Questions tagged [non-inverting]
157 questions
13
votes
1 answer
Will this passive non inverting anti-log circuit work?
The potentiometer on the left of the circuit below is actually the output of a digital potentiometer designed for audio volume control, so its outputs are internally configured to offer 64 logarithmic steps, from 0dB to -64db. I can't change that.…
Randy
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11
votes
4 answers
Inverting op-amp problem
Down below is an inverting op-amp circuit with a capacitor C connected to the non-inverting input. I have to find the voltage at point A and express it using vin, C and R.
I tried to solve the problem using nodal voltage analysis:
(vin - va)/R =…
kauselis3000
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10
votes
6 answers
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?
Abdallah_98
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9
votes
6 answers
Why do we need R1 in a non-inverting op-amp?
I am quite new to learning op-amps.
What is the purpose of putting R1 there? Does this have any meaning in the design of a microphone amplifier?
I read about this from another answer, which says that the resistor provides a low input impedance for…
ryan
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6
votes
5 answers
Non-inverting op-amp
Why is resistor R1 connected to the inverting terminal of the op-amp in a non-inverting op-amp configuration? What will happen if we replace it with a short circuit?
Jina
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6
votes
2 answers
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 resistors like 1 and 10:
The response is…
needbrainscratched
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6
votes
6 answers
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 have +/-0.5V signal, and I want to amplify to +/-1V.…
risk
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5
votes
5 answers
Single-supply non-inverting op-amp for summing DC voltages at unity gain
Is it possible to use this single supply, non-inverting, summing op-amp configuration to sum multiple arbitrary DC voltages at unity gain?
I've used the inverting summing op-amp config on bipolar power supplies to sum AC and DC input voltages…
robobozo
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5
votes
5 answers
Is hysteresis needed for this non-inverting comparator?
I’m trying to figure out if the following comparator circuit (TL331) would be reliable in the following application, or whether I would need to add anything, like hysteresis.
To explain the application, you have a microcontroller (ESP-32 in this…
Turboduinoz
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5
votes
2 answers
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 LPF. The Vbuff voltage is a buffer voltage to…
AngusE
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5
votes
2 answers
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 the next picture :
and it is, Av = 1 + (R1/R2)…
Daan_1
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- 3
5
votes
3 answers
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 input is clipped. The schematic is shown below.
…
TapasX
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5
votes
2 answers
Is it possible to make a non-inverting amplifier with positive feedback?
The 'classic' non-inverting amplifier configuration uses negative feedback. What happens when the + and - terminals are switched? Based on my pencil-and-paper analysis and a Circuitlab simulation, it seems that the result is the same. Is this…
odougs
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4
votes
4 answers
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 for finding the output impedance of a circuit. Why…
user246795
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4
votes
2 answers
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, I would expect it to be that the output is not…
Raul M.
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