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Questions tagged [grounding]

Problems related to the connection of circuits to ground or earth references. Can affect safety, accuracy, reliability and interfacing.

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2answers
120 views

Ground Plane Net Tie - Question about current design

I am doing net-tie method to separate two different Ground Planes (for noise mitigation purpose), one ground plane is for RF circuitry and MCU, the other ground plane is for power and motor switching. ...
2
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1answer
77 views

Tuning Fork Crystal grounding

This post is very helpful, but I'm still a little unsure about my crystal layout. This is a 4-layer board with top_signal->ground->+5V->bottom_signal stackup. The crystal is a 32.767KHz tuning fork ...
2
votes
1answer
390 views

SD card connector chassis grounding

I have been designing a PCB which includes an SD card connector. As I'm not a PCB designer expert, I was looking for a reference design when I came across with the circuit bellow, extracted from Texas ...
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2answers
274 views

VGA cable arcing against computer case

I've tried to turn on my old PC with my old LCD monitor, which is powered by a kettle cable directly from mains, no power supply brick). When trying to get it to work, I have noticed the following ...
3
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5answers
178 views

Grounding conductor meant to protect electrical devices?

I had a home inspection performed on an old house recently. The inspector noticed that some of the outlets had an unconnected third prong. He told me that the absence of a grounding conductor on the ...
2
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3answers
1k views

Should cable shields be connected to earth ground, or to power supply negative?

I'm working on a PLC cabinet, and I'm wondering whether I should hook cable shields to earth ground, or to the power supply negative. I checked and the power supply DC output is isolated. There's no ...
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1answer
63 views

Earthing circuit ground [closed]

what is the benefit of connecting DC ground terminal to the Earth in AC to DC converter?
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0answers
376 views

Connecting Protective Earth (PE) to DC ground

This question has a bit of application background so please bear with me: I'm working on a LED lighting system. The controller (MCU, led drivers and led supply) will be powered by a single DC ...
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2answers
118 views

480v delta/400v wye with Neutral ungrounded

I have a European machine using a 480/400 volt three phase transformer. The neutral conductor is used to power some devices at 230 volt. The manuf. insists that the neutral must not be solidly ...
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1answer
103 views

How to measure signal from common-source N-MOSFET with ground-referenced oscilloscope?

Update: It was the LED on the load that dropped the voltage. I have problem measuring the voltage of signal from common-source N-MOSFET switch. Everything including o-scope is grounded and there is ...
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0answers
81 views

No grounding system available for oscilloscope, what other options are available?

Many old buildings/houses in Europe are so old that they were not built with a grounding system. I happen to live in one were this is the case. The problem is that if I want to use an oscilloscope, it ...
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1answer
121 views

Question about ESD wristband and lightning

as far as I know all ESD wristband's ground connection has an 1M ohm resistor built in for safety. So what would happen if I am working on lab wearing ESD wristband which is connected to the home ...
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1answer
217 views

SMPS output grounding (PE)

I am designing an ultralow noise 5V/3A SMPS. On the DC side, I see the ground (DC) is earthed (chassis ground) using a direct connection 0 ohm or using a Y capacitor. What are the differences between ...
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2answers
1k views

Were do ground pins on isolation transformer go [closed]

The outputs from transformer have a ground. Is output ground earth ground? Isn't the whole point for those transformers not to provide earth ground potential? Example:
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3answers
954 views

Can a generator give me shock?

Can an isolated AC system like a generator which is not system grounded will be able to give me a shock if I touch it one wire? I guess it should not, because then there would not be a path back to ...
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1answer
314 views

SMPS chassis ground and earth ground

I'm designing a ultra low noise smps and I have some questions about ground/earth chassis. The main goal is very low noise on DC output. Earth (PE) should be connected to one point (only) to the ...
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2answers
526 views

Metal detector coil SHIELDING?

