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Questions tagged [single-supply-op-amp]

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0
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2answers
46 views

Does this Sallen and Key filter work on a single supply and does the input offset matter?

This is the schematic for a Sallen and Key from the Doepfer Musikelektronik website: simulate this circuit – Schematic created using CircuitLab I intend to run this in a synth, the oscillators ...
0
votes
0answers
16 views

isolated and non isolated current and voltage sensing

I am designing Half bridge single phase dual loop(outer voltage and inner current) inverter with 120Khz switching frequency, and i want to sense inductor current and output voltage, conventional LV25-...
1
vote
3answers
112 views

Analog circuit for moving-mean/moving-average

As a part of signal conditioning stage I am trying to find the moving mean/moving average of a signal at the output of instrumentation amplifier (used LM324-N for instrumentation amplifier). Is it ...
6
votes
3answers
580 views

Current sense amplifier + op-amp buffer + ADC: Measuring down to 0 with a single supply

I'm thinking about current sensing with a high dynamic range (10 mA - 20 A) and using LTC6102 as a high-side current sense amp (the voltage would be 54.6 V max, a 13S6P Li-ion battery). ...
1
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2answers
59 views

Single supply inverting op amp output

How does the output (say, a sine wave) of a single supply inverting op amp compare with output of a single supply non-inverting, since it cannot go below 0v? Is the phase shifted? I'm trying to ...
4
votes
3answers
1k views

Strange opamp's output impedance in spice

I'm simulating this circuit in Micro-Cap, which is the clipping stage of a guitar effect. The opamp model is the "NE-5532" I want to measure the input and the output impedance. I expected an output ...
0
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0answers
75 views

What is wrong with this single supply opamp circuit for audio?

I am currently building an output stage for a DAC with opamps, in single supply configuration. Here is my circuit from LTspice: I have exactly built this on PCB, so I am talking about the real thing ...
0
votes
1answer
96 views

how does single supply op-amp work while its non-inverting input is connected to ground?

In HCNR200 Datasheet, the page 11, figure 13-A, there is a sample that confused me. In this sample, the Vin is applied to the inverting input and if the electric current passes through PD1, PD1 ...
0
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1answer
37 views

Simulating absolute value circuit in TINA-TI

I am looking to build an absolute value circuit using a pair of op-amps, hopefully using a single supply and would like to simulate my design using TINA-TI. The ultimate aim is to measure the voltage ...
5
votes
1answer
140 views

What might be causing an op amp to fail in a voltage follower circuit?

I have the following super simple op amp circuit that makes use of the AZV321 single op amp (https://www.diodes.com/assets/Datasheets/AZV321.pdf) in order to balance the voltage on a pair of ...
2
votes
2answers
157 views

Bandpass Filter: Single supply op amp design

I have taken on a hobby project and I am trying to make a circuit which would be able to identify an acoustic signal with a frequency of 40kHz. Here is the circuit of a band pass filter for this: ...
0
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1answer
67 views

Running +/- 15V opamp at 3.3v

I find I need a comparator, because I have a problem with an optical sensor triggering multiple interrupts, like this question: https://arduino.stackexchange.com/questions/13287/interrupt-fires-...
0
votes
1answer
82 views

Single supply opamp colpitts oscillator

I'm designing a Colpitts oscillator with a single supply rail-to-rail opamp powered with 3.3 V. The positive input of the opamp is set to VDD/2 to offset the negative part of the oscillations so ...
1
vote
4answers
130 views

Differential amplifier with common voltage far above the rail?

I have a thermocouple with one end connected to +24V. I want to be able to read the voltage (-5mV - +20mV) on it using a 3.3V ADC. The most reasonable solution I see is lowering the voltages using ...
2
votes
1answer
99 views

Single supply op amp with input attenuator

I'm designing a guitar headphone amplifier that uses a single supply op-amp as the output stage to the headphones. I'm using a potentiometer after the final JFET stage and before the op-amps as a ...
1
vote
2answers
101 views

Difference between these two op amp circuits

I came across this circuit for a non inverting op amp which is biased Vs/2. I'm wondering what the difference bettween these two circuits are? What is the purpose of R3 in the first circuit and how is ...
0
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2answers
160 views

Differential Opamp Strange Behavior

I have no answer for this strange opamp behavior. The circuit shown is from a typical nonisolated ,Non grid-tie inverter product (imagine H bridge Inverter). which has a common -ve high power circuit ...
2
votes
1answer
181 views

Can a Single Supply Powered Op-Amp Handle Negative Input Voltage?

