Questions tagged [amplifier]

An amplifier can be used to adapt the range of the signal to a requirement, to make it more robust for transmission, or to satisfy interface requirement (like input/output impedance)

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Why do audio amplifiers have many capacitors in rows?

In this video, there are two main rows of capacitors on a Class D audio amplifier. I understand the power supplies need power filter capacitors, and that output stages need DC decoupling capacitors. ...
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-3 votes
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Help needed in project [closed]

Greetings fellow electrical engineers, it is requested to explain how to design this circuit. Can it be done via MOSFET or should it be done without a MOSFET? If it can be done with a MOSFET, how?
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Discrepancy in theoretical vs measured gainbandwidth in LTSPICE ideal OTA

I am using a very simple model to show the unity gainbandwidth of a closed loop sample and hold with a closed loop gain of 2. One would expect an ideal OTA to have a GBW independent of rout as GBW is ...
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Which are better and more accurate alternatives to LMV324 by Texas Instruments? [closed]

I need LMV324 form my electronics circuit, but it is not available in India, and someone said there are more accurate quad amplifiers available than this. Can someone tell more quad amplifiers with ...
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-3 votes
1 answer
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Isolated amplifier with a gain of 1 [closed]

I am looking for an isolated amplifier (3kV dielectric strength minimum) with a gain of 1 which will be used to convert a 0-5V input to the same isolated 0-5V output. I know I could use a resistor ...
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2 votes
1 answer
124 views

Which variant of amplifier to use?

I am making a pressure sensor circuit according to page ten of the manual here. There are just too many types of the recommended sensor LMV324 available in the SOIC type. Can someone help me decide ...
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Op-amp exercise [closed]

R1 = 6,8kohm R5 = 470ohm R10 = 1,8kohm Hello, I'm having trouble to find the gain of this circuit. I know that U1 and U2 act as buffers and the output from both op-amps are vid. I've tried to find the ...
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Calculating SPL in octaves from .wav file recorded with microphone in Python

I made a recording of my environment with a microphone with the following specs: The recording has a sample rate of 44.1 kHz and a bit depth of 16. I use: y, sr = librosa.load(latest_file, sr = 44100)...
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2 answers
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GPD2846A mp3 module with headphones?

The GDP2846A module has an in-built 2W amplifier which is fine for a small speaker but not for a pair of headphones as it is indeed way too much. I've thought of directly taking the DAC outputs (...
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40 views

Drop in Amplifier High Frequency Gain without Large Power Capacitors

I have designed a simple class AB audio amplifier circuit which can be seen below. I am simulating the amplifier and have used a single, 100uF capacitor for C3 and C4. The simulation is being run ...
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I don't understand JFET/this diagram Associate CET study guide

0 I need help understanding JFET amplifier circuit I have a lot of questions that maybe basic questions I'm sorry. This is a N-channel Jfet so it has negative voltage but what does that even mean “...
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How to find noise sources from noise figure data?

An amplifier datasheet provides noise measurements that show it has a noise figure of 3dB for R_s = 100Ω and R_s = 10kΩ (same noise figure for both values of R_s) at T=300K and f=10kHz. I need to ...
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5 answers
128 views

How can negative feedback reduce distortion if A*beta>>1?

I have read that negative feedback reduces distortion (frequency, amplitude, phase) because if \$A \times beta >>1\$ the transfer gain will be \$(A/(1+A*beta)) = A/A \times beta=1/beta\$. Which ...
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1 vote
2 answers
48 views

LTspice-RIAA-simulation not working out

I'm trying to simulate a RIAA-phonograph-preamp since I want to build a phono-preamp. I've built everything according to the data provided by LT for the LT1115. But my simulation seems to not be ...
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1 vote
1 answer
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How do I compute the power consumption of an audio amplifier?