Many designs of coils, of metal detectors, are shielded (Faraday shield). Should this be used in a gravity-fed detector (like the sketched one)? What's the shield for? NOTE: The coils are arranged ...
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2answers
180 views

Earthing Bracelet safety

I have a family friend which likes to sleep with a direct connection to earth. This question is purely to do with safety, nothing to do with what you or I or anyone for that matter believes about this ...
2
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1answer
154 views

Is there any technical/safety reason to ground off-grid solar?

Unlike this similar unanswered question I will keep this question here focused and specific. Imagine an off-grid solar system: panels, charge controller, battery, inverter, AC and DC appliances. ...
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1answer
219 views

Making 2 layer board, using ground pour when I already use ground plane?

I'm working on a project were we are making PCB for measuring weight with 24-bit ADC (AD7792), MCU and GSM module. Because those measurements are highly sensitive, we are considering AGND and DGND ...
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1answer
70 views

Earth& neutral voltage detection

Can someone suggest me circuit to detect the earth to neutral voltage. I would like to trip relay coil using microcontroller if earth to neutral voltage exceeds 3v. There are device RCB and RCBO ...
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1answer
88 views

How to remove buzz from piezo speaker pickup?

I am using piezo speakers as pickup for my guitar. In one setup, for an amp, I have a 25 year old Philips powerhouse aw636 stereo, which has a mic in. The problem is that when I connect the piezo to ...
3
votes
1answer
588 views

Double isolation with earthing symbol inside on power supply

I was looking at my laptop's power supply and i noticed this symbol: To me totally looks like a "double isolation class 2" IEC 61140 combined with the IEC 60417 - 5018 symbol (Functional earthing; ...
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1answer
84 views

Measuring potential between two pins below ground

I am trying to use a Raspberry Pi to measure the amperage used by a boat's electrical system. The boat has a shunt pre-installed just before the battery ground. I have a Pi with an ADC installed ...
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1answer
91 views

Protective earth bonding for multiple AC-DC PSUs

I'm building an LED curtain, and trying to make it as safe as I can in limited time. We're using WS2812B strips driven off 3 Fadecandy boards. I've got 3x Mean Well RSP-150-5 AC-DC PSUs (Datasheet: ...
1
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2answers
206 views

Audio output referenced to Vcc

I'm building a Stepped Tone Generator (AKA Atari Punk Console (APC)) based circuit, which is not a stand alone device, but which will feed into a number of subsequent stages/circuits. The majority of ...
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2answers
346 views

Grounding A Faraday Cage On The Seventh Floor

I am working on a project for my physics class to test the resistance of various flames. This will involve using a spark gap with high voltage and I am in the process of building a small Faraday Cage ...
1
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1answer
118 views

Grounding an Enclosure

I have been working on a hi-fi audio amplifier, and I plan to put it in a metal enclosure when it is finished. The amplifier is (relatively) low power, so I'm powering the system from a wall-wart ...
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1answer
108 views

How does circuit completes when physical ground(earth) is used as neutral? [duplicate]

In my locality there is no neutral wire. Our transmission company runs only 3 wires(all line/phase) and no neutral(4th wire) at all. Out of three, one runs to our houses. I know it sounds incorrect, ...
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3answers
728 views

TT Earthing System [closed]

Ok guys I can't just understand a thing of the TT Earthing System, why on it the ground of the power cabin is connected to the neutral of the power cabin?
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0answers
25 views

Proper way for best fidelity to ground 1980's pro audio mixer, will grounding to the case create noise?

love this forum, this is my first post so "beer" with me. I am modding an old 1989 tascam mixer. I know its probably easier to just buy something nicer, but I got it for free and I want to use it as ...
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2answers
492 views

Connect two lab bench power supplies in series safely

Lets assume in European Union, that I have two power supplies, that each have 3 terminals. One marked +, second - and third GND. I assume that GND is connected to the protective earth of AC power cord ...
-1
votes
1answer
159 views

Earthing resistance [closed]

I don't understand a thing about ground resistance. Let's say that the power plant servicing my house is placed at a distance of 100 meters from it. If we hypothesize a resistivity of 100 Ω*m, the ...
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2answers
295 views

Multiboard Grounding In High Frequency

How can ground loop be avoided when connecting two system with same ground. This happen in PC whith SATA cable or PCIe Card with seprated power cable. My System Board: I have two pcb each with a ...
2
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3answers
607 views

Why is it important, in terms of ESD protection, to ground a PCB to its case (if not insulative)?

