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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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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3 answers
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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 (±...
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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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75 views

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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1 answer
282 views

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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2 answers
192 views

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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3 answers
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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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1 answer
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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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2 votes
1 answer
243 views

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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1 answer
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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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3 answers
429 views

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 ...
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1 answer
159 views

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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3 votes
2 answers
107 views

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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2 votes
7 answers
2k views

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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1 answer
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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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2 votes
3 answers
521 views

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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6 votes
5 answers
8k views

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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2 votes
1 answer
330 views

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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4 votes
2 answers
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Voltage Balun 1:1

somewhere I have seen that it is possible to build a Balun by using a transformer in the following way: The explanation I have found is that the fact that the ground is only at the primary coil will ...
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Is it right to define ground as a pool of surplus free electrons, like a metal?

In a dipole antenna or any other pole like antenna, there is supposedly a ground on one side causing the current to flow away and towards the ground towards the feed, but if the whole antenna itself ...
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2 votes
2 answers
1k views

What is the correct schematic symbol to use for virtual ground?

I'm following the design of a circuit requiring a power supply to provide something the author calls virtual ground, \$V_{gnd}\$. The circuit look like this: However, I'm using KiCad for the design ...
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What happens if output voltage is connected to OPAMP operating in negative feedback? [closed]

simulate this circuit – Schematic created using CircuitLab I need to anlayse state of OPAMP for V1=1V ,10V ,15V ,40V Its not ptractical problem just want to learn what happens if a voltage ...
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1 vote
1 answer
196 views

Creating Neutral node on Three phase Inverter

I want to create a neutral node at the output of a 3-phase Inverter for ACIM. Is it possible to do that by adding 3 resistors at the Inverter outputs and join them together to get the neutral node? ...
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Single supply opamp colpitts oscillator

I'm designing a Colpitts oscillator with a single supply rail-to-rail opamp powered with 3.3 V. The positive input of the opamp is set to VDD/2 to offset the negative part of the oscillations so ...
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17 votes
7 answers
12k views

How make a dual +-12V supply from a 24V SMPS

I'm trying to power a home-made load cell transmitter using a 24V single SMPS. I need to make +12, 0 and -12 Volts that are capable of 50mA. I wish to power multiple channels of opamps and bridges. I ...
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1 vote
2 answers
2k views

Virtual Short Concept in an Op-Amp

By virtue of the open-loop gain being infinity for an ideal op-amp, the two input terminals are said to be virtually shorted. Yet, the virtual short concept is only applied to op-amps in negative ...
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3 answers
445 views

Voltage gradient across an antenna (and how it drives an AM radio)

Edit: I was interested how is voltage gap maintained across an antenna. It seemed to me that an antenna might be like a wire where if there's a voltage at the top, the same voltage would be at the ...
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1 answer
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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.
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1 answer
131 views

transimpedance op-amp wrong and random output

from my previous question (this link) i advised to using operational amplifiers to converting current changes to voltage changes then i followed the standard circuit for a transimpedance ...
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1 vote
0 answers
292 views

Would a current feedback op-amp work well as a precision ground reference?

I've been looking into precision ground reference circuits to form ±5V rails from a 10V supply for a project I'm working on, and noticed that current feedback (CFB) op-amps have some desirable ...
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0 votes
1 answer
568 views

How to connect this amplifier to my symmetrical power supply?

I am relatively new to electronics. I have this power supply. It is symmetrical because I need negative voltages to other parts of the circuit. The power supply input J3 receives 18 VDC. The 7806 and ...
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0 votes
1 answer
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Trying to build a symmetrical power supply from a VDC input without the problems of virtual ground

I have built this circuit to supply a few ICs. The problem is that at some point in time the load on the positive site is bigger than on the negative side. So the virtual ground moves towards the ...
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As I increase the volume of this amplifier the sound gets choppy and the negative power supply regulator gets hot as hell

I have designed and built the project below. Open the image on new window or imgur will not let you scale it up and you will not see the components. This is a 4 channel stereo switch. You press the ...
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3 answers
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Power Supply negative voltage as ground and ground

I have a PC PSU and can get GND +5V +12V +3.3V and -3.3V -5V -12V out of it. I need to power a device that needs more than 12V. Am I able to take the -5V as GND and connect +12V to VCC and still use ...
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7 votes
4 answers
3k views

Isolating audio ground between devices

I'm planning a build for a guitar amplifier with 2 stages, the first being a tube pre-amp and the second stage being a solid state amplifier. Both amplifiers will be powered from the same source, a ...
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3 answers
710 views

What is the meaning of "ground" and "-V" in a simple push-pull circuit?

In this simple "push-pull" circuit, there are +V, -V and ground connections. up until now, i always considered ground to be the minus side of the battery. but that is also the way i understand -V, so ...
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How to calculate capacitor and resistors on virtual ground circuit?

How do I calculate the resistors and the capacitor on this circuit, which has ground and virtual ground as you can see? In the second image, how do I find the current I2?
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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 ...
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3 votes
1 answer
300 views

Use of virtual ground to split ground loops?

So I have a "broadband" signal (DC-5MHz) which I'd like to send over coax cable to two other circuits referenced to the same ground. Simply floating the other two circuits is not an option for ...
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1 answer
687 views

Using an interface and virtual ground with a non-isolated power supply

If I use the above rail-splitter with a 24V non-isolated power supply, what can be the problem when used with any load like an opamp ect.? How would the current loop if the power supply is not ...
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1 vote
4 answers
3k views

Operational amplifiers and virtual ground

Could you physically clarify why we use virtual ground in op amps? I have seen the argument that since A(open loop gain) tends to infinity, we need the difference in inputs to tend to zero(to maintain ...
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Does my electric clearing field actually make ions?

I am using an electric clearing field of 15v/10cm (~150V/m) to remove ions from a test chamber, however I'm wondering to what extent the localisation of the field's reference voltage plays a role. ...
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