All Questions
Tagged withamplifier
operational-amplifier
639 questions
0
votes
1answer
45 views
what nV/rtHz means in the context of signal resolution?
From what I have done so far, V/rtHz is a form of expression for the amount of noise in a bandwidth. How ever, I came across this paper where they mention the minimum resolution of a signal (in table ...
0
votes
1answer
100 views
Headphone amplifier is humming
I have built headphone amplifier kit and connected it to the output of DVD player. It works but I can hear humming. The humming is present only when DVD is connected. There is no groundig of the boxes ...
0
votes
4answers
187 views
TL071 doesn't work like a generic op-amp
I am trying to use the TL071 for a project. I run my simulations on Proteus. After I ran the simulations and verified the circuit behaves as I want, I ordered the parts and put the circuit together. ...
0
votes
2answers
106 views
TL071 does not integrate my sine wave
I want to make a homemade function generator. I used a Wien-bridge oscillator with a UA741 to produce the sine wave, amplify it with another UA741 because it has quite low amplitude, then integrate it ...
0
votes
2answers
121 views
How could I build an amplifier circuit that can take an input voltage of 0-0.7V and amplify to 0-32V, 1 ampere, that works for 100 MHz?
A little background first. I am trying to build a pretty dumb project where I try to take a VGA input and display it in a manner similar to a Nipkow disk. The high frequency RGB signals need to be ...
3
votes
2answers
131 views
Electret Microphone Pre-Amplifier capacitor
I'm building a preamp for an electret microphone, it's fairly similar to the pic below but values are a bit different. I'm wondering about the output cap, can it be increased without boundaries ...
0
votes
2answers
39 views
OP2177 opamp with single supply
Does anyone know if I can use "OP2177" with a single supply without a negative voltage on V- ?
0
votes
3answers
53 views
How are potentiometers connected in an amplifier gain circuit?
I am trying to understand the circuit below. Please look at the highlighted circle, Imagine that the potentiometer has 3 pins namely, A, B, and C. If A is connected to -ve inverting input of the op-...
5
votes
1answer
83 views
A simple analog neural network to implement the XOR operation
I am reading this paper and wanted to replicate some of the results as part of a learning process. I'm more of a digital guy but obviously have had some analog design as part of my studies. ...
1
vote
1answer
91 views
Operational Amplifier Output Stage Biasing
I am trying to bias my op-amp output stage using diodes. I am using a current source for the bias current but later I will replace it with BJT current source. However, it doesn't seem to work. ...
0
votes
3answers
47 views
Op-Amp circuit output analysis trouble
What is the output voltage Vo of the OPAMP circuit given below? Attempt at solution: THE ANSWER IS GIVEN: 6V, but according to me as the positive terminal is grounded the negative terminal will be ...
2
votes
1answer
72 views
Op_Amp as an integrator
[ I designed a simple op amp and now I am trying to make it work as an integrator as shown in image 1. The output voltage waveform looks fine for a sine input as I am getting negative cosine as shown ...
0
votes
0answers
66 views
Op-Amp not working as a integrator
I designed a simple 2 stage op amp. Now I am trying to make it work as an integrator as shown in image 1. The frequency response as shown in image 2 is as expected and I am operating between the ...
0
votes
3answers
166 views
Need help designing an operational amplifier circuit
I am trying to design an operational amplifier with a gain of more than 200000. My first stage is a differential amplifier with an active load. I am getting a gain of about 1900 from it. Second stage ...
0
votes
1answer
68 views
Stereo channel strip based on NE5532
I want to build a stereo channel strip, using the NE5532 IC. It should feature 2 mono inputs with volume control, mute switch and pan control going to a stereo output with unity gain. In the schematic ...