I have a 12V DC-powered SBC to mount inside a metal case. How important is it that I connect its ground(?) to the metal case on the interior? How is this going to protect against ESD events? From my ...
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1answer
32 views

Mixed-Signal modular system grounding scheme

I'm attempting to create a sensitive, precise mixed signal system (more than 24bit) compose of a backplane and stacked modules on 2.54mm headers.It is multi-channel and channel's modules are well ...
0
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1answer
313 views

Sparks when plugging in USB

I've created a simple controller with a nodemcu to connect a RGB strip that I had to the internet. The thing that happens is that when I go to plug in the nodemcu to my iMac(to power the nodemcu), I ...
5
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1answer
2k views

RS-485 shield and ground wiring practice

After some reading I was convinced that I have three options: The best: connect A and B lines to a twisted pair, signal ground (SG) line to therd wire in the cable (or to a second twisted pair) and ...
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2answers
116 views

Ground losses in mains delivery network

It is my understanding that the mains distribution system (poles along the road, where I live) has occasional earth ground connections of the Neutral wire. Maybe every pole, or just every few poles, ...
45
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10answers
21k views

Why is main's neutral tied to earth?

My dad is an Electrician and I myself am an Electronics Design Engineer, and to this day he still hasn't been able to give me a good reason for this. Consider the two following pictures/situations - ...
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2answers
111 views

Why do I see a 20 Volts peak-to-peak sinudoidal signal @ 50 Hz on my ESD mat cover?

I accidentally touched the ESD mat cover on the my table with oscilloscope probe[voltage probe, 700MHz]. It is shown a pure sinusoidal signal with an amplitude of near 20Volt peak-to-peak @50Hz on the ...
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2answers
1k views

circuit ground vs chassis ground

Can someone briefly explain what's the point of separating circuit ground from chassis ground with a capacitor + resistor?
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9answers
5k views

Grounding in space

I'm working on a project that will be launched inside a Blue Origin New Shepard rocket and need to know the details of how our experiment will be grounded. The experiment will have a 5 V USB 3.0 ...
2
votes
1answer
404 views

HDMI triggering the Ground Fault Circuit Interrupters via Projector

Overview: A colleague of mine took her HP laptop from Canada (19.5 V, 1.4 A DC rated) to work in Brazil and experienced ground fault trips on the outlets when she connected an HDMI to a projector ...
2
votes
1answer
298 views

smps and ground layer (4 layer PCB)

I am designing a 4 layer smps (low noise) and I have a some design philosophy questions . Under the transformer (that separates primary from secondary) should I extend the ground planes ( one primary ...
2
votes
3answers
256 views

Connecting one circuit to another via a transistor as a switch

I'm a software engineer, and know very little about electronics. I'm learning slowly, so appreciate your patience and kindness :) I will gladly return the favour someday. I'm trying to build a ...
1
vote
1answer
302 views

Dangers of ESD wrist wrap / mat / ground Plug Adapter in an Apartment building?

I would like to know if there are any dangers when we are using a wrist wrap connected to an ESD mat that is connected to ground on the wall socket in an apartment building. Lets imagine that in your ...
1
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2answers
1k views

Grounding inside a plastic enclosure

I hope this is an easy question for you. I am using a plastic box as a watertight enclosure for a single board computer and some accessories. I will be using an AC power source coming in through a 3 ...
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3answers
340 views

grounding a moving robot

I'm am designing an external battery pack for a robot, Pepper, a robot by Softbank (I'm am not making the battery itself but the circuit connecting two batteries). I am going to connect a 25V (LiFe-...
1
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1answer
369 views

highfrequency signal on ground

I designed a PCB where I have a local oscillator Input to an IC. The LO signal (2.48 GHz) has a power of -20 dBm. I put a cut SMA cable on the ground plane and measured a signal level of -60dBm. Is ...