I have an input sine wave at 300mV peak to peak. I want to filter this sine wave to eliminate noise and distortion. I am planning to use the LMx58-N op-amp family, powered using a single supply: 3V ...
-1
votes
2answers
96 views

Buffer OpAmp hitting high rail

I am using an STMicro TL084 Opamp in a buffer format and wondering why i keep hitting the Open Circuit +12V voltage rail. There are 2 possible connections in the below image, the first being the ...
1
vote
0answers
72 views

Can this circuit be simplified?

The circuit is a LPF with a buffer stage in front of it that uses a linear pot. to control gain & attenuation. The setup is such that the response of the linear pot. is similar to a log. pot.. A ...
-1
votes
1answer
216 views

Current source with op amp and transistor

I'm building current source with OP AMP LM358 and MOSFET transistor IRF5305. Here's schematic diagram of the circuit: I have two questions about it: 1) Maximal gate-source voltage of IRF5305 is +/-...
0
votes
1answer
71 views

Op amp AC simple supple (Buffer) LM324N

I´m working on a proyect and i use OrCad/Spice to simulate the op amp that i gone use and my Voltage(output) signal is Constant and my Voltage(Input) is sinusoidal.
0
votes
3answers
128 views

Single Suppy Opamp for inverting amplifier produce negative voltage signal

i made an inverting amplifier circuit using CA3130, the supply just the positive voltage and GND for V- supply. the circuit is used for full wave rectifier because the signal is around 1 MHz and 500 ...
0
votes
2answers
57 views

op amp single supply with nonlinear gain below 1 and start offset

Is it possible to create a circuit with an op amp (single supply) that have a nonlinear gain (below 1) slope and a start offset? See image Green = input Red = output
0
votes
1answer
173 views

Instrumentation Amplifier input saturation problem

I designed and ordered some PCBs for in-amp but having a problem, I think it is input saturation. The power supply is 0V, 6V, and 12V rather than -6V, 0V, 6V but I am only interested in AC so this is ...
0
votes
1answer
39 views

transimpedance op-amp wrong and random output

from my previous question (this link) i advised to using operational amplifiers to converting current changes to voltage changes then i followed the standard circuit for a transimpedance ...
-3
votes
2answers
82 views

set gain on inverting preamp

I built (more or less) this opamp. I know normally the gain would be defined by the ratio of the feedback resistor to the input resistor but here there is no feedback resistor so how do I tweak the ...
0
votes
3answers
155 views

OpAmp VS Voltage Divider VS Buck Converter (Current Sensor Output)

I'm working on part of a project and I need to build the circuit that reads the current through a phase of a motor using this IC from Allegro. Assuming there will be no more than 5A, and using a VCC=...
-1
votes
1answer
76 views

Noise Cancellation Project [closed]

I am working on a noise cancellation project and I am having problems with my design once I breadboard it and connect my 8ohm load. Design Notes: I am not applying/mixing any kind of signal into ...
0
votes
2answers
561 views

Why is the MCP601 better suited than the LM833 for single supply applications?

Still not answered, please need some help. If you guys don't know the answer don't be afraid to admit it, but I want to generate discussion around potential solutions/calculations and not semantics ...
0
votes
1answer
52 views

Debugging a op-amp based comparator

I am trying to build a high frequency (~ 5MHz) level shifter circuit. For this purpose, I designed a comparator circuit based on TI's THS3491. The circuit schematic is shown below: simulate this ...
1
vote
1answer
233 views

Problems while using op-amp as a comparator on a single supply

Here's my circuit: . Application: The circuit is for ground fault detection. When a fault current of 20mA flows through the primary of the current transformer (1:660), it generates a current of ~30uA ...
0
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2answers
134 views

How to get inverting amp in an electronics project with 1 battery

I am trying to invert the signal from a microphone for a simple noise cancellation project. I am using a 3.7V lipo battery, right now I am trying to use a single supply op amp (TLV2462), but don't ...
0
votes
2answers
284 views

Why does this single supply non inverting Op-Amp saturate?

