Questions tagged [single-supply-op-amp]

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4
votes
2answers
734 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
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3answers
115 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
438 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
553 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
399 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
318 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
325 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
185 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
vote
6answers
2k 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
137 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
299 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
109 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
468 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
100 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
56 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
vote
0answers
265 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
192 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
470 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
votes
2answers
68 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 ...
2
votes
1answer
181 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
votes
2answers
719 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
votes
2answers
334 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
vote
0answers
443 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
315 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) ...
0
votes
0answers
223 views

Principle for converting dual power supply to single

I was recently attempting to build a voltage controlled oscillator from this website: http://www.schmitzbits.de/vco4069.html. I struggled with it, for various reasons, and eventually found this ...
0
votes
1answer
202 views

Op-amp for pulse width modulation, 5v single rail supply [closed]

For experimental - hobbiest purpose, I'm trying to control one 3-color led with the following circuit: Power: single rail, 5v. Signal generator: triangular 0-5v, 500 Hz (in next step, signal ...
0
votes
2answers
310 views

Single power supply for LF353N opamp

I only have one power supply and I only have the LF353N opamp. Is it possible to design a non-inverting amplifier circuit for this op-amp with only a single power supply? Otherwise, what are some ...
0
votes
1answer
81 views

Diff. Amplifier with Single Supply Opamp - Strange Behavior

I'm playing with some "precision" (as claimed by manufacturers) opamps and DACs to test how "precise" they are. So, the components I'm testing are: DAC7612U by TI: A two channel 12-bit (1mV/LSB, up ...
-1
votes
2answers
228 views

Opamp output saturates at 1.7V even though rail voltage is 5V

simulate this circuit – Schematic created using CircuitLab I am working on following circuit on a 4 layer PCB. The sensor gives output from 0.5V to 4.5V and has frequency response of 19 Hz ...
0
votes
1answer
263 views

Is it possible to amplify AC signal with In Amp in Single Supply?

Is it possible to amplify AC signal with In Amp in Single Supply, however, with a sufficient reference to 'compensate' the negative part of the signal? I believe that a in amp with a single supply, ...
0
votes
0answers
1k views

Calculate the gain of the instrumentation amplifier for an input current I

I'm a little confusing to calculate the gain of my instrumentation amplifier due to different variables and conditions that may influence the gain. I am creating a project, which needs to inject a ...
0
votes
3answers
562 views

Single Supply in Op-amps

I am using in a project TL081 operational amplifiers and an INA118P instrumentation amplifier. Both need a ± 15 V Symmetric Power Supply, however I have seen some projects in which it uses single ...
1
vote
1answer
464 views

Design Active Filter for audio (60hz-20Khz) with configurable gain, single power supply

I am trying to design an Active Band Pass filter, to pass frequencies 60Hz (220 v electricity noise) to 20K, part of ADC system. My source signal is coming from Piezoelectric sensor, which means more ...
2
votes
3answers
411 views

Measuring mOhm resistance using LT006 precision amplifier and 4-Wire Method

I am trying to use the 4-wire method to measure the resistance of small strip of carbon steel, which will have a resistance of about 0.3 mOhms. I am currently trying to test my circuit with a known 0....
2
votes
4answers
406 views

What happens to the maximun operating ratings when the device is unpowered?

I have a circuit with an OpAmp and a current transformer. My circuit applies a DC bias to the CT to be able to process the signal with an OpAmp with a single power supply, because the CT provides an ...
1
vote
1answer
386 views

dac output stage using single supply?

The following is a diagram from a DAC datasheet. It's an output stage for a high end audio DAC which has differential outputs. What would be the best way to implement this when only a single supply ...
0
votes
2answers
3k views

Can i use TL082 in a single supply configuration without any problems?

I am trying to use this op amp to work with single supply, I know that it is more recommended to go on with a near rail to rail option such as LM324 but I cannot take that route. I've tried to make a ...
0
votes
2answers
786 views

Where does the output current of an op amp come from?

I am trying to build a circuit that will amplify a 3.3V signal to 5V, but I also need to have an output current of 100mA. The source of \$V_i\$ (an FPGA) only has an output current of around 15mA. ...
2
votes
1answer
1k views

Can I use an LM324 voltage follower with a single supply to rectify an AC signal?

I have a question that is mostly related to voltage input common mode ranges. The LM324 should be able to go pretty close to it's negative rails, as a voltage follower would the common mode voltage ...
0
votes
2answers
915 views

LM358 Operational amplifier Output voltage rising with stable inputs

I'm modifying a step-up circuit based on UC3843 SMPS Controller to add a current limiting feedback to it. I'm using a low-side sense resistor (Rsense) amplified by an LM358: simulate this circuit &...
0
votes
2answers
398 views

Choosing a suitable Opamp to output a voltage reference

Part 1: the circuit and how it's connected I'm trying to take from the 2.5V coming from a voltage reference IC AD780 to go through a unity gain buffer then go through a 2x Gain opamp stage to finally ...
8
votes
3answers
796 views

Why isn't this opamp working correctly?

I am working on an adjustable current source. In a thread awhile back, various circuits were discussed: simple adjustable current source for LED string ... but as I have settled on one option, and ...
0
votes
3answers
150 views

Can opamps marked as single supply be driven from a dual supply?

Can an opamp designated as a single supply opamp be driven from +/- dual supplies as long as it is within the VDD - VSS range? I'm looking at this particular opamp from Microchip.
0
votes
1answer
3k views

PWM to DC converter with op amp - slowly but steadily rising output voltage

I assembled a circuit to convert a PWM signal generated by an Arduino to a DC voltage in the range 0..10 V. I use the 10k-10u RC filter to convert the PWM signal to DC voltage in the range 0..5 V, ...
2
votes
3answers
3k views

Photodiode and Arduino to measure the speed of a projectile

I am trying to build a chrono to measure the speed of a projectile. I plan to use an Arduino and photodiode. I would like the photodiode to change the state of the Arduino's digital pin when an ...
2
votes
2answers
389 views

What OP AMP spec should I be checking to assure this behavior

Recently, on the advice of others on another thread, I tried to migrate a dual supply OP amp circuit to single supply version. I needed a quad OP AMP, and the logic was that since my final circuit ...