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.

Filter by
Sorted by
Tagged with
1
vote
1answer
30 views

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 ...
1
vote
3answers
70 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 ...
1
vote
1answer
52 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 ...
3
votes
3answers
83 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 ...
2
votes
7answers
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 ...
0
votes
1answer
73 views

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....
1
vote
3answers
126 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 ...
1
vote
1answer
110 views

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 ...
1
vote
0answers
58 views

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 ...
2
votes
4answers
2k 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 ...
1
vote
1answer
81 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 ...
2
votes
1answer
181 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 ...
4
votes
2answers
2k views

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 ...
0
votes
1answer
42 views

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 ...
2
votes
2answers
486 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 ...
-3
votes
1answer
75 views

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 ...
1
vote
1answer
105 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? ...
0
votes
1answer
258 views

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 ...
18
votes
7answers
8k 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 ...
0
votes
2answers
1k 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 ...
0
votes
3answers
293 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 ...
0
votes
1answer
242 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
1answer
74 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 ...
1
vote
0answers
189 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 ...
0
votes
1answer
351 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 ...
0
votes
1answer
280 views

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 ...
0
votes
1answer
122 views

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 ...
0
votes
3answers
2k views

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 ...
7
votes
4answers
2k 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 ...
0
votes
3answers
345 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 ...
0
votes
1answer
984 views

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?
0
votes
1answer
128 views

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 ...
3
votes
1answer
221 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 ...
0
votes
1answer
452 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 ...
1
vote
4answers
2k 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 ...
0
votes
1answer
76 views

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. ...
-2
votes
1answer
928 views

Problem in using a buffered virtual ground as opamp split supply [closed]

The single-ended to differential converter on the right side works fine in sim only if I set opamp rails Vcc=12V and Vee=-12V as split supply. But if I supply the circuit by using 24V supply and a ...
1
vote
1answer
442 views

What is behavior of this virtual ground circuit when sourcing/sinking current?

simulate this circuit – Schematic created using CircuitLab This is the virtual ground circuit from a battery-powered headphone amplifier(direct link to schematic PDF). What is the behavior of ...
5
votes
1answer
634 views

JFET Burn Out in Wien Bridge Oscillator

I have a simple Wien Bridge Oscillator (with JFET gain control) circuit pictured below. This circuit works as expected at lower voltages (+/-9 V), but I am running into some problems with higher ...
2
votes
0answers
2k views

Why do some audio amplifiers connect the power ground to the signal ground?

Trying to add a MIDI synthesizer & speakers to a keyboard here. Here's the schematic: simulate this circuit – Schematic created using CircuitLab But I was getting annoying crackling and ...
4
votes
2answers
1k 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 ...
1
vote
2answers
486 views

Virtual AC ground for AC power main

I have the following problem: I use to perform electrical experiments in a small room in an apart where other persons repair computers. It sometimes happens that I make the main differential switch ...
11
votes
11answers
4k views

Virtual Ground Paradox?

I'm unable to come to terms with something I think is a paradoxical situation relating to the virtual ground of an Operational Amplifier.Please pardon me if this is a really stupid question. When the ...
2
votes
2answers
359 views

How to split 5V USB input into 4 rails (+/-5V, +/-15V)? Problem with combining two virtual grounds

Problem: I have 5V input from USB, I need to split it into four rails with +/-5V and +/-15V. Currently done: I have built the following circuit in a breadboard. I have measured the outputs with a ...
0
votes
2answers
396 views

Sensing voltage with respect to virtual ground

I want to sense a near-ground voltage in this circuit which is Vsense, but its maximum voltage would be 0.5 V so I designed an op amp amplifier with a gain of 10. I used another op amp to split the ...
1
vote
0answers
466 views

V+, V- and GND - Getting started with virtual grounds

I've been happily playing around with TTL logic but have recently come across an Analog / Digital converter TSC7106 whilst tearing apart an old thermostat which has demanded V+, GND and ... V- :o I ...
0
votes
3answers
911 views

Two grounds when using transistor switching

Background I'm designing a small circuit in which an MCU and all its peripherals should be shut down unless a certain condition is met, which is represented by a switch in this simplified schematic. ...
0
votes
1answer
1k views

Proper biasing to virtual ground with TLE2426

I've made simple circuit - it attenuates the signal 10 times, bare bones voltage divider: simulate this circuit – Schematic created using CircuitLab Now I want to bias the signal to half of my ...
0
votes
2answers
964 views

DC to DC power supply Virtual Ground circuit dillema

I am trying to power a circuit with two op-amps that require multiple voltages. The voltage requirements are -14v, +14v, ground/24+. I am trying to power this circuit from a 12vdc power supply. I am ...
0
votes
3answers
883 views

Can I use one voltage divider to bias multiple points in circuit?

I have 4 nodes in my circuit that require virtual ground of half the power supply voltage. 2 of the nodes are just offset for input signal and other 2 are for op-amp biasing to virtual ground. Can I ...