Ground or earth is the reference point in an electrical circuit from which other voltages are measured, or is a common return path for electric current, or a direct physical connection to the Earth.

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When an isolation transformer is not enough? [on hold]

I work for a fairly large church and we have powered line array speakers that do not have attenuators in them. Over time a ground loop occurred from the stage lighting causing a very distracting ...
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95 views

Is the ground really the ground? [duplicate]

I've always been too embarrassed too ask, but the notion of "ground" has always puzzled me. The way I understand it, in theory, is that the earth acts as a giant sink/pool of electron and thus will ...
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88 views

How does a “break” in the neutral wire enable it to reach the full line voltage?

The answer to Is the neutral wire considered safe? states: When everything is working correctly, it should be at most a few volts from ground. However, and this is the big gotcha, if there is a ...
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42 views

Ground loops on single trace in the middle of a ground plane

I'm trying to optimize the layout of a MAX1979 TEC driver on a double sided PCB. Is the placement of single, small traces in the middle of a ground place, as seen below on the bottom side of the ...
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1answer
10 views

PCM4202 AGNDL/AGNDR connection

First, sorry if my english is not perfect. I have a question regarding AGNDL and AGNDR connectiof for PCM4202 . In the data sheet document ( figure 12, page 21) the decoupling caps are not connected ...
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148 views

Grounding a capacitor?

Noobish question. I'm trying to make a dc variable voltage power supply. I will include the schematic which I am trying to build. In the schematic there are two 1000 uf capacitors which I believe are ...
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1answer
35 views

Why a ground loop a problem, not a ground plane(patch attena)?

The question is as the title says: I see various material saying using a solid ground plane. Why would not that be a problem, since a solid ground plane could be a patch antenna?
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79 views

Differential ADC input buffer

I am trying to make 10Mohm of input impedance into a ADC (CS5530). I am planing to use differential input buffer to ADC so I am trying to use TI's document as reference. I tried the one differential ...
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83 views

Proper PCB grounding with several general purpose ICs

I'm designing a general purpose Arduino shield pcb and right now I'm struggling to find a proper ground layout. ICs on the board: 12->5V and 12->10V @5A switching DCregulators, several H-Bridge motor ...
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105 views

Why are the ground and neutral bonded in my panel?

I took a look inside my panel today and saw a big green wire connected to the neutral bus bar. Why are these two bonded together? Why not just send the neutral back where it came from? Where does the ...
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34 views

Current Return Path for Plasma Experiment

I'm planning to use an old non-GFI neon transformer to produce plasma for some research I'm conducting. However, the neon transformer is center-tapped which complicates diagnostics (such as ground ...
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3answers
80 views

Separating Digital GND from Analog GND

I'm connecting CdS photoresitor and ADC (MCP3204) to the RPi. And MCP has DGND and AGND. I am about to connect both GNDs to the GND on RPi's GPIO, naively. Is that problematic if I want to read the ...
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130 views

How is Ground in a Power Supply made?

I've been using different power supplies for 6 years. But, I'm unable to understand how we make ground in a Power supply? Or from where does this ground come? Or from where does this reference ground ...
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1answer
68 views

Removing neon transformer center tap?

I have recently acquired an old neon transformer (rated 12kV) for conducting some low temperature plasma experiments. It is the mid-point grounded style with a center tap on the secondary coil. I had ...
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1answer
84 views

Buffering Input Signal - Op Amp Alternatives

I need to buffer a 0-5V signal that is coming from a resistor network and being fed into an IC. When I feed it directly to the IC there is a loading effect and the value is changed specifically at 0V ...
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3answers
95 views

How to deal with grounding and the capacitors in this opamp schematic?

Here is a schematic I'm planning to make (right click on the image and 'open image in new tab' to see it better'): I have a transformer and AC to DC converter that makes +/-12V. (1) Does 'power ...
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1answer
81 views

How to implement grounding into this electrical circuit?