I intend to use this audio amplifier in my project : PAM8019 It has two analog inputs : left channel and right channel. It has two analog ouputs, which are the amplified inputs. Let's say I follow the ...
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1 answer
32 views

How to disable Bluetooth temporarily for line in to work in mini hifi amplifier TDA7492P? [closed]

The TDA7492P, a mini hifi amplifier with Bluetooth and line in does not allow line in, it jumps to Bluetooth soon after the start and blocks the line in signal. It goes like this: Power on line in. ...
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Output reflection coefficient of a power amplifier

I'm struggling to understand the implication of a poor large signal reflection coefficient at the output of a power amplifier. I designed a power amplifier and checked the large signal S22 (for the ...
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1 answer
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IR remote code amplifier

I am interested in amplifying output mod signal of my tv remote in order to use a higher power led/vcsel. Now, it should be as simple as cutting the emitter led and putting a transistor that would ...
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0 answers
44 views

Passive equalizer design

I have circuit feeded from a 3.5 mm jack through a JFET common-drain buffer then i need the filter this audio input to pass bandwith 400-19600 Hz. I can do this with RC bandpass filter but then I need ...
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MPQ3904 LTSPICE Model

I'm trying to do some LTSPICE simulations using a MPQ3904 NPN BJT. Of course this specific model is not in the LTSPICE library. I tried to look up possible models online but I can't find anything. The ...
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Isolate digital switching from audio circuit

I'm using an L298 H-Bridge to drive a DC motor. The motor is spinning a magnet across a guitar pickup at ~30 Hz. That signal is then amplified and sent to a speaker. However, the output signal also ...
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2 answers
119 views

Does anyone know why this diff amp isn't working?

simulate this circuit – Schematic created using CircuitLab I'm new to electronics and I've been figuring out how a diff amp works. I followed a schematic I found on YouTube. Basically, as V3 ...
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2 votes
2 answers
67 views

How does the common emitter configuration offer higher output impedance?

I know that the base-collector region is reverse biased and because of that it offers high resistance but it is the resistance due to biasing. In a video, the person was explaining the hybrid-pi model ...
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Where To Connect Wires on Pin Out

I am very inexperienced in wiring. Where do I connect the wires from my trans-impedance amplifier to my DAQ to measure the voltage out and also to apply a voltage. I don't understand why there are ...
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4 votes
0 answers
86 views

How to properly couple DC in this biased headphone amplifier design on power-up?

I am a self-study noob to electronics (and audio electronics) but diligently learning every day :) Some things I understand well, others I'm fuzzy on. This device is a headphone amplifier using NE5532 ...
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2 answers
81 views

Where can I find large thru-hole heatsinks like this? [closed]

I'm doing a project with an OPA541 amplifier, and I need to find a heatsink similar to the one in the pictures: But I only found small ones with a screw hole and legs for soldering, none of the large ...
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0 answers
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Current Shunt Amplifier Problem (MAX49921)

I'm currently trying out the evaluation kit for the MAX49921 from Maxim, and I'm having a few problems with it. First thing to note is that my board appears to be an issue a board, but all the ...
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2 answers
65 views

Picking up ultrasonic signals on a hydrophone

I bought two Aquarian H2A (3.5mm version, not XLR) hydrophones for receiving faint ultrasonic signals (29 KHz) being generated by an underwater sensor node. I am running into some issues. I tried to ...
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0 votes
1 answer
56 views

Does an amplifier consume any power when nothing is connected? (GPD2846A built-in 2W amplifier) [closed]

The GPD2846A module has a built-in amplifier into it. However, I want to use it with my headphones which don't require 1-2W (they are definitely going to distort sound and possibly be damaged). So I ...
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7 votes
5 answers
402 views

Amplifier with selectable inversion?

Two inputs: Signal: 0-5 volt analog voltage Direction: Standard TTL logic Output: A single analog voltage from -10 to +10 volts When Direction is low, the Signal is amplified and inverted, so that ...
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1 vote
0 answers
61 views

Class AB RF Amplifier with only one active device

I'm designing an amplifier for the 420-440MHz band. I'm looking at using the following part from Ampleon: BLP15H9S100. I'm new to doing RF amplifier work and I've been going through the design process ...
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-1 votes
1 answer
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The output of PI controller using opamp is not working [closed]

I am designing a closed loop system for dc-dc converter for that I am using error amplifier and pi controller. For error amplifier and PI controller I am using OP177A opamp. The error amplifier ...
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1 vote
1 answer
35 views

PSRR of an amp + ADC input stage

I have an input stage that consists of an amplifier then an ADC. The op-amp and ADC are powered by Buck voltage regulators. I want to measure the PSRR of this stage, so I am planning on breaking the ...
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0 answers
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How to wire a dynamic mono microphone with PAM8610 stereo audio amplifier

I am trying to make a audio amplifier with PAM8610. I have a dynamic mono microphone. In the PAM8610 official file they say that "To use the PAM8610 with a single-ended source, acground the INP ...
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0 votes
2 answers
76 views

What would the output impedance of the circuit below be?

