Questions tagged [non-inverting]
The non-inverting tag has no usage guidance.
128
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Non-inverting amplifier isn't amplifying my signal
I am using a non inverting amplifier (shown below). For the opamp, I am using TL084, and I am using 12V single supply. I am getting an output of 11.20Vdc even though the input is 1.06V sine wave. I ...
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4
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Why do you suppress the input when finding the output impedance of an opamp circuit?
In most derivations of the output impedance of an (non-ideal) non-inverting opamp circuit, the input terminal is grounded (e.g. page 5/6 here or page 76 here). It also seems to be a common procedure ...
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2
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How to calculate the gain of a non-inverting opamp with a transistor?
I have a question about this circuit. How do i rearrange the formula to calculate the voltage gain of this opamp with a transistor:
I know the formula for the gain of a non-inverting opamp like in ...
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2
votes
1
answer
113
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What will be the output of a single supply voltage follower circuit if negative voltage applied to the non-inverting input?
I am providing 1.8 V as supply in a single supply voltage follower circuit. Now my concern is if I put negative voltage (Range -1.3 V to -500 mV) in the non-inverting pin, what will the output from ...
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1
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Amplifier clipping output signal [closed]
I constructed a noninverting amplifier with a sine wave input (0.5 Vpp) and observed an output signal that was clipped equally in both the positive and negative regions, to about 2.5 Vpp. I tried to ...
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2
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1
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232
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Range of feedback resistor value in non-inverting op amp
Is there any limitation for the range of the feedback resistor in a non-inverting circuit? What happens if I choose feedback resistor very high or very low? What is wrong with choosing a 10M ohm ...
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2
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173
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How to make my signal square without using two MOSFETs (and inverting it twice?)
I am trying to extend an existing solution to decode a specific signal (solved here for 1200bps speed: http://hallard.me/demystifier-la-teleinfo/ - article in french.)
A 9600bps signal comes from a ...
- 111
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2
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72
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Design Methodology for Non-Inverting Summing Amp
I'm trying to design an op-amp circuit to sum up four voltages by using a non-inverting summing configuration. You can see it in the circuit below, though for illustration's sake, the resistor values ...
0
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1
answer
174
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Preventing op-amp outputs from affecting one another
I built this op-amp circuit that takes in 4 inputs and outputs 3 sums by using op-amp adder and difference circuits to achieve a gain of 2x. In a simplified circuit, I boiled it down to the bare op-...
4
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2
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TL071H unity gain buffer output voltage drops to zero when input near to zero
When the input voltage is smaller than 300 mV, the output voltage drops to almost zero.
When it is above 300mV, the output follows the input.
Why? If there is any discrepancy between input and output, ...
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3
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194
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Amplify DC signal: how to deal with real life problem ==> output is close to Vs when input signal too small OK otherwise
Hi I believe this problem must be classical and well known but I cannot find a place where it is specifically discussed:
I have build a simple non inverting 2X amplifier following exactly the ...
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2
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131
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Why are low values of resistor in non-inverting configuration of opamp causing gain peaking?
I am trying to simulate frequency response of TLV07 in non-inverting configuration for gain 10 as shown below:
The frequency response shows peaking as shown below:
It is worse for smaller values of ...
2
votes
1
answer
118
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Why does current noise flow through the parallel combination of R1 and RF in a non-inverting opamp?
I am following this reference for noise calculations of a non-inverting op-amp.
I am not able to understand why the equivalent resistor is the parallel combination of R1 and RF as shown below:
I ...
1
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1
answer
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Why is the op-amp not able to amplify this voltage? It's a straight-forward non-inverting configuration with ideal op-amps(LTSpice simulations)
So I have the following configuration (pretty straight forward right?)
But following are the waveforms of V_induced(the voltage to be amplified) and V_induced_amplified. As you can see, the voltage ...
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6
answers
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Why put a resistor in series with the positive terminal in a non inverting op-amp circuit?
I've tried to find the answer, but failed.
