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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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45 views

Can't figure out how book on Trannys gets hfe of CE amplifier when using T-Equivalent and Hybrid Pi Circuits

So I'm reading through it and doing all trhe problems as I have done with 20+ other books like this. The author says this a lot "Although the transformations are quite straightforward mathematically, ...
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1answer
36 views

CD4011 Oscillator Square Wave Output Fed to Transistor Audio Amplifier; Volume Control Question

I built an audio frequency square wave oscillator using 3 gates on a CD4011 quad NAND gate IC. I then fed the output of the oscillator (pin 11) to a very basic "push-pull" transistor amplifier on the ...
3
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1answer
129 views

Reverse engineering old record player schematic

So this is a loaded question I know, but I'm stuck and I don't know where to go from here... My mom has a super old record player. It's build into a bright orange suitcase which is pretty cool. We ...
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0answers
28 views

Reusing speakers from an old laptop: how to amplify them? [on hold]

I would like to reuse two pair of speakers got from an old ASUS 1201T laptop. Since I don't know the specifications of the speakers, I looked in the datasheet of the Realtek ALC269 sound card and ...
0
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2answers
40 views

Circuit Choices for AmpIifier Input

i have breadboarded a TDA2050 amplifier, using this schematic i get good sound intensity with a half acceptable quality. the down side is the constant noise and humming. i have found a possible ...
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0answers
65 views

I cannot figure out what kind of transformer this is [on hold]

So I was told this is from a welder but I would like to us it for fractial wood burning but I cannot figure out what kind of transformer it is and how to do it, all the videos use microwave ...
0
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2answers
52 views

How to mount four 6-wire 10V load cells on Arduino or Raspberry Pi?

I want to connect four 6-wire load cells (Tedea Huntleigh Compression & Tension Load Cell 300kg, 15V dc, IP67, product page and datasheet) into an Arduino or Raspberry Pi and get four independent ...
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0answers
37 views

How many bulb and Fan will run in 3AMP light? [on hold]

In 2BHK flat, How many bulb and Fan will run smoothly. Is there any way to check?
4
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2answers
2k views

I found an audio circuit and I built it just fine, but I find it a bit too quiet. How do I amplify the output so that it is a bit louder?

I want to try something audio related and found the following circuit from technoblogy I built it and loaded a sound clip. Everything works fine, but I found it a bit too quiet and I want to amplify ...
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0answers
44 views

Distortion via Powered Speakers and not in Headphones - 1 Transistor Amplifier

I'm trying to make this NPN amplifier circuit work for my battery powered computer speakers. This circuit works fine if i connect headphones to it in output, but has distortion when connected to a ...
0
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1answer
34 views

Why does the output voltage of my linear gain amplifier depend on the JFET gate voltage?

I am trying to build a linear gain voltage controlled amplifier using an N-channel JFET as a voltage variable resistor (see circuit below). As the circuit is set op now, I would expect Vout to be ...
1
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1answer
41 views

HFA3096 transistor array breakdown voltage

In the book Learning the Art of Electronics, one of the labs is to build a differential amplifier with a CA3096 transistor array. The author admits that the chip may be difficult to find and gives the ...
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4answers
68 views

Op Amp: signal measurement that is below its common mode input range

I was wondering, how is possible to use an op amp, which its common mode input voltage is (V-) + 0.2V to (V+) - 0.2V to measure signals as low as 10mV for example? I'm looking for an ...
2
votes
1answer
52 views

Measuring integrated current

I want to measure the amount of light striking a photodiode in a specific time window (about 1ms). In this window, we get \$10^6-10^7\$ photons, which get converted into electrons with about 80% ...
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0answers
46 views

Old tube amp from a Baldwin organ [closed]

Hello to all and thanks in advance for any help .. ok well I have this tube amp its complete I have everything out of the unit .. I'm very curious about making this I to an audio amp for my home ...
0
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1answer
57 views

Class D Amp headphones grounding circuit

I am having a problem with some of the class d amps I've played with (PAM8302A), and it seems like this article here describes my problem: https://www.edn.com/design/analog/4313726/Add-headphones-to-...
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1answer
47 views

