# Questions tagged [non-inverting]

The tag has no usage guidance.

132 questions
Filter by
Sorted by
Tagged with
1 vote
416 views

### Calculating the relationship between Vout and Vin in a non-inverting op-amp

Circuit: I have to determine the relationship between Vout and Vin. When analyzing the circuit I realized it was quite similar to a non-inverting op-amp circuit. I know from my past homework that I ...
• 63
65 views

### High output voltage from non-inverting amplifier without input signal

I bought an LM358 amplifier module to boost the input signal of 0-1 Vpp 20 kHz sine signal to 0-3 Vpp 20 kHz sine signal (gain of 3.) I tested the circuit with the input pin (non-inverting pin) ...
• 21
435 views

### Thermocouple circuit not outputting expected values

My application requires 11 thermocouples to be sampled and logged. Below is the circuit diagram, containing a differential and common mode filter, non-inverting amplifier (gain 111) and a second order ...
• 73
66 views

### AD8065 Offset problem

I'm an electronic engineering undergrad and your discussions helped me a lot. As a project, i was instructed to design the front end for a data acquisition system. The specs as below. Supply +/- 5V ...
80 views

### 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 ...
• 319
691 views

### 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 ...
• 189
186 views

### 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 ...
• 53
143 views

### 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 ...
• 109
67 views

### 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 ...
• 11
464 views

### 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 ...
• 37
176 views

### 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
144 views

### 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 ...
227 views

### 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-...
394 views

### 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, ...
• 188
199 views

### 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 ...
• 181
185 views

### 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 ...
136 views

### 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 vote
115 views

### 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 ...
5k views

### 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?
• 223
95 views

### 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 ...
• 71
1 vote
224 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 ...
135 views

### 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 ...
• 135
113 views

### 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 ...
• 143
182 views

### 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 ...
• 577
665 views

### 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 ...
203 views

### 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 ...
• 15
130 views

### 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 ...
• 13
59 views

### 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 ...
36 views

### 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 ...
190 views

### 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 ...
• 103
73 views

### 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 ...
109 views

### 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 ...
207 views

### 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 ...
505 views

### 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 ...
424 views

### Why is the output impedance of a non-inverting op amp zero? [closed]

Also is it actually zero or just very low?
• 3
1 vote
618 views

### 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 ...
• 113
155 views

### 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 ...
• 480
1k views

### 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 ... 7k views

### 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 ...
• 193
118 views

### 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 ...
116 views

### 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:...
134 views

### 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 ...
• 405
267 views

### 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 ...
• 11
1 vote
490 views

### 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-...
• 199
1 vote
171 views

### 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 ...
• 3,193
283 views

### 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 ...
• 2,046
1 vote
157 views

### 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 ...
• 301
2k views

### 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 ...