Questions tagged [class-ab]

This tag can be used to denote questions related to analogue amplifiers working in AB-mode.

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4answers
566 views

Design a class AB audio amplifier

I am required to design a class AB audio amplifier to deliver 10W to an 8Ω speaker as shown, but I don't know where to start. The bandwidth is to cover the range from 20Hz to 18kHz. Input voltage is ...
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2answers
65 views

What is the role of the Op-Amp integrator in this circuit?

Helo dier community! I got a 400 Hz broken Power Inverter and reverse-engineered the circuit just for the simplicity of repairing it. Then I got deeper in and started to understand the engineering ...
3
votes
3answers
255 views

What do these components of an AB amplifier do?

I'm trying to learn about class AB amplifiers by reverse-engineering a few I see here on SE. I borrowed this schematic from this question as a starting place. Ignoring the fact that the circuit lacks ...
3
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1answer
50 views

How is the quiescent current and emmiter resistor determined on the driver and pre-drivers of a class-AB audio amplifier output stage

I am reading online about discrete audio amplifiers. I have learned about the input differential pair, the voltage amplifier stage, and now I'm learning about the output stage. I have learned that you ...
1
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1answer
64 views

Cross coupled Class AB output stage

A simple question about ClassAB common source amplifier. There are two circuits which I have attached with this question, the one on the left is a standard cross coupled circuit which I have taken ...
1
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1answer
57 views

How do analyze input impedance of Class AB amplifier biased with resistors?

EDIT: I realize that the original circuit is deeply flawed and will burn up upon re-entry. Thanks to anyone who can help me understand why! I'm learning to analyze Class AB amplifiers, but haven't ...
1
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1answer
39 views

What equation do I use for simple class AB input impedence?

I'm a novice at this. I've done some figuring and would love to know if I've got this correct before I move to more complicated circuits. I have the simplest Class AB amplifier and I'd like to know ...
1
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3answers
101 views

Amplifier power problems, power supply limitations, or end stage base current draw

So I am experimenting with various signal generating, op-amp and power amplifier circuits. And I have limited access to technology. Where I am at, everything you buy is twice the price because of ...
0
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3answers
84 views

How can I overcome the distortion using in this circuit by using same products as we see in picture ? Or we can use 2n700 series, 3906 and 3904 bjts

Or we can use 2n700 series, 3906 and 3904 bjts. My aim is 10W, gain 100-1000 (adjustable), 50hz-20khz amplifier by using this basic components.
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1answer
58 views

How can I calculate low and high frequency in my circuit?

How can I calculate low and high frequency in my circuit? I have used an 8-ohm speaker.
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1answer
148 views

LTSpice produces incorrect simulation for Class AB amplifier

I have been building a Class AB amplifier simulation using LTSpice. While it simulates well for transient analysis (voltage gain of 0.9 at peak), using ac analysis the the voltage gain drops to 0.268....
0
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1answer
181 views

Class AB Amplifier - Q point

In a class AB amplifier, why is the Q point much closer to the cutoff voltage as compared to a Class A amplifier which is at the center. Wouldn't this clip the AC signal if its too close to Vce. ...
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2answers
90 views

Two-stages class AB amplifier

I'm studying the following two-stages class AB amplifier: Basically it is a standard two-stages op-amp (i.e. the cascade of a differential pair with active current mirror followed by an inverter with ...