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)
-1
votes
0answers
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, ...
1
vote
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
votes
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 ...
0
votes
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
votes
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 ...
0
votes
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
votes
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 ...
-1
votes
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
votes
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 ...
0
votes
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
votes
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
vote
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 ...
0
votes
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% ...
-4
votes
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
votes
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-...
0
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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
votes
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 ...
0
votes
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
votes
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
votes
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 ...
-1
votes
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
votes
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
votes
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
votes
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
votes
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
vote
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 ...
-2
votes
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
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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
votes
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 ...
1
vote
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
votes
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 ...
-5
votes
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
votes
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
votes
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
votes
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
vote
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
votes
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
votes
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
votes
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
votes
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 ...
-2
votes
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 ...
