Questions tagged [single-supply-op-amp]

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Amplification of Sensor

How would one can amplify a sensor with an internal resistance of 80kohm (produces a Voltage of 500uV). Which opamp can I use? Which type of opamp configuration can give me accurate results? Accurate ...
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1answer
65 views

Texas Instruments fully differential op amp app note: I'm having difficulty understanding an equation (single ended to differential video conversion)

I am developing a circuit to convert single-ended video to differential, based around the TI article "Converting single-ended video to differential video in single-supply systems" by Jim ...
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2answers
83 views

LM359 Quartz Crystal Oscillator Schematic not working

I'm trying to design a Crystal Oscillator based on the LM359 chip and the schematic on the datasheet but it's not working. It does not do anything. What I'm doing wrong? I changed some components ...
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2answers
61 views

Low cost op-amp with Common-mode input voltage range of 1.125V

I'm developing a project where an op-amp is configured to bring a input voltage difference ranging from 1.8V to 3V to a output voltage ranging from 3V to 5V. The output of the op-amp will be fed into ...
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1answer
65 views

Op-amp astable multivibrator with single supply

I want to create a simple circuit to flash a LED with one op-amp. I already simulated the circuit (astable multivibrator) but there is one problem with the supply. I don't know what to change so that ...
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1answer
88 views

Attenuating mid-supply biased audio signal before AC coupled audio amplifier

The context here is simple volume control of a DAC generated audio signal with a potentiometer before an audio amplifier stage in a single supply, battery powered system. Is there any advantage to ...
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1answer
89 views

Floating Differential measurement?

Can I simply hook up an opamp inputs, (either using a differential or in-amp topology that is/are also powered from a floating power supply), across a device under test that itself has exceeding ...
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3answers
48 views

Reasons for constraining single-ended Op-Amp VCC when multiple power rails available

If I am utilising an op-amp, say a LM321/LM324, say in single-supply operation as a buffer and have a multiple suitable power rails available then are there, assuming I do not expect to utilise the ...
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1answer
59 views

LED blinking using LM358 operational amplifier

As an exercise in getting more familiar with op-amps, I have built this blinking LED circuit: With the values above the circuit works fine on the breadboard, and in the Falstad simulator: Simulation ...
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0answers
31 views

Diff Op-Amp in current measurement ignores input [duplicate]

I'm working on a small project which involves current measurement. I'm using R10 to measure Voltage drop (100 mV) when 10 mA current goes through it. Next I'm amplifing that signal around 37 times ...
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1answer
33 views

What is the cause of the error/unexpected outcome in water temperature control heating system circuit?

Here is the circuit with components I built as shown over here. The title of the circuit is water temperature controlled system. The function of this system is to control the heating while sensing the ...
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1answer
67 views

Attenuating op-amp circuit with offset

I am designing a non-inverting op-amp circuit that maps an input signal (V3) 0-3.3V to an output signal (Vo) 0.2-2.4V. I opted to offset the output up by 0.2V and then used a second op-amp circuit as ...
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2answers
57 views

variation in source votlage is allowed in a constant current circuit?

Reference question: understanding constant current source circuit With respect to the linked question, I am seeing a variation in the load current as I change the voltage \$V_2\$ to and fro from \$...
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1answer
47 views

High voltage non-inverting operational amplifier for DC signal

I am currently using LT6090 with Vcc=140 and Vee=0 for DC signal amplification with gain of 31 in non-inverting mode. For an input signal of 0-4V from a DAC the output measured is 0-124V (step change ...
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0answers
19 views

MSGEQ7 with an op amp and biased input

I'm wiring up a MSGEQ7 with an op-amp (TL071 single supply) amplifying the signal from a 3.5mm jack. I do not have a -ve rail supply (just using the 5V out from an arduino). Would the MSGEQ7 work with ...
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2answers
184 views

Unexpected output voltage in opamp (LM741, DC, single supply) circuit [duplicate]

As a beginner I tried to make a simple DC circuit with an opamp on a single supply. This is what I came up with: simulate this circuit – Schematic created using CircuitLab I use R3 and R4 as a ...
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1answer
63 views

