# Questions tagged [virtual-ground]

In electronics, a virtual ground (or virtual earth) is a node of a circuit that is maintained at a steady reference potential, without being connected directly to the reference potential.

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### How to connect an electrode to ground?

I have an array of 16 electrodes that I want to be disconnected from everything until selected and then connected to ground, one at a time. Would a multiplexer work for this? My application is sensing ...
324 views

### How to isolate audio signals from each other using op-amps with the same single supply?

Reuploaded corrected picture, as the old one was with confusing ground connections: I am new here, so please be patient if I'm doing something wrong. I really need some help as I can't figure it out ...
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### Logic translator between different ground references

I need to translate a 1.8 V digital signal ("power good" from a DC-DC converter) from a "floating" voltage domain to a 3.3 V signal referenced to a fixed system ground. The source ...
154 views

### Ground fault detection on an ROV

I'm helping my friend's kid with a school project where their team has to produce a small ROV. Most of their design I was able to review and help make corrections with them but I'm stumped at one ...
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### Why, in a negative feedback amplifier, do the op-amp input terminals become virtually connected?

The equation from the model of the functionality of the op-amp is that $$V_{out}=A_{0}(V^{+}-V^{-})$$ In case of negative feedback, $V^{+}=V^{-}$. Why do the two terminals in case of negative ...
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### Why is the inverting gain of this phase shift oscillator 8?

In this oscillator configuration, which I got from the textbook "Operational Amplifiers & Linear Integrated Circuits" by James Fiore (page 354, 3rd edition), since the gain of the ladder ...
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### Why is the opamp's inverting input not at virtual ground?

I've have been trying to make a current to voltage converter using a transimpedance amplifier circuit. I have been simulating the circuit in LTspice and everything seems fine, but when I built the ...
312 views

### Conception of an inverting op-amp with a specific gain

Consider the following circuit: Consider the input voltage is $v_1 = 0.1 \sin(\omega t)$ with maximal current $5 \mu A$. I am asked to manipulate the circuit such that the gain is of \\$ A_v = -...
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### What does this op amp circuit do and why is Vout considered to be "virtual ground"?

Can someone identify this op-amp circuit? What is it called, how does it work? Vout is also called virtual ground. simulate this circuit – Schematic created using CircuitLab
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I'm having a problem with my AD8426 instrumental amplifier design. As I show in the image, I use a 3.3 V supply and after increasing my input signal, I use 1.8V virtual ground to make it oscillate on ...
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### Can I use a TL072 to make an artificial ground

I have a microcontroller which has an analog output which I can set anywhere between 0V and 3.3V. I use this to drive one side of a TL072, configured as a voltage follower. The microcontroller and ...
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### How does MOSFET create a ground for inverter chip in this circuit

I am building an interface to a water leak sensor and after having some issues, drew the circuit diagram from an actual board to see how it works. When contacts Sens+ and Sens- are shorted together, ...
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### How to create a voltage divider for different (changing in time) loads?

What I need basically is to create a -12V - 0V - 12V power supply from a 0 - 24V DC supply. The problem is I can't just make a voltage divider because the loads on each part is changing in time. I ...
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154 views

### Opamp virtual ground when power is removed

Does the virtual ground condition hold true when I cut off the power supply of the opamp? I am using an opamp as a buffer. If I cut off the power supply but continue to give a signal on the non-...
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### Different Ground reference

I plan on making my own BMS for a 12S battery pack, and I found TI's TIDA BMS board and decided to use it as a reference to gain some understanding on how to develop safety circuit for the board. ...
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### Can the 5V and the 12V rail on a PC PSU share the ground pin? Proprietary -> standard ARGB fan connectors

I use 6 PC case fans which I want to get out of their proprietary 6pin connection. They are made by the budget fan manufacturer Asiahorse and connect to one of their hubs right now. But the topic ...
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### Different grounds for sensor power and reading

First of all, I'm pretty new in this area of electronic circuit design so I might end up saying something pretty dumb in the course of my question. Also, English is not my native language, so sorry ...
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### Bias for single supply OA

simulate this circuit – Schematic created using CircuitLab I am supplying an audio circuit with only a positive voltage of 12V. I have created a mid point (aka virtual ground, aka bias...) of ...
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### Virtual ground in non inverting op amp

Why is the voltage not equal in inverting and non-inverting terminals in a non-inverting opamp? During the derivation, we take two different V1 and V2. Why doesn't virtual ground apply here?
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### Single supply op-amp

In this example, there is a "A TLV2461 operational amplifier IC is connected to provide a virtual ground for proper operation of the TLC074 from a single supply voltage." I don´t quite ...
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### Conditioning inputs and outputs when using virtual ground

I am using a 120 VAC to 30 VDC single-sided supply to power a synthesizer that requires double ended power supplies, +/-15 V. I am using a TLE2426 rail splitter to create a virtual ground, then ...
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### Using 12V output as ground in 24V power supply to form +/-12V rails

I have a power supply which outputs both +12V and +24V, Here's a photo: Can I use the +12V as ground in my circuit to have a -12V(from 0V)/+12V(from 24V) output? The load on the -12V output will be ~...
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### Replacing a virtual ground circuit with center tapped transformer

I just bought a cheap headphone amp (those 47 Amp). I aiming to replace the voltage-divider-virtual-ground circuit with a 12v-0v-12v transformer (ofc with rectification). I checked the NE5532's VCC+'s ...
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### Op-amp based virtual ground with BJT buffer

