Questions tagged [class-b-amplifier]

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0
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0answers
30 views

Can I use BTL audio amplifier IC in single-ended output configuration?

I am designing a widget that has to have a speaker output (low power, between 1W and 2W, 8 Ohms, low-quality) with the limitation that one end of the speaker must be grounded. There are lots of audio ...
4
votes
1answer
70 views

How can I minimise the power consumption of this crossover clipping circuit?

I am trying to produce a circuit that produces crossover clipping distortion for musical purposes (to sound like a crappy old transistor radio). The problem I am running into (among a few, but to ...
0
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1answer
221 views

How do calculate / determine the reference voltage for the error amplifier of my analog PWM generator for a 0-100% duty cycle

For a school project I am building an analog PWM generator with 0.1 to full-scale linearity and a duty cycle 0-100%. Powersupply is 5 Volt and 100% is equal to 5V at the output. The frequency 1 Khz. ...
0
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3answers
66 views

Does this still count as a class B amplifier?

The PNP's emitter terminal is grounded instead of the collector terminal. is the formula:Pi= (Vcc)(Vout peak)/(pi*loadResistance) still applicable for this?... the out put has crossover distortion ...
-3
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2answers
811 views

power for the load in push-pull amplifier

I wanted to ask: what is the power needed for the load resistor? Is there any problem? and what might be the solution for it? I really appreciate you help, thank you!
0
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1answer
36 views

Current waveform in Class B amplifier

For a class B amplifier which has a LC filter at the output, gives Pure sinusoidal Voltage and current waveforms. But if we check back the waveform at Drain, waveform for drain current remains clipped ...
9
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6answers
2k views

Difficulties with Class B Amplifier Biasing

Here I am referring to class B output power amplifier. This circuit should be easy to build and understand but I'm having problems with biasing since I don't really know how to bias the bases of Q1 ...
0
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1answer
404 views

Impedance of an Electret Mic

I have an electret mic for the design of an audio amplifier using input and output stages. How can I measure the impedance of that mic?
4
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2answers
1k views

Confusion between Class B and Class AB Amplifier

I am reading about output stages of an amplifier and classes of amplifier. The following circuit is named as "Class B" amplifier. From my understanding, the above circuit should be a class AB ...
6
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3answers
438 views

Highly Distorted Output of Class B Power Amplifier

This is the circuit I made: simulate this circuit – Schematic created using CircuitLab This simple circuit incorporates differential stage - VA (Voltage-amplification) stage - OPS (Output ...
3
votes
1answer
3k views

How to determine current limiting resistor values for push pull amplifier driven by op amp?

I'm looking to increase the output current drive of a high voltage op amp using a push pull amplifier. The OPA454 datasheet includes an application circuit to do exactly this, and includes some ...
2
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5answers
1k views

Design of a discrete BJT current buffer for low-current op amp

I built and simulated this BJT current buffer for an opamp based on examples I found in various places online: Link to simulation of above schematic It simulates fine, but I am pretty sure it will ...
9
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2answers
3k views

Input coupling to Class AB amp with diode bias. One capacitor or two?

When AC coupling the input signal to a Class AB (Push-Pull / Complementary Pair) which is diode biased I see two different approaches: Signal connected between biasing diodes with single decoupling ...
2
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3answers
4k views

How does this Push-Pull amplifier work?

I'm reading about op-amp circuits that use negative feedback from this article (question no.19). What confuses me is that the negative feedback for the Op-amp (which is being used to reduce ...
1
vote
0answers
960 views

FET Push-Pull Amplifier

I'm curious about JFET/MOSFET circuit B class amplifier. When BJT is used we only have those (+/-)0.7V limiting the transistors and causing crossover distortion. But with adding FETs or MOSFETs to the ...
2
votes
2answers
902 views

Understanding harmonics of different Amplifier Circuits (A,AB,AB w/OP-Amp)

I have been test the circuits for amplifiers and got somewhat stuck in understanding the results for the FFT's harmonics. With a standard type B I was able to get this graph for the harmonics for ...
5
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1answer
3k views

use of diodes and resistors in a push-pull amplifier

I am a beginner in electronics facing a bit more difficult problem. what might be the function of the two resistors(R4,R5) and diodes(D1,D2)? in the circuit below?
0
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0answers
120 views

Amplifier for 100kHz magnetostrictive ultrasound emitter

I need an amplifier to drive an ultrasound emitter (inductive load, 120uH, 0.3 ohm). Single supply circuit would be preferable. Bandwidth - from 40 to 200kHz, output power 6-10W at 4 ohm load. The ...
2
votes
1answer
314 views

Class B power amplifier using only Nch FETs

I'm building a combined linear regulator/electronic load. When the output is lower than the supply Q3 acts as a linear regulator and when the load tries to pump power back the other way, Q6 acts like ...
0
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1answer
161 views

Calculation of Breakdown Voltage

How can we calculate the breakdown voltage of a BJT in ADS? Is it Possible or not in ADS? Problem:- I have a ADS BJT model. I am using that to generate high voltage output. For that i need to bias ...
0
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1answer
386 views

Getting rid of electrical noise produced when one touches amplifier and amplifier's dials

I purchased a Lepai LP-2020A+, which is a pretty good little amp for the price, but I've modified it to make it much better and decided it deserved a better casing to look the part, too. So I ...
1
vote
1answer
634 views

Class AB Amplifier Frequency Response

I have designed an AB Audio Amplifier, but even though the gain is acceptable, the frequency response is terrible.As seen in the schematic, there is a feedback/preamplifer stage and an output stage, I ...
10
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1answer
902 views

Class AB amplifier

What role does Rv play in this AB class amplifier?
3
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1answer
1k views

Problem with a class AB amp

I have a simple preamp circuit coupled with a class AB power amp. The design is quite simple and I am pretty sure I already made it work a couple of years ago. simulate this circuit – Schematic ...
0
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2answers
165 views

Class B power amplifier

In this circuit from (Grey,Meyer Analysis and Design of Analog Integrated circuits fifth edition) It is stated that : "In the quiescent condition,\$ V_o = 0\$ and \$V_1 = 0\$ ." What forces V1 and Vo ...
0
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1answer
550 views

Bias-setting on valve amplifier with dual negative bias supplies

This is a general question, although the immediate purpose is to apply it to a Thorens AZ-25 amplifier from the 1960s. Schematic is here. Push-pull valve (tube) amplifier output stages are generally ...