Questions tagged [class-ab]
This tag can be used to denote questions related to analogue amplifiers working in AB-mode.
13
questions
2
votes
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 ...
1
vote
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
votes
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
vote
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
vote
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
vote
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
vote
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
votes
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.
1
vote
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.
1
vote
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
votes
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.
...
1
vote
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 ...