MONO output from STEREO amp (T-Class)

I have ONE Boston Acoustics Micro90X Speaker (for 15-125 watt amps), and a Topping VX1 2x25W Class T Amplifier (notionally 2 x 25 watts) that I don't currently use. I thought both of these gave ...
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0answers
24 views

Unbalance effect in differential amplifier

Consider we have the below differential amplifier : Consider that the two resistors R2 are not balanced and the unbalance in this resistors is represented by delta R2. The common mode rejection ...
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0answers
19 views

Calculate Capacitor mf for PAM8402 Amp Powered From RPi

Trying to figure out what capacitor mf I should use for a 5v PAM8402 audio amp that is powered by a Raspberry Pi. When the amp is first turned on it triggers the Pi's low voltage warning. I'm using a ...
0
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0answers
31 views

LM4890 amplifier and CR1616, how to improve power consumption?

I'm a hobbyst trying to design a simple circuit for amplifying the PWM audio output of an ATTINY85. I'm using an LM4890 (1W amp) and a 1W microspeaker. The problem comes when I supply 3V with a small ...
2
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1answer
49 views

Variable gain amplifier output appears on circuit positive and negative supplies

I am trying to use the analog devices AD600 in a simple sonar system. However, the performance of the chip is severely degraded because whenever the chip's output is nonzero, a portion of that output ...
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0answers
36 views

Three level PWM modulator circuit feedback simulation

I'm trying to design a three level PWM circuit with feedback and i'm struggling to understand the feedback aspect. The design is based on this design by Texas instruments and modified to suit three ...
0
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1answer
92 views

Isolated High Voltage Amplifier Idea

Test laboratory of our factory asked me to design an isolated high voltage amplifier. Here are the requirements: The circuit will be built with transistors and passive components in the lab. (No IC ...
0
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1answer
51 views

How can a guy calculate the second collector current from this circuit?

This is an audio amp that we built for a project. I can easily find the first collector current from the first transistor by multiplying it with its Beta(200) and since the first transistor is beta ...
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1answer
57 views

Audio amplifier using LM386L

I am a student and I am trying to build an audio amplifier. I wanted to ask if there's any way to replace capacitors with different (some in pF). If it could be possible, let me know. I'm using 9V ...
2
votes
1answer
63 views

How to measure 0.02V to 0.18V audio signal with arduino?

I have a Sony STR-DE845 home theater amplifier with 8 Ohm speakers. I want to measure the voltage sent to the speakers to infer their volume using an Arduino. The AC voltage measured across a speaker ...
4
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2answers
174 views

DC input on op amp integrator

I am trying to integrate a DC tension with a classic op amp integrator. The problem is : when I simulate my circuit on LT Spice, the output will always be equal to the VEE tension of the op amp ...
0
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1answer
83 views

amplifier for 10V LED dimmer control using Raspberry Pi

My problem is I need to have an amplifier circuit design - schematic + components BOM with specific model information that is able to provide a dimmable output signal (Vout) 0.2-10V <0.8A for a set ...
20
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2answers
3k views

What's the purpose of these copper coils with resistors inside them in A Yamaha RX-V396RDS amplifier?

This is an bit of an overly specific question, but I'm curious about the purpose of these coils inside a Yamaha RX-V396RDS amplifier and wondered if anyone could explain what they're for. They appear ...
0
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0answers
35 views

Merging audio lines - one channel is quieter

I'm still learning digital electronics, and analogue electronics is very much a dark art for me. I have the circuit as shown below, the audio output stage for an 8-bit programmable sound generator. ...
1
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1answer
41 views

Replacing elements in a tube amplifier

I assembled a tube amplifier.According to the specified scheme (Old Russian radio "Record 66"). 1.What is the function of capacitors C9 and C8 ? 2.What will change the capacity of these parts? Will ...
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2answers
50 views

Connect three different power sources [closed]

If I connect between three power sources, first one: 220vac 700ma , the second and the third: 12vac 500ma, what is the voltage and current result (I need just increase the current) ??? The power ...
0
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3answers
62 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 ...
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0answers
28 views

Speaker crossover: can wrong ESR cause amplifier to clip?

