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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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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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51 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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54 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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123 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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45 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
55 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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34 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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20 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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AC/DC Power Supply for Micro Nano reading Flow Sensor Via ADC

I'm using a NANO board with a ATMEGA328p to translate a linear voltage output from a flow sensor. Its a very simple implementation that reads the ADC pin and creates a calculated pulse signal on ...
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2answers
65 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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110 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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39 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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55 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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0answers
27 views

Capacitive Touch Arduino [duplicate]

I am trying to simulate a touch on my iPhone. My understanding of capacitive touch simulation is that a conductive material that touches the screen has to be connected to ground to pull some ...
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1answer
43 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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67 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
179 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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63 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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28 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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27 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
63 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
102 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
41 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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103 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
38 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:...
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104 views

Why is it better to use this Opto-coupler to drive the gate of a FET than using other methods?

My question is what significant advantage does using this HCPL3180 opto-coupler have to drive the gate of an FET over using other methods, such as using an op-amp or BJTs ??? and also does it have ...
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20 views

SIM800L short circuit between VCC, GND and NET

I've soldered my SIM800L module like this. When I'm checking with multi-meter, I'm getting a short circuit between VCC, GND and NET. Why this is happening?
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52 views

Heaphone amplifier PSU noise

I built myself a headphone amplifier using the LM49600 and a PGA2310 for volume control. This part of the circuit is fairly standard and I don't think it's the problem. I wanted it to be powered by a ...
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68 views

Connecting the Chassis Ground and Signal Ground in my PCB

I have been reading alot of questions on this site to clear my understanding on Chassis, Signal Ground, ...
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2answers
70 views

Not Understanding Grounding in an Electrical Circuit

This might be a stupid question but i am just a little confused about grounding/earthing. Specifically for example in a home when some electrical appliance faults, the current will go to ground since ...
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1answer
71 views

USB ground wire — Where does the voltage go?

I am trying to figure out where exactly the current of the ground wire of a USB 2.0 cable goes? I am referring to the pin number 4. I know that normally, the current flowing on the ground wire ...
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2answers
72 views

~36 volts on Neutral <-> Ground

I'm trying to understand what is going on here - this is in a normal house linked to the grid (240 volts / 3 phase), nothing extra. On two sets of plugs (next to each other), I measure 36 volts ...
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45 views

my i2s audio signal is not working. i expect this has something to do with ground and resistors, but i need some help with the details

I am more familiar with software, but I have a project going on that has a tiny amount of hardware involved. I would really appreciate some help with this part. I have existing hardware that has a ...
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1answer
89 views

Odd voltage readings between phase-ground, phase-neutral, neutral-ground

Recently i tried gathering voltages from few AC outlets in my house. I got following readings using a dmm Phase-Ground = 398V-400V (should be around 240V) Phase-Neutral = 230 V Neutral-Ground= 210 V ...
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2answers
106 views

Ferrite bead in Ground path of Input Power Supply

I have been following the schematics of Colibri Toradex Carrer Board. I have used most of the components from their design. However, they have used ferrite beads in Positive terminal and Ground ...
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1answer
66 views

Earth Ground Portable Generator

I recently bought a pure sine wave 2kV portable generator to use for camping. In the manual it states that the generator should be grounded to actual earth through a metal stake and then attached to ...
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44 views

Why doesn't current leak to ground (DC)? [duplicate]

In the circuit shown below, I am considering ground to be ideal earth ground (stays at 0V no matter how much current it absorbs). It is my understanding that current flows when there is a potential ...
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17 views

Can a power surge have a different effect on a led driver when floating?

I have a LED driver which has 3 connections on the AC side , L,N and ground. In the event of power surge, can there be a difference in effect if the GND connection of the LED driver is floating or ...
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108 views

why current flow through ground wires of submersible 3 phase motor?

I have a 150 KW 3-phase submersible motor with 2 cables. Each cable is (3p + 1 ground). When connected the 2 ground wires at the same point, I read about 15 A on the ground cable. Why current flow ...
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355 views

Do I need to split my GND lines?

I am intending to make a multiplexed LED matrix, possibly with 16 rows, 8 columns. This means maximum 16 LEDs (one full row) will be lit at the same time, thus 16 LEDs * 20 mA/LED = 320 mA. According ...
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92 views

How big does ground need to be? Step down from 5v10a to 1.2V 50a, do I need a 50 amp ground?

I'm just a layman. I was just thinking about CPUs in computers. They run at about 1, 1.5 volts or there about, sometimes even lower. Desktop cpus can take 90 watts, some 120 watts. That's close to 100 ...
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1answer
150 views

Measured continuity between live and neutral

I was trying to get rid of the humming noise coming from my speakers in my hi-fi system. It is an old piece of equipment from back when the UK appliances did not come with the mains plug and you had ...
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2answers
78 views

Power tool safety: Grounding v/s Double insulation

OSHA regulation 29 CFR 1926.404(f)(7)(iv) states that electric power tools must be grounded except when they are double insulated. I quote from the Black & Decker rotary drill manual: "Do not use ...
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129 views

Any trick to use the ground pin? [closed]

I have bought a new charger for my laptop. The case of my laptop is made of steel and so it sometimes give electric shock as I don't have a ground wire in my house. And, I currently don't have any ...
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42 views

Opto-coupler and switching digital pins

I'm a total noob when it comes to the use of opto-couplers, but I'm trying to connect up a couple of digital pins between an ESP32 and a small voice module. There are two pins that I need to switch ...
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43 views

Calculate ground fault current leak on human contact

I am sure this is very very simple and probably realy dumb but I've been banging my head for hours and can't figure this out. Or find an answer on google/books for that matter. Even with the diagram ...
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43 views

Another ground question…plastic case with metal front panel, ethernet, connectors

I'm currently designing a board that will have: a primary power supply of 24VDC from an external converter a shielded Ethernet connector two BNC connectors (for two +/-10V signal, 14 bits, <100Hz) ...
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42 views

Separate ground for gate opener control box?

Is it worth electrically isolating the control box of a gate opener from a well grounded steel fence? Or does the grounding of the fence have the same effect? My house is in a very lightning prone ...
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2answers
64 views

Are the ground wires and the earth creating a loop in this system?

Below in the photo both SMPS power supplies powers some DAQ boards. I named them as 12V PSU1 and 5V PSU2. As you see the PSU1 and PSU2 are daisy chained at their mains entry(line, neutral, earth): ...
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32 views

What would happen if you measured voltage between power strip GND/neutral an external object?

Probably a totally stupid question but I'm a novice trying to understand fundamentals. If I stuck one multimeter test lead into ground or neutral on a live power strip with some things plugged in, ...