Hello thanks for your replies.The circuit need at least two modifications to come closer to a useable AB amplifier.
- replace R2 by a diodes respectively a transistor with voltage divider ("variable diode").
- replace R4 by a bootstrap circuit (two resistors and a capacitor)
Thanks for the reply and yes you're right. i was doing the class b output stage by eliminating the R2 that's why it is missing.You have a resistor missing and a transistor upside down.
The input is connected to the wrong spot.
thanks for your informative reply. for the non-feedback circuits what specs do i consider thenYou measure a different voltage than shown on the simulation because a simulation "selects" certain specs for the transistors that are different to most transistors. Transistors have a range of specs because some are minimum, some are typical and some are maximum, even if they have the same part number.
Your circuit is missing the AC and DC negative feedback used in all amplifier circuits that allows a circuit to work perfectly without "selecting" transistors with certain specs.
Your circuit without DC negative feedback also works very poorly or does not work unless its supply voltage is a certain voltage. It will work perfectly at many supply voltages if it has DC negative feedback.
AC negative feedback can reduce awful sounding 5% distortion to distortion that is so small that it cannot be heard and is difficult to measure.
Difference between LTspice simulation and real hardware? If so, simply consider difference between models and real transistors in terms of Vbe and current gain.Could you make a comment about the output voltage bias namely i found it should be 7.87V but i measure it as 9.31V why is that?
To get maximum voltage (That is supply voltage) at the node below your high side NPN, you must apply supply voltage to the bias terminal. That is the way to make the transistor conduct maximum current.Also i want to determine the voltage swing boundaries but i dont know how to do that what would be the procedure?
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