Why do we add R1 in series with the positive terminal for a non-inverting amplifier? What is the best value we can assume or choose for it?
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non-inverting current sense op amp output unstable during the measurement
I would like some advice on how to solve the following problem. The following circuit is motor driver with current sense circuit. The circuit run motor at cca 30mV when is not under load, but when the ...
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1
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171
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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 ...
0
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2
answers
102
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Am I measuring the Op-amp MCP6004 IC output voltage correctly using Arduino
Right now I am testing an MCP6004 Op-amp IC. A sensor in my main circuit going to give me a signal in the range 0-0.5 V max. So, I want to amplify this in the 0-5V range so that my Arduino reads it ...
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2
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94
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Motion Sensor Design
I'm trying to design a motion sensor alarm. If there is movement in my house, the motion sensor will send out a signal which will be connected to an alarm that will make a loud noise. I'm currently ...
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3
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163
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How to analyze this opamp circuit?
So with the following circuit (currently studying for an exam):
I am able to get V- just through the voltage divider composed of 2R and R at the non inverting terminal. However, once there, I am ...
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3
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2
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423
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Non-ideal Non-inverting op amp
This is probably more of an algebra question.
I do not understand where the "1"s come from in equation 1.10 given the much simpler voltage divider equation in the line just above it. And why ...
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168
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Amplify 1kHz sine wave from AD9833 DDS using LMH6609 operational amplifier
I'm trying to amplify a 1kHz sine wave signal from the AD9833 DDS chip (0.6Vp-p) to a more usable level (6Vp-p) for a sort of function generator. I plan to work with higher frequencies as well. So I ...
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1
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99
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Non Inverting Op Amp output near power supply voltage when input voltage is at 0V
I have a simple non inverting op amp circuit.
I am using this to amplify a DC voltage. The positive input voltage will vary from 0V-5V.
My problem is that regardless of the input the output is about ...
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1
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58
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Why does my single-supply non-inverting amplifier produce a wierd shape (depending on earphones)?
I built this circuit:
It is based on this design for a single-supply non inverting amplifier:
When I tested my output waveforms with earphone A I got normal results:
When I used earphone B, I got ...
0
votes
1
answer
36
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How impedance levels affect a non-inverting amplifier?
I need help understanding what the highlighted section means. I mainly want to understand how it determines the current drain when using difference resistance to get the same gain, and how it affects ...
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1
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135
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Combining inverting and non inverting opamps
I have a circuit:
Assuming the op-amps are ideal, how do I derive an expression of Vout in terms of A and B?
I set B to 0 and worked out that the output of the opamp connected to A is 9A, and by ...
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2
votes
1
answer
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Inverting Amplifier Circuit using Single Power Rail
For my homework, we are supposed to simulate an inverting and noninverting amplifier using a single supply and the LM324 opamp. I built the inverting amplifier using a voltage divider, but my output ...
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1
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106
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Op Amp Selection Help for Rail/ Rail IO
I am looking for an operational amplifier which will fit my requirements.
My circuit consists of two cascaded non-inverting amplifiers.I have a classical non-inverting setup.The minus pin of both ...
0
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2
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124
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Problem in controlling the device temperature using an op-amp
OBJECTIVE:
I have a device to which voltage is applied and this voltage has to be controlled according to the temperature detected by the thermistor that is placed on the device. If the temperature of ...
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2
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417
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transfer function of non-inverting op.amp circuit
I am trying to find the transfer function H(s)= Vo(s)/R2(s) but i am struggling to get it. I am assuming an ideal op-amp. V+=V- and that no current flows through the pins op the op.amp.
simulate this ...
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3
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366
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Why is the output impedance of a non-inverting op amp zero? [closed]
Also is it actually zero or just very low?
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1
answer
491
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Op amp output voltage offset too high
While building an opamp based non-inverting amplifier for my project I noticed that it always has some considerable output voltage despite having the input at zero. To verify that problem I built the ...
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2
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145
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Difference between two gain +1 op-amp topologies
I've got two differential driver circuit designs that take a single ended input and provide as output a buffered pair of +1 and -1 times the input and I'm struggling to understand the difference ...
