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Questions tagged [ground]

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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If battery negative lead is negative voltage(conventional current) or zero volt (ground)?

If the ground is zero volt and we consider battery negative terminal as ground. Then why does the negative voltage affect the circuitry.
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3answers
35 views

phone charger residual electric flow

Not actually sure if this is too simple a question for this exchange. Just now I picked up my phone charger and unplugged it to move somewhere and plugged my phone in to the recently unplugged (from ...
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5answers
75 views

Concept of ground near negative terminal

What's the point of having the ground near the negative terminal when the electrons would just then flow out of the circuit into the ground? Since there is already a potential difference between the ...
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3answers
64 views

Do I need a grounded electrical outlet for a laptop and computer monitor? [closed]

I am currently setup in a room with (2 pin) non grounded outlets (Canada). I am considering setting up my laptop and monitor. What risks would I be taking by not using grounded outlets with these ...
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1answer
57 views

How do laboratory devices (from photo) work with BNC cables, connected to ground

The title is a bit cumbersome because my questions are a bit difficult to describe. Here is a photo from Practical Electronics for Inventors by Paul Scherz I'm curious on a few things: How does the ...
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1answer
25 views

tp4056 dw01 ground isolation

I'm building a solar project to monitor charge current and discharge current as well as lipo 'State Of Charge'. The configuration is a 5V solar panel feeding a TP4056 which B+/- connect to a MAX471 ...
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1answer
36 views

Common/separated ground in dummy load?

My question is simple - maybe silly. I've got 2 circuits: MCU with DAC, ADC and another 3.3V electronics Dummy load (Max 24VDC). Do I need to connect two separate grounds (MCU ground and dummy load ...
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1answer
41 views

Pi Filter Grounding for RF sampling ADC

I am working as an intern at a start up. We have got a project for Data Acquisition system in which we are using three RF sampling ADCs. ADC is ADC12DJ3200 from TI which has 6.4GSPS sampling rate ...
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3answers
68 views

Line to ground faults

I am having a trouble understanding the concept of line to ground faults,and ground in general. In this simple single phase circuit, does current reach the load and the circuit operates normally? ...
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0answers
25 views

How can I test which mains wire belongs to neutral and which to ground? [migrated]

I currently live in Spain, in an old building, where apparently electrical codes don't strictly apply... because not all outlets have ground or, indeed, not all connections are grounded. To make ...
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1answer
21 views

Directional Coupler Terminals

I have a basic question about directional couplers. In this scheme each port is represented by one wire. What does it mean? The other terminal of each port is GND for all?
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2answers
1k views

Learning how to read schematics, questions about fractional voltage in schematic

In a schematic I've been reviewing I see in only one spot that there is a 1/2v going somewhere? What does that mean? simulate this circuit – Schematic created using CircuitLab
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2answers
56 views

Earth line safety [closed]

I am working with a conductive appliance that a user will be in constant contact with over extended periods of time and the appliance is constantly earthed. These two facts cannot change, other than ...
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1answer
79 views

5VDC and 10VAC on the same PCB - what happens on 10V goes to 5V ground?

Me and a colleague (we are both EE-trainees) had a chat the other day about mixed voltages on the same PCB. She pointed out an interesting question that I was not able to solve. Imaging having a PCB ...
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3answers
106 views

Understand ground and ceramic non polarized capacitor

simulate this circuit – Schematic created using CircuitLab I'm trying to learn some basics of electronics. I want to build a circuit for my raspberry with main components to use in programming. ...
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1answer
36 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 ...
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3answers
48 views

Ground attached to negative terminal - where do the electrons come from?

My question pertains to this circuit: Not considering conventional current direction, but rather considering actual electron flow: if the negative terminal is connected to the ground, where do the ...
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2answers
138 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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2answers
424 views

Grounding Vcc and Vee?

I recently started electronics as my hobby. I'm working on this v/oct modular synth and in the schematic that I was working on, it did not make sence to me when all the Vcc and Vee are connected to ...
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1answer
62 views

Isolate two audio inputs to amplifier circuits on ground connection

I am using an arduino to monitor the voltage of the input lines to a stereo amplifier connected to speakers. When the arduino detects voltage changes on Chan1 or Chan2 it activates an IR LED to change ...
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1answer
138 views

PCB ground connection for shared power/data bus system

I have a wireless device that is connected to a shared power and data bus, similar to below. The bus can be shared by up to 5 devices and I don't know what it will be connected in advance. I connect ...
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1answer
44 views

Multiple ground planes, single point ground, and a level shifter

I'm using a level shifter to go from 3.3V to 5V (digital/analog). According to the datasheet, if I put 1 ground on the left side of the IC and the other on the right, it would tie the grounds together ...
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1answer
85 views

Multiple power supply potentials

I am making a Project with an Arduino driving a stepper motor with a driver board. USB will still be connected to send commands over serial. EDIT: I am building an EggBot driver board for my Arduino ...
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1answer
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1answer
52 views

Searching for 'ground fault' on DC power supply, 0VDC to ground

We have 3 chargers for DC power supplies (125VDC battery banks) at our facility and had a contractor come in and test them. They said there is a 'ground fault' on 2 of them in their report. The only ...
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3answers
43 views

Earth Fault in a TT Network: Current loop, or charges flowing from one grounding to the other?

There are serveral things I (yet) don't understand about the T-T-earthing system. The most important one is that I don't understand which way the the current takes in case one of the conductors (for ...
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1answer
51 views

Make ground signal last longer?