Op Amp Voltage follower

I built a simple non inverting op amp amplifier with 2 resistors and a TS972IN powered between 0-5V but my output was always set to 5V. I tried several others Op Amp, others resitors and I also moved ...
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1answer
77 views

Current Transformer noise in idle state

[ *Violet is the bias voltage. Yellow is the CT output. You can see it drifting from bias volt a little. * I want to build a power measurement circuit using STM32F407. I am using LM324N opamp for the ...
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140 views

VCA on 5V powersupply

I've made a VCO and ADSR-generator with two Arduinos. The VCO uses a DAC made with a resistor ladder, the ADSR-gen uses a 12bit DAC. Everything is 5V powered (USB charger of 1A). In my search for a ...
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2answers
75 views

Help getting the transfer function of a circuit

I have been trying to get the transfer function of the circuit below for some days now and I eventually get to an expression but I don't believe I am geting the correct expression and here's why (the ...
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0answers
63 views

Single Supply Op Amp, (With AC?)

Hey guys, I'm trying to understand how to use op amps, right now I just have a battery hooked up to the non-inverting, and a virtual ground, this is a single supply cause I don't have many tools to ...
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2answers
93 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 ...
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1answer
43 views

Effective impedance calculation for noise removal from supply

I am working on single supply Op-Amp amplifier, referring to this post. While calculating the value of the capacitor C2, as to pass all the noise from the supply to the ground. I am unable to ...
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1answer
262 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 ...
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0answers
111 views

Opamp buffer output sine wave, is it normal?

I'm using this opamp - GS8331/32 to buffer voltage reference to ADC. Here my oscilloscope measure input and output of opamp: Why ouput is sine wave? Is it normal or because of my opamp? Any way to ...
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1answer
95 views

Waveform at the negative terminal of an OPAMP

I am trying to sketch the negative waveform of an OPAMP over here. I am not sure how to proceed with this as I have usually seen OPAMP with dual power supply. But this one have +9V and ground. My ...
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1answer
196 views

Voltage scaling of analog signal -10 to +10V to 0 to 3V inorder to give it as input to ADC using opamp TL082 and TL431

I have a sensor which gives an output of -10 to +10V, I need to scale down it to 0 to 3V in order to give it as input to ADC of microcontroller. I have opamp TL082 and TL431. I have attached a ...
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0answers
46 views

INA125 gain problems

I'm trying to use an INA125 to read a load cell. Its connected as in the single supply diagram in the datasheet (see below). The gain should be 4+60K/Rg. However whatever resistance I make Rg, the ...
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2answers
162 views

Low frequency level shifting using single supply opamp

Referring to this discussion, I want to ask whether this can be done using single supply? I have a similar problem where my input is a triangular wave swinging between 130mV and 500mV at 250Hz ...
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2answers
231 views

Active band pass filter + offset

I'm trying to know the fr equation for the following op amp configuration: I have some capacitors values for specific fr frequencies: fr = 34Hz -> C = 33nF fr = 50Hz -> C = 22nF fr = 160Hz -> C = ...
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2answers
43 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 ...
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1answer
68 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 ...
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0answers
134 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 ...
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1answer
42 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 ...
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2answers
344 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 ...
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3answers
128 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?
1
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1answer
340 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 ...
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1answer
131 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 = ...
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2answers
2k 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 ...
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1answer
86 views

Single supply inverting OP amp. Problem: half signal at output

I have built a simple inverting amplifier circuit with LM4565 operational amplifier. But only half of the signal appears at the output of the circuit and the gain looks wrong as well. Could anyone ...
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2answers
297 views

Why do we use one bias (VCC) for transistor amplifier circuits and 2 supplies for opamp circuits? [closed]

Opamps are said to have 2 supplies, so that the output can rail between these two points, then why do transistors have only one bias point.
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2answers
205 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 ...
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3answers
763 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 ...
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3answers
820 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). ...
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2answers
93 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 ...
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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 ...
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1answer
134 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 ...
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1answer
118 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 ...
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1answer
455 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 ...
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2answers
983 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: ...