I'm trying to make some tutorials but I have no idea what should I do when I see the term ground (GND). Here is an example: I want to know how I build the GND part. Where I connect it? Also, if ...
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59 views

Can ungrounded power line damage computer components & networking devices? [closed]

I live in a rented house and it's electrical wiring doesn't have a ground line. I'm using 3-pin plugs with 2-pin converter. I have desktop computers, laptops, wireless routers, network switches etc ...
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137 views

What were to happen if I short-circuited electricity generated by a power plant to the Earth?

I'm not sure how to word this better, so I hope this makes sense. Let's say theoretically that I connected a cable from the hot side of the power lines that run along the road to a stake in the ...
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1answer
57 views

Patch antenna ground plane

I am designing a four layer board in which a patch antenna is used for a GPS receiver.The antenna's feed is a through hole and reaches the bottom of board, where it meets a 50 ohm transmission ...
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3answers
110 views

Grounding between enclosures in a closed system

Currently we are developing enclosures in an isolated "system of systems". Our overall system is fed AC power and converted to 28V with an off-the-shelf converter. Currently the enclosures we are ...
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3answers
101 views

Ground vs Power Ground

In the MAX1979 datasheet, I see two types of ground specified, analog and power ground. My question is: what exactly is the difference between these grounds (noise? if so, which is noisier?), and more ...
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64 views

Live wire touching ground, sends power back through TV cable [closed]

This bizarre show happened twice at my house. The first time it happened I only realized something was at fault when I was having to call the cable company every two weeks to fix the cable internet. ...
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311 views

Grounding the (unused) power layer of a 4-layer PCB

I'm developing a new PCB and I realized that all my power connections are on one side of the board, easily connected with a wide trace. So, I don't really need the inner power layer of the board. I do ...
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1answer
231 views

What to use as a ground in a plastic, mobile container

I'm building a basic stereo system, using a car stereo and speakers, inside a large plastic box. The stereo requires grounding, but the box is entirely plastic, so there is no metal chassis, and it ...
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2answers
83 views

Obtaining O-Scope signals in a AC/DC supply - grounding issues

I need to check waveforms in the power supply from this design reference by Texas Instruments. I essentially built the supply, but it is not operating correctly - ie, no output current, but it has ...
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77 views

Charge Arduino through Computer but connect to external circuit

I'll explain what I'm trying to achieve first. I basically want to control a 4 wheeled robot through an Arduino but I need the Arduino to get the commands from a computer. I've already setup the ...
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271 views

Why is this ground and resistor connected here after the switches?

I had recently asked a quiestion here: Will this circuit for quiz buzzers work? and I got this answer. I am trying to understand the circuit and I have understood most of it but there is only one ...
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1answer
80 views

Output voltage diagram of a 3-input OR logic gate (using diodes)

Let's say we have a 3-input OR gate (using 3 diodes and a resistor) as follows: A hypothetical input voltages diagram is the following: I want to find the output voltage diagram (voltage Vo) that ...
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2answers
72 views

Kirchhoff's Current Law at the ground node?

Can one do KCL at the ground node? Does any current go into the ground? I think not, but I am not sure. Bonus Question: If yes, then how does grounding buildings drain the current into the Earth?
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131 views

Common vs. ground

I've been trained to use the word ground and the ground symbol to refer to the earth, the dirt on which we stand. Circuit common is considered to be a separate concept, with the symbol . My ...
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1answer
155 views

Difference between virtual and ground plane

Ive created two PCBs, a power board to output a +-5V supply and a midway voltage reference (using the TLE2426) at 0V. This PCB powers a biosignal acquistion board shown in the spice diagram below. ...
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86 views

Sharing negative terminal (“ground”) between 2 LiPo batteries and UBECs / paralleling 2S LiPo packs

One of my projects require a hefty amount of amperage - and as such I want to use 2 LiPo 2S batteries, in parallel. In addition, I am regulating the voltage using multiple DC-DC step down converters ...
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172 views