I have this simple non inverting setup made with a TL082IP Op-Amp and a gain set to 2 (R1 = R2). Since I will only have positive voltage 0V to 5V to amplify, I use for simplicity a single 12V/0V ...
4
votes
2answers
708 views

Saturation problem of comparator [duplicate]

I am trying to design a comparator using a 741 IC, with a single supply of 12V. I have set the reference to 2V and I require the output to toggle between 12V to 0V. but the problem I am facing is the ...
0
votes
3answers
101 views

OPAMP - Current sense - unexpected behavior

I want to trigger an interrupt on an ATMEGA328P, when the current of a load is below a certain value. Therefore I designed the following differential amp circuit using an LM358 Below picture shows ...
0
votes
1answer
300 views

How to calculate frequency of this Op Amp square wave oscillator?

I was trying to come up with the equation to calculate the frequency of this circuit. R1 and R2 are creating analog ground because I am using bipolar op amp for a single supply operation. Thank you ...
0
votes
1answer
465 views

NTE941M Non-inverting OpAmp Has Non-zero Output with 0V Input

I have a non-inverting, single-supply, variable gain op-amp circuit configured in accordance with this diagram: Vcc: +16V Rf: 800k Ohm Potentiometer R2: 100k Ohm I have the potentiometer set to ~...
0
votes
1answer
337 views

Limited output voltage swing in lm358 opamp

I was having trouble designing a small headphone amplifier that used lm358 as input stage. After verifying the push-pull output stage was correct and that every DC point was correct too (output ...
0
votes
1answer
259 views

LM311 Op Amp as a differential amplifier to drive a solar tracking motor

I want to drive a 12v DC motor that will rotate an array of small solar cells to track the sun across the sky. I intend to use two smaller solar cells as my sun "position sensor" by having them at an ...
0
votes
2answers
295 views

Supply Voltages for Inverting Amplifier

I want to use an inverting amplifier to linearly shift and convert a signal with voltage range -10...+10V into 0 ... 3.3V for an ADC of a microcontroller. I wanted to use the circuit presented in this ...
0
votes
1answer
159 views

OpAmp for FOC current sensing on a BLDC/PMSM

How critical is this pull-up resistor to Vdd for current sensing in a Field Oriented Control of a BLDC or PMSM? Right now, I don't have that pull up...I'm running the shunt resistor voltage straight ...
1
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6answers
1k views

Single supply amplifier for driving 8ohm, 0.7W speaker

I am trying to build a simple amplifier to drive an 8ohm, 0.7W speaker using a 5V single supply. Audio fidelity is of little importance, since it is a cheap speaker, but I would like the output to be ...
0
votes
1answer
104 views

How to make LT1168 instrumentation amplifier work with single supply?

I am using the LT1168 instrumentation amplifier for my project and I am trying to figure out how to make it work with a Li-Poly 3.7 Volts battery. I am not able to understand the single supply ...
-1
votes
2answers
250 views

offset errors in opamp in DC and AC [closed]

I want ask about When the offset errors be more serious, when amplifying dc or ac signal in op-amp i search but noting found in this area
-1
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2answers
98 views

Can opamps work with signal that may go higher or lower than supply voltage?

I'm trying to make a impedance meter using STM32 and I want to ask that question to make sure it work ( at least the theory). So, Can opamps work with signal that may go higher or lower than supply ...
3
votes
2answers
378 views

Opamp output current

In experimenting with a follower circuit using an NE5532 opamp, I am trying to determine the maximum allowable output current for design purposes. The datasheet is lacking curves in this area, but ...
0
votes
1answer
86 views

Signal Filter Shunt to GND or Virtual GND

In the following two circuits, I am using a TLE2426 as a low impedance virtual ground to bias multiple single supply opamps/diff amps. At the output is an LRC filter, but I'm not sure whether to ...
0
votes
0answers
54 views

Two Op Amp In-Amp Voltage output

I mounted the following circuit using a LM324, where Val = 5v, Vref = 1.78v, R6=18K and R7=10K. I measured Vu and i'm getting a very close value to Vref, why? Edit: V- and V+ are connected to Vref ...
1
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0answers
246 views

Audible Ticking in Audio Opamp Circuit

I'm experimenting yet again with the following audio mixing circuit: On the scope with signal gen as source, everything looks great. When hooked up to the input of a mixer with a laptop as the source,...