?
    50W for what load impedance - 2, 4, 6, 8, 16 ohms?

    Answer ALL those questions, then it is possible to talk about the actual design.
  8. bertus

    bertus Administrator Staff Member

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  9. R!f@@

    R!f@@ AAC Fanatic!

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  10. abdus

    abdus Thread Starter New Member

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    50W total.but need to design a class AB amplifier
    8 or 16 ohms load impedence
  11. kubeek

    kubeek AAC Fanatic!

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    25W into 8ohms -> peak voltage is sqrt(25*8*2)=20V
    Depending on the output stage, the rails should be about 25-30V.
    average current for one channel at full load is 14.1/8=1.8A, peak current 2.5A

    The transformer for the power supply should be about 2x20V@2A, that is 80W to be on the safe side, could be a bit less powerful if you don't plan to use it at full power all the time.

    The westhost amp looks nice, but be sure to use the circuit 1a, not the first one.
    PSU smoothing caps nedd to be rated for 50V, at least 4700uF each, but more is better.

    The 10ohm resistor and 100nF cap on the output should be rated for higher current, I would use at least 2W resistor and a quality film capacitor rated for 50 or 63V at least.
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