I'm trying to figure out a way to make a ground signal last longer on my car. I'll explain what is happening and what needs to be done. I'm hooking up an factory alarm on my car. It uses a negative ...
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1answer
36 views

Protective-Earthing the chassis with the earthing point being the star-point - How does it keep the Chassis at Earth potential?

I always understood that one of the two purposes of protective earthing is keeping the electric potential difference between the chassis of a devide and the ground (the ground I am standing uppon ...
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1answer
82 views

How does a ground node affect this circuits equivalent resistance?

I'm new to circuit analysis and I bumped into this problem that Im not sure how to solve. Originally the exercise had two ground nodes at the same ground level but I saw a thread that said that it ...
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1answer
57 views

Voltage on the grounded conductive devices when plugging in non-grounded outlet [duplicate]

Most outlets in my house are non-grounded (line and neutral contacts only). I just bought a Hakko fx-888d soldering station, and immediately noticed that touching the iron-station cable gives the same ...
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2answers
140 views

Is it a good idea to ground a heat sink?

Have a nice piece of Motorola obtainium that I want to use to power a Raspberry Pi, and I also happen to have a left over ground wire (the case has a three-lead power connector). The case is 100% ...
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1answer
65 views

How the diode mode of a multimeter works

First of all, I'm new to board repair, but I would like to learn more so I decided to watch a lot of videos to learn. However, I can't find any answer to the questions below about the diode mode. ...
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4answers
78 views

Floating Source Voltage Difference to Earth

I was reading about floating voltage on web but there is something that I couldn't understand. I attached photo of circuit. As you see it shows 60v difference between neutral of flating source and ...
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0answers
43 views

Reading Digital and Analog Signal from Different Sources with Arduino

I am using an Arduino to read signals from 2 different devices. (This is an automotive project so all 3 are powered by the 12v battery of the car). The signal from one of the devices is a digital ...
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0answers
21 views

Eagle PCB GND planes not show after ratsnest command

I poured my polygons on both TOP and BOTTOM layers ,but after i name them and click ratsnest the GND planes don't show up. The autorouter didn't want to route as it was stuck at 00.0% and finished ...
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2answers
121 views

Ground Plane on Top and Bottom layers in 4-layer PCBs

Is it a good idea to fill free space on Top and Bottom layers in a multilayer (4-layer or more) PCB? I usually use external layers for signal routing and internal layers for power supplies and ground....
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1answer
120 views

Shaping ground plane on a 4 layer USB Midi controller PCB

I have asked about this before but I have to admit that I didn't read enough before asking and therefore was'nt able to ask the question properly. I hope I am now. I'm designing a 4 layer board with ...
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0answers
51 views

Weird SWD debug port behaviour

Today I have started to encounter strange problems with SWD debugging. The debug only works if I keep my finger on the SWD pins. To be more interesting I have the same problem with the boards I was ...
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3answers
81 views

Question regarding ground when using teensy to control a mosfet switch

Despite the fact that I'm pretty new to electronics I'm working on a quite ambitious project which is basically a USB-Midi Controller attached to different devices that send different signals. The ...
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1answer
48 views

how to make different grounding

yesterday when i ask about driving circuit, someone told me that it is a little use in optocoupler when i use the same ground everywhere. because so far (iam a green hand in electronic) i just connect ...
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0answers
92 views

adding an antenna to a toy PCB, where can I ground it? is the negative battery cable ok?

I want to replace the antenna on my toy quadcopter with a better one, to improve reception. On toy quadcopters the antenna is just a simple wire soldered to the quadcopter circuit board (with no ...
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2answers
192 views

(Not) Impossible to separate AGND from DGND

I'm designing a USB-MIDI board and I decided to go for 4 layers. Since the digital and analog inputs (i.e. potentiometers and momentary push buttons) are distributed throughout the board, it's ...
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1answer
66 views

Questions about grounding points for an analog signal transmission

I'm planning to implement the following circuit I have drawn. But because there is no SPICE for such components I couldn't verify or test any overall workings. From left to right I will first ...
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0answers
32 views

Interference on car bluetooth system

I just did some work on my car audio system and am having some problems with interference. I added a bluetooth receiver and wired it directly to my stereo cd player input. The receiver is powered from ...
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1answer
50 views

Soldering Iron and Electrostatic Bracelet Connection

I have a DIY soldering station and I want to ground the soldering iron and I also want to use a electrostatic bracelet connector for the soldering station. Can you please help me how to connect the ...
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1answer
121 views

Proper Chassis Grounding

I'm starting to design things that run off mains voltage and I want to be sure that I have a proper connection from my chassis to earth ground. I've been reading a bit about proper grounding and have ...
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2answers
119 views

Ground, common, and Earth ground confusion

I am learning on transmitters and input modules nowadays. But the usage of word 'ground' is confusing me. What does 'ground' mean there (earth or power supply common)? If it is earth ground, why we ...
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1answer
45 views

What would cause a voltage rail to be held low without measuring a short circuit?

I have a circuit that provides power (1.8VD) to an FPGA and some ADCs. I have seen in the past where damage (ESD, EOS, etc) occurs to one of the ADCs. This causes a short from 1.8VD to GND internal to ...
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3answers
118 views

Multiple different grounds in one diagram

Assume I have multiple electronic circuits and I need to display them working together. Each of them has a common ground symbol. However, the different grounds of the different circuits are not ...
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1answer
42 views

Ground-referenced current mirror with low voltage drop

The following circuit produces a voltage v2 that is the logarithm of I[dut]. I've modeled it with I1 ranging from 1uA to 100mA and it does essentially what I want, but it could stand some improvement:...