Questions tagged [single-supply-op-amp]

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Having noise problem designing a stereo amplifier with TDA2030

So, I have successfully made a mono TDA2030 amplifier using a single-power-supply which worked flawlessly without any noise. But when I tried to design a stereo circuit with 2 TDA 2030 ICs, both of ...
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3answers
62 views

Biasing an inverting Op-Amp using a voltage regulator

When biasing an inverting op-amp input using a voltage regulator (say, L7805), at the non-inverting pin, can we use the same regulator to power other ICs or should we only use it on the op-amp? Also, ...
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45 views

Analog current sensor design help needed

I have been thinking for some time about a circuit. I have been a digital designer for most of my career, and have recently begun studying analog again, and find it a welcome challenge. I am trying ...
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23 views

Power Dissipation in Subtractor Op-amp Circuit

How much power can be assumed to be dissipated through the resistors of an op-amp configured as a subtractor like the one below? Theoretically, a very very small current should pass, but I don't know ...
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3answers
79 views

OpAmp with slightly negative supply for ADC input

I would like to discuss a design idea around the supply of OpAmps that drive a ADC cannels of a microcontroller or DSP. Let the ADC be supplied by 3.3V and 0V ("analog" supplies separated ...
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2answers
84 views

How to find input impedance for this op amp?

The simulation gives an output voltage of 1.427V and Av of 10. Based on the equation Av= -R2/Ri, Ri should be 7kΩ. However, when I calculate the total impedance using R3+(R1//R4), the impedance is ...
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1answer
46 views

Power an TL064CN OpAmp from USB?

I want to get into electronics and I am interested in creating oscillator circuits. In one experiment I wanted to use an Opamp for an oscillator and I am now stuck with the power requirements of it. I ...
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2answers
75 views

Need help with IR Transmitter circuit

I'm trying to understand the working of IR transmitter circuit. But R77 feedback resistor creating confusion about its working. I know it's acting as a current limiter to the LEDs but confused about ...
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0answers
86 views

Need help with an IR demodulation circuit

I'm trying to reverse engineer a PCB and made a schematic. The bad thing is I only have PCB images from both sides, not the actual PCB. This PCB is used to detect a very small black object spinning at ...
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1answer
75 views

Dual-supply to Single-supply op-amp conversion

I'm building an op-amp circuit that takes my electric guitar signal shifts the voltage from -1.5V to 1.5V to a 0-3V. I have this circuit that works perfectly with a dual supply op amp in multisim, but ...
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1answer
47 views

Differentiator Op-Amp Circuit not giving correct output using single power rail

Im trying to simulate an differentiator Op-Amp using a single supply and the LM324 opamp. I built the differentiator circuit using a voltage divider and the LM3234 opamp. The input wave is a ...
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1answer
37 views

Inverting Amplifier Circuit using Single Power Rail

For my homework, we are supposed to simulate an inverting and noninverting amplifier using a single supply and the LM324 opamp. I built the inverting amplifier using a voltage divider, but my output ...
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2answers
92 views

Op amp controlled LED current

I'm trying to implement a simple current control circuit for an LED from here: https://www.allaboutcircuits.com/technical-articles/the-basics-behind-constant-current-led-drive-circuitry/ The ...
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1answer
58 views

MCP6001 op-amp unable to drive LED when configured as inverting buffer?

I built this circuit on breadboard and came across a problem: I'm using the MCP6001 op-amp with a single supply, configured as an inverting buffer. That's why I connected the non-inverting input to a ...
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1answer
58 views

Noise generated in 2nd stage of active bandpass filter

I'm breadboarding a two-stage inverting amp/filter to amplify a radar signal, using the TLV2464 opamp. My first stage has a gain of 45dB, the second stage 35dB. The input will be a radar signal which ...
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1answer
74 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
96 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
72 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
217 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
91 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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2answers
174 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
49 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
92 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
78 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
59 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
52 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
24 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
269 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
70 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
138 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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226 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
79 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
66 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
161 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
44 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
481 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
129 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
113 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
289 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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2answers
187 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
332 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
73 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
88 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
161 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
48 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 ...
2
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2answers
465 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
167 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?
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1answer
459 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 ...