Operational Amplifier Virtual ground

I know that an op-amp tries to hold the input voltages the same. So, for virtual ground we can connect + node to the ground and we're getting a 0V on the ...
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4answers
161 views

Significance of GND in bridge rectifier

simulate this circuit – Schematic created using CircuitLab In my book, this diagram is used to explain how a bridge rectifier works, in positive and negative half cycles. But it does not ...
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1answer
63 views

Leakage from MOSFET Switch To Ground

I built this circuit at home to for science (I explicitly drew the body diodes for clarity). simulate this circuit – Schematic created using CircuitLab Imagine the following scenario: ...
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42 views

Use Earth and Ground Rods as Tip and Ring for a Modem

My co-worker and I recently tested this theory out with two Cermetek 1794A modems. Datasheet: http://www.cermetek.com/Catalog/High-Speed-Modems/DataSheet/CH1794A_607-0020.pdf Now first, we did two ...
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2answers
102 views

Does signal ground have to be connected to actual ground?

Does signal ground have to be connected to actual ground, or does it simply need to be a common node? I have a number of "floating grounds" in my schematic (denoted by the upside-down triangle) and ...
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3answers
149 views

What do we mean by “ground” in an electrical circuit? [duplicate]

What do we mean by ground in an electrical circuit? When we want to solve electrical circuits problems, we set a "ground" level which is mean that the potential on it equal to $0$. I wonder how the ...
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1answer
41 views

RF Ground (Reflections?)

I'm trying to understand how someone can ground an RF signal (especially relating to microstrip lines). I think I'm missing something... Since the impedance of ground is supposed to be \$0\Omega\$, ...
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135 views

Constant current led drivers shared ground

I have 4 constant current led drivers with PWM. Here's 300-1500mA LED Driver datasheet. I want to use 3 of these drivers to power each color of a 90w rgb led. I was under assumption that I could ...
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1answer
148 views

Shorted antenna DC-blocking capacitor value

I have an antenna that contains a DC short to ground ( a PIFA antenna at 1575 MHz in this case ). However, my device cannot tolerate a DC short to ground, so I need to include a blocking capacitor in ...
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5answers
840 views

Where is the Ground in a Simple Electronic Circuit [duplicate]

I am rather new to electronics, and I am reading up on the topic. I came across the term ground. I get the large scale applications like the wires leading into the ground from power lines, but how is ...
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2answers
271 views

Making a grounded object capacitive

I am trying to make a copper pipe which is placed in a natural park capacitive. It is placed in the soil meaning that it is already grounded. I am using a basic arduino and their capacitive sensing ...
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1answer
160 views

Tying ground planes together with a non-zero Resistor

I was reviewing the schematic of a motor driver board and noticed that the digital and analog grounds are tied together with a 3.9 ohm 1/4 watt resistor. I am still trying to find the gerber files to ...
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1answer
41 views

SPDT Switch in Logisim

How do I implement an SPDT switch in Logisim? I need it for connecting 2 pins to ground but not at the same time.
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2answers
110 views

Charging lead acid (car) batteries with a common ground

I have three identical lead acid batteries. All three batteries are on a common ground since they power different components on a same circuit. I have three independent "intelligent" chargers whose ...
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276 views

Ufer ground in home foundations — NEC code / copper conductors [closed]

Here's the relevant NEC code (2014) for the question I have: NFPA 70 250.52 Grounding Electrodes. (3) Concrete-Encased Electrode. A concrete-encased electrode shall consist of at least 6.0 m (20 ...
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2answers
239 views

Grounded thermocouple vs “grounded” thermocouple

I'm having problems with documentation and what appears to be conflicting use of the word grounded. The way I understand it, a thermocouple can be [grounded, ungrounded, or unsheathed] ...
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167 views

What if I have a voltage between ground neutral? [duplicate]

What does it mean when there is voltage between ground and neutral (220V) and between phase and neutral (220V) but no voltage between phase and ground (0V)? What could happen? Is it safe? Is it ...