I have a line-level audio circuit (2-channel balanced to unbalanced input circuit feeding a stereo volume control IC feeding a 2-channel unbalanced to balanced output circuit) which needs a dual PSU (±...
1 vote
483 views

### Virtual ground circuit capacitor's function?

What is the function of the capacitors in this virtual ground circuit? I've read on the fly that C75 is to maintain a linear impedance for higher frequencies, but under which conditions I don't know. ...
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### Current through virtual ground in op-amps

I am currently trying to understand op-amps. I found a video on youtube about I to V convertor and I am wondering since we have a virtual ground, due to $$V_1 = V_2$$ and then there is ground right ...
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### Configuration of power rail and DC to DC converters on design with li-ion cell's virtual ground

I need to isolate the two Li-ion cells from the circuit when they get charged from USB, otherwise I have grounding/shorting issues because I use a virtual ground to obtain a split supply. I thought to ...
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### Multiple ground

In my design I have four different ground: Ground: from USB for step up and battery charger IC. Ground1: for a split supply (virtual ground). Ground2: for the input signal reference. Ground3: for the ...
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### Voltage follower for signal generator ground issue?

I'm trying to amplify the signal from a signal generator to get a high frequency AC current in a resistor. My circuit is below. However whatever voltage I put on the signal, the output seems to be ~3....
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### Understanding ground when using a USB vs a benchtop oscilloscope

I am trying to understand how a USB oscilloscope can furnish a proper ground from which to take measurements. If I'm not mistaken, my benchtop scope which is powered by my wall outlet at AC 120V, has ...
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### How do I create ground voltage for my op-amp?

I am trying to create a practical Wien Bridge Oscillator and I created a simulation for it. Everything works fine in the simulation. Then I proceed the real part. Since I have only one power supply, I ...
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### Op amp Power supply splitter with totem pole

I want to make a +/- 2.5 V rail from a 5 V supply using an op-amp. I was wondering if I could use a totem pole for driving the output like this: Image from here But while I was looking at it, I ...
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### Virtual ground concept in electronic circuit

This is my current sense circuit that I connect to Arduino in order to measure how much current a load draws. As you can see at the bottom of the image there is a -5 V voltage source connected to the ...
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### Common ground in low side current sensing

I've asked this question a while back and user/Transistor told me that the circuit will be floating and drift without a common ground, he suggested a virtual ground. but in this case we already have a ...
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### Virtual ground vs voltage reference

I want to know what is different between voltage reference and virtual ground and can you use both of it as rail-splitter in transimpedance amplifier, if not why. All I know is Virtual ground chips ...
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### What does this rail-splitter-like circuit do?

I'm repairing an audio amplifier for a car. It has a switching supply that generates +/- 50V rails from the ~12V battery. In the output section of the amplifier, I found this small circuit with ...
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### Virtual ground supply for audio-applications

The most common solution to provide positive and negative voltage to supply an OP-amp would be to use a voltage divider and another OP-amp. In this way the voltage "on the top" of the ...
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### Differential amplifier and different ground

I am designing a circuit to measure the voltage across the output of buck converter. With different ground for the buck converter and the micro controller, with respect to which ground will the ADC ...
1 vote
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### Connect a DC/DC converter to a virtual precision ground in KiCad

I'm trying to design a circuit which steps up 5V to 12V using a DC/DC converter and then use a virtual precision ground TLE2426 to split the 12v to +/-6V. I'm using this design in KiCad: I'm having ...
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### Operational Amplifier - Virtual ground

In the question above I was asked to solve the general shape of Vout, and the exact values in t=0.5ms,1ms. My question is - can I approximate a constant virtual ground in the negative input of the ...
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### Op-Amp Integrator's virtual ground

I have been using op-amp TL072C in charge integrator configuration. R = 1k Ohms and C = 100 uF. Vin is a DC signal of 1 V. VCC = 10 V and VSS = -10 V. I get the expected output which is VSS, when a ...
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### Two power supplies with different current in series

Does the schematic in the picture work with these powersupplies from China? Both are rated with 5V but one with 20 amperes and the other with 2 amperes. https://www.aliexpress.com/item/33042313383....
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### What is the difference between real ground and virtual ground in opamp?

I understand what a real ground for a Opamp is.It is a terminal which is physically connected to ground or earth which acts as the reference point for the entire circuit. But what do we mean by a ...
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### What causes a voltage drop at the input of this TL082CP Op-Amp?

I am breadboarding a circuit using a TL082CP Op-Amp, and I am reading consistent values with the multimeter. The Op-Amp stage is powered with a single 9V battery, like this: The Op-Amp stage looks ...
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### Should I connect metal enclosure to -V or to virtual ground?

I've built a headphone amplifier powered by a switch-mode 2-pin wall wart power supply. Internally a virtual ground is created by dividing and buffering the supply voltage. Input and output signals ...
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### How to make a simple negative power supply

I want to experiment with amplifiers but I need a negative power voltage source. I looked for some circuits but as far as I found they either are not simple & reliable or require an IC. Is there ...
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### 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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### Transistor getting hot in rail splitter circuit

I designed and prototyped the circuit below. The circuit works as expected but Q2 is getting really hot during operation. I simulated it in LTSpice and saw that Q2 draws more current but the range is ...
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