My analysis is as follows, the auxiliary amplifier with input Vb is being used to sample the output current of the main amplifier (NMOS on the bottom) and return a voltage to its gate. So it is ...
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4 votes
1 answer
501 views

Is it possible to use CRT tubes for audio amplification?

I was wondering if it's possible for me to use the tubes in an old CRT TV to build an audio amp (specifically a guitar amp). If not, would I be able to salvage something else (like an old radio) to ...
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-2 votes
2 answers
69 views

How to add harmonic distortions to guitar amp? [closed]

I was reading about the carver challenge,(https://www.stereophile.com/content/carver-challenge) and read that he had added a series of potentiometers to one of his amps that had allowed him to ...
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0 votes
0 answers
41 views

Common emitter amplifier with low impedance

The following schematic shows a common emitter amplifier driving a resistive load. The common emitter has a high output impedance, is it possible to use the amplification achieved with the common ...
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1 vote
1 answer
119 views

How to calculate the output resistance of the CE amplifier, which has only a coil in its collector?

In order to be able to match the impedance, it is necessary to know the output resistance of the amplifier. In radio frequency amplifier circuits, there is usually a coil in the collector instead of a ...
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2 votes
4 answers
168 views

I'm desiging a class AB amplifier with class A preamp, what are the problems with my design?

I'm attempting to design a class AB guitar amplifier with a class A preamp. I'm a novice and this is the first actual project I'm attempting. What are the possible caveats, as well as my choice in ...
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4 votes
2 answers
160 views

Electrical amplification of 10ns pulses without "ringing"

I have an expensive arbitrary waveform generator (AWG) that can create very clean arbitrary pulses. I am producing gaussian pulses from this AWG that are about 10ns wide, which look like this on a ...
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0 votes
1 answer
80 views

Three stage BJT Amplifier

I'm working with a three-stage BJT amplifier that takes an input from a DAC with a full-scale output voltage of 0-2.5V. I've been told from probing the output the gain is somewhere around 100. I was ...
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2 votes
2 answers
78 views

Bidirectional voltage-to-current converter

How to make the following voltage-to-current converter bidirectional, so that bidirectional current can be driven through the load?
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-1 votes
2 answers
37 views

What is the recommended Amplifier/Receiver (AVR) for my Surround Sound 5.1 Speakers Configuration?

Here are my speakers & subwoofer configurations, wondering if anyone can help me suggest a minimum AVR configuration I should go with: I am looking at Harman/Kardon or Denon AVRs. Little back ...
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0 answers
37 views

voltage amplifier design feed by current source

I want to connect electret microphone with long wire to receiver. Usual way is to use balance line technology, but it can be expensive, then I've opted to use CCLD Constant Current Line Drive ...
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3 votes
1 answer
676 views

Headphone output - what is the function of these resistors going to ground between the decoupling capacitors and headphones

The Korg Monotron Duo synth uses the TPA6111A2 headphone amp. The circuit they use is largely the same as the one from the datasheet - except for R78, the 470ohm resistor going to ground right after ...
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2 votes
2 answers
105 views

What would be the amplification circuit for PP02 sensor using LM324 pressure sensor?

I am planning to use the PP02 Omron pressure sensor. The user manual of the sensor (Usermanual link) suggests using LMV324 type of instrumentational amplifier with four op amps within in the schematic ...
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4 votes
1 answer
244 views

What is the advantage of servoing instead of directly measure?

I was looking at the LT6118 datasheet, since the TI amps (like te INA381) I am used to are not available. They mostly do the same thing, and probably are intended as direct competitors, IMHO. The job ...
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7 votes
1 answer
1k views

Having a hard time identifying this component; maybe the logo can help

Does anyone have any idea what this part Q6 is? It appears to be some type of SOIC 8 FET. Logo on the device:
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0 answers
55 views

Package & Variable Gain Amplifier Identification

I am trying to identify an unknown wideband VGA whose markings were scratched off. It is apparently a 5W amplifier, drawing 1A @ 5V power supply, with analog gain control - using a 10k potentiometer. ...
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