Questions tagged [single-supply-op-amp]

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8
votes
3answers
813 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 ...
6
votes
3answers
726 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). ...
5
votes
1answer
313 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 ...
4
votes
2answers
767 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 ...
4
votes
2answers
1k views

Single supply non-inverting amplifier using op amp

I'm working on building a distortion guitar effect pedal for an analog electronics class I'm taking. I am struggling with building an amplifying circuit using an op amp (we just began learning about ...
4
votes
2answers
786 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 ...
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 ...
3
votes
2answers
499 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 ...
3
votes
1answer
179 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 ...
2
votes
4answers
408 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 ...
2
votes
2answers
508 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 ...
2
votes
2answers
201 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
395 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 ...
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
1answer
57 views

How to calculate the value of the thermistor based on the output voltage of this circuit

I recently bought a board that consists of this circuitry. It came without an instruction whatsoever, so I have to figure out how to measure the temperature based on the output voltage at the To. The ...
2
votes
1answer
297 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 ...
2
votes
2answers
153 views

Full wave rectification by opamp

I am trying to read a current waveform from a shunt resistor series with the power line. Using a full bridge rectifier, I got the following waveform: The waveform was sampled every 2 millisecond ...
2
votes
2answers
452 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: ...
2
votes
3answers
425 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
1answer
2k 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 ...
2
votes
1answer
199 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 ...
1
vote
3answers
345 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 ...
1
vote
4answers
151 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 ...
1
vote
1answer
37 views

Analysing AC-Coupling differential opamp configuration

I built an audio DSP board based on CS4272 and used its reference design for the output section. The signal is getting extremely distorted when summed signal exceeds ~0.7Vpp. (Rail voltages 0V-5V and ...
1
vote
2answers
68 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 ...
1
vote
1answer
324 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 ...
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 ...
1
vote
1answer
41 views

Understanding current sourcing and sinking in TL2426 rail splitter

I have a 40dB active bandpass filter being powered off a single rail power supply with the TL2426 providing a virtual ground so I can get a dual power supply configuration. Currently, I'm having ...
1
vote
1answer
142 views

Synchronous demodulation with single supply op-amps

I am looking at the following article from Analog Devices: Use Synchronous Detection to Make Precision, Low Level Measurements, and I'm wondering if there is a way to build the following demodulator ...
1
vote
2answers
109 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 ...
1
vote
0answers
87 views

Switching between outputs using irfz44n mosfet

In the circuit shown, the input voltage to the op-amp ua741 is 1V and the output will be 5.7V, which switches the bottom left irfz44n mosfet on and the off voltage irfz44n mosfet off. So i would ...
1
vote
0answers
74 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
vote
0answers
272 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,...
1
vote
0answers
466 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 ...
1
vote
1answer
474 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 ...
1
vote
1answer
408 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
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
2answers
416 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 ...
0
votes
2answers
73 views

I want maximum 5V output from an Op-Amp. Is it a good idea to use a supply voltage for the Op-Amp of more than 5V?

I have the following circuit. An Op-Amp (currently TLC2272CP) as a buffer (voltage follower). The non-inverted input of the op-amp comes from a DAC (MCP4922). I measure with an ADC (MCP3202) the input ...
0
votes
3answers
78 views

Flat line on output of single supply sawtooth generator

I have built the following sawtooth generator using LM358 opamps: In simulation everything works fine, however in reality I get only flat line on output. Anyone got any idea what's going on?
0
votes
3answers
611 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 ...
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
877 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. ...
0
votes
2answers
332 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
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 ...
0
votes
1answer
82 views

Reference voltage changes when connected to inverting input of op amp comparator

The capacitor C2 keeps the value of a slow varying signal for some time. The capacitor discharges through the two resistors R3 and R4 with a time constant of \$\tau = RC = 10\mu F \times 1M\Omega = ...
0
votes
1answer
153 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
120 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
2answers
338 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
2answers
33 views

How to calculate an op-amp's current usage based on datasheet's supply current and its Vout terminal?

This might be a dumb question so if yes, I apologize. I would like to power an op-amp off of a boost converter and I need to know how much current an op-amp would use. I'm using TI's web bench and ...