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Questions tagged [single-supply-op-amp]

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0
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1answer
22 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 ...
4
votes
0answers
87 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
95 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
61 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
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1answer
55 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
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4answers
123 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
78 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
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2answers
99 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
153 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
140 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
80 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
151 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
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1answer
59 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
106 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
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2answers
56 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
159 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
72 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
127 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
74 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
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2answers
462 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
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1answer
49 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
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1answer
183 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
votes
2answers
111 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
203 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
688 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
91 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
219 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
343 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
295 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
213 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
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2answers
224 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
140 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
896 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
90 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
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2answers
224 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
92 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
326 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
84 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
233 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,...
2
votes
2answers
145 views

Single supply OPA445?

So basically I'm trying to make a circuit for a piezo-electric actuator. I only have access to a single supply at +70V for my op amp, an OPA445AP. Vin varies between 0 and +3V. I've looked at the help ...
2
votes
2answers
326 views

Why must this capacitor be a “low leakage” type?

I was reading this article discussing non-inverting opamps and when presenting the above single-rail opamp circuit it gave the following not regarding capacitor C2: Capacitor C2 type: It is ...
0
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2answers
62 views

Can I bias this circuit to zero

H i, I am new to this, so please excuse my lack of knowledge. How can I bias this to zero, and is there a way to increase the dynamic range. I will mbe using this as a sound trigger for an arduino ...
1
vote
1answer
143 views

pH sensor buffering, gain, and offset with one inverting opamp

I'm working on the above mentioned circuit. I'm a hobbyist with little electronics training so don't laugh if something terribly dumb comes out of my keyboard please. Anyway, a different question on ...
4
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2answers
508 views

Simple single-supply op amp virtual ground questions

I found this circuit online and made it and it works. It uses an LM358 op amp to amplify an oscillation from a 555 in astable mode. simulate this circuit – Schematic created using CircuitLab ...
0
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2answers
329 views

Opamp voltage supply

Given an opamp to which we can apply a supply voltage of 5v. Does this mean it has to be only +2.5 and -2.5 V or could it be 0 and +5v. Is there a difference? Thus is it possible to convert any opamp ...
1
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0answers
351 views

Output to ground rail on single-supply op-amp with grounded load

I'm having some problem comprehending the internal functions of op-amps and I'd appreciate any insight in to why my circuit behaves the following way: I'm working with TI's OPA548 op-amp (PDF ...
0
votes
1answer
257 views

Anything wrong with this level shift and amplify op amp circuit?

I posted this circuit in a question about protection clamping, but got a lot of questions around the circuit itself. Is this not a good / the normal way to shift and amplify a low amplitude (75mv) ...