I have an old pair of speaker I decided to revive. I recapped the crossover with new caps but now my amp keeps clipping when I turn the volume a little bit high (and it was not before). I wonder if ...
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0answers
15 views

EC Sensor (Analysing the Circuit)

I'm doing an electrical conductivity sensor; my goal is to build a water monitoring device. After analysis I decided to build my own circuit and make some improvements to other designs. An EC sensor ...
0
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1answer
57 views

(Antenna impedance matching) How to find the load impedance

I'm working on a project that requires impedance matching and I'm going to match a 50 Ω antenna to a RF amplifier SST12LP22. However, I'm not sure how can I get the impedance of the amplifier from the ...
0
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1answer
36 views

Tail resistor in differential gain

Why doesn't the tail resistor feature in the denominator for differential gain (whereas it does for common mode gain) in the differential amplifier below? (Fig 5N.28 from Learning the Art of ...
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2answers
84 views

Analog Isolation Question

There appears to be several options out there when it comes to isolating analog signals. This topic has been addressed on this website in a few forums as well. The problem for someone such as myself....
0
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1answer
27 views

Latch-based sense amplifier design using CADENCE Virtuoso 65 nm technology

I am trying to design a latch-based sense amplifier to sense about 55mV voltage difference using 65nm technolgy, it takes differential input, and should get from it differential output too where it ...
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1answer
40 views

I need a conditioning circuit for audio signal for input of microcontroller 3Vdd power supply and voltage reference? [closed]

what is the Best circuit to amplify and condition a audio signal from a microphone to microcontroller analog input ?
0
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1answer
55 views

Amplifing the output of a current transformer sensor [closed]

I have to make a current transformer sensor from scratch for one of my projects this semester. I bought a torroid ferrite core and wrapped a copper wire around it. Plan was to thread a wire as the ...
0
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0answers
50 views

Single supply AB class amplifier

I wished to know if there is a way to use an ab class amplifier without a double power supply or, alternatively a way to get dual voltage supply without a center tapped transformer
0
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0answers
49 views

How to build a DC push-pull voltage amplifier with transistors?

I have a digital 3.3V PWM signal that I want to send to a speaker, i.e. amplify to higher voltage (e.g. 12V, but not sure) and remove DC offset with a capacitor. For the capacitor to work as ...
0
votes
1answer
34 views

Common Emitter Stage BJT Amplifier with Early Effect Inclusion

How can I find Rin, Rout and Gm parameters of a BJT amplifier in common emitter stage without neglecting Early Effect? We have such homework and I couldn't find the exact same example in Behzad ...
1
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0answers
92 views

How to make a guitar amp switcher?

So I'm trying to build a guitar amp switcher (and I don't really know what I'm doing =)). The idea is that guitar out is connected to X4 jack and then switched to either X1, X2 or X3 jack, which ...
0
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1answer
28 views

Battery wiring for DIY speaker question

could anyone tell me if i can wire the 12V battery to get around 20V out of the whole set? Right now it's wired in parallel which increases capacity but i need around 20V for the amplifier to have ...
0
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0answers
23 views

Tda2822 audio amplifier used for mono signal

I have a signal from an astable connected to 9V which I want to amplify using the TBA2822 amp. The speaker I want to amplify the signal for is 8 ohms impedance and 2 W power. Since the signal I have ...
2
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0answers
55 views

D-Class Amplifier Design Verification

I have an internship coming up working with comparators and amplifiers, so I wanted to take on a side project involving both of those components. Designing a D-Class amplifier seemed like a great way ...
0
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1answer
30 views

Impulse Response EEG Amplifier

We need to measure the impulse response of the EEG amplifier we use in our lab. We don't have so much equipment but, luckily, we have a pulse generator for delivering small electrical pulses with a ...
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0answers
71 views

I want to amplify my phone headphone output signal to drive a 2watt 4 ohm speaker at its highest performance

I want to amplify my phone headphone output signal to drive a 2watt 4 ohm speaker at its highest performance. Does anyone know standard TRS output signal characteristics ( source impedence and ...