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1
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NE5532 opamp on amplifier circuit
The picture below is named as headphone amplifier on the internet. My goal is not to do "headphone amplifier". I want to design an analog frontend with a bandwidth of 10 MHz for ADC input. This ...
user249025
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6
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Single supply opamp with AC coupling
I am trying to make an amplifier with an opamp, using a single supply.
I found lots of ressources online. This response was very informative and I tried to simulate this circuit.
Let's say that I ...
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2
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106
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Op amp output DC operating point variation with load current
Consider a cmos op amp in non inverting configuration. For a small load current, we expect the output DC voltage to be the input DC voltage multiplied by closed loop gain. As the load current is ...
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Line input circuit
I'm trying to design an unbalanced line input for an audio device using a single supply. I would like the input stage to provide variable gain between 0 and 2.
This is what I have come up with so far:...
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1
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106
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Limit the current draw from Op-Amp
Following up on this question I redesigned my circuit with the suggestions from the comments (see comments from @Andy_aka). I want to drive the output of the opamp between 0-24V with an Vin = 0-10V. I ...
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Why is the output signal greater than the input signal in this voltage follower circuit?
I have implemented this circuit on my breadboard.
The voltage waveform at point A and B in the circuit attached below should be equal because it's a voltage follower, but in my case, after ...
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1
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2
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447
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Is this Non-Inverting integrator correct?
I've seen time again the formula for an inverting integrator. I was wondering if I could swap the configurations on the inverting and non inverting inputs of the op amp to make the circuit a non-...
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2
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166
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What is the gain in a non-inverting amplifier
I am unsure if I am tackling this problem correctly. The input signal is connected to terminal E4 and the output signal is observed at terminal E9
What is the voltage gain when E1 is connected?
What ...
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237
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Non-inverting amplifier with negative supply rail
simulate this circuit – Schematic created using CircuitLab
The formula Vout = Vin * (1 + R2 / R1) is not valid for this case? because for example I'm feeding ...
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Calculation of noise in Non inverting Op-amp circuit
I have this non inverting op-amp circuit:
I would like to calculate the output with the Op-amp noise impact.
I can easily find the voltage output, but only if I assume there is no noise.
How to do ...
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2
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2k
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Non-inverting amplifier with variable gain from 1 to 15
I need to design a non-inverting amplifier with gain from 1 (unity) to 15. From what I read, in theory this can be achieved by using a pot as the feedback resistor, but in practice this will only work ...
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1
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94
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Design of Low Pass Filter
So I have made a low pass filter and plotted the transfer function of it. However, I know I need to also use another opamp to correct the phase shifting/ gain. What design should be best to add on to ...
4
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1
answer
334
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Non-inverting op-amp saturating incorrectly
Background
Hello, I'm trying to amplify an audio signal using an LM324N in a non-inverting configuration. I'm not trying to build an audio amplifier to drive speakers, I just need to amplify it a bit ...
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1
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1k
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Floating input in Op-amp Readout Circuit?
I was analyzing this circuit diagram in a thesis about a capacitive EEG electrode. The author talks about a flaw in the design where there is a "floating analogue input" that is causing the op-amp to ...
5
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3
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2k
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Non-inverting amplifier ; Single supply ; Bipolar input
I am working on the non-inverting amplifier using a single supply, which can amplify bipolar input signal. Non-inverting amplifier is working fine without any issues, only the negative portion of the ...
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3
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615
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How to add a low pass filter to this non-inverting amplifier circuit?
I've come up with this simple circuit as an amplifier before an 8bit ADC which receives audio signals. R2 is actually a variable resistor (pot.) of 100k. The circuit also biases the signal to VCC/2 ...
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2
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629
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Gain of Non-Inverting Amplifier Does Not vary with Resistor Values
I am trying to build a non-inverting amplifier using a LM7171 op amp, and I am implementing it with potentiometers as Rf and R2 so that I can smoothly control the gain of the amplifier (and easily ...
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