# 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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### 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 ...
687 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?
680 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 ...
2k views

### What is the use of an op-amp whose output and inverting input are connected to ground?

I am in first year of Engineering school and I was given an assignment containing this circuit, which drives pressure sensors in a pitot tube : I am struggling to understand the whole circuit, and ...
5k 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 ...
1k views

### Op amp rail splitter virtual ground shifts when LED is on

I have a 9V power supply. I split it in half using a voltage divider buffered through a TL071 op amp. I use the +4.5V rail to power an ATmega328P. The microcontroller has one pin attached to an LED ...
880 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 ...
133 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 ...