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

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1answer
37 views

How does the power station compensates for the current that flows down to earth due to domestic body-current faults?

I know current flows in a loop and energy is used to move it in a loop. Now suppose we get a single phase AC (220/120V) electricity supply for our home and we have earth connection to prevent shocks ...
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1answer
39 views

Simulate Automotive Speedometer Sender

I am working on a project and I have run into a little bit of a problem. I have a speedometer gauge that I am trying to send a signal to on a bench (out of car). The way in wich the it works is ...
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0answers
47 views

Connecting to an electrically isolated system with a manufacturing test jig

I am in the middle of developing a manufacturing test jig for a product that is powered using PoE (power over ethernet). Part of the specification for PoE is that devices that use it be electrically ...
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votes
0answers
62 views

I need help troubleshooting this battery charger/ voltage converter PCB [closed]

https://easyeda.com/editor#id=|8d81327d6dc844d18b79c904581fdee8|5d46fcd8dacf4a44b908ff023d83213a|d86dbc9f9e114e7c8ef41c07b81c5d83 This PCB is not working can anyone help. It is a battery charge, ...
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vote
1answer
55 views

Gounding for EMI and signal integrity - LED Matrix multiboard design

I would like to implement a LED Matrix circuit like this one, where the LED matrix enclosed within the blue dots will be on a seperate PCB than the rest of the circuit. Since this will be a ...
6
votes
3answers
399 views

RS 485 ground signal and chassis

I have a shielded twisted pair running from one device polling several devices in an RS 485 loop. The conditions: The devices are in parallel as they should be. The termination resistors are in ...
3
votes
2answers
417 views

long current return path in star topology of grounding?

I'm designing a system with a MCU board and multiple peripheral boards. I chose a star topology for grounding, in other words, the GND pins in each board is connected to the power source. However, ...
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1answer
39 views

GND pour for an AVR

AVR has two or multiple GND pins, and the GND pins are useful to provide ground references to other components. I have questions about the GND pour for such MCU with multiple GND pins. Is it ideal ...
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votes
1answer
38 views

ground loop on an adaptor board

I want to make a PCB on which PowerBOost 1000 Basic will be installed. The PowerBoost is a breakout board for a voltage regulator and has four GND pins. In this case is it better to connector the four ...
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2answers
48 views

does the 24 Vdc supplied circuits with metal chassis needs to be grounded to earth?

I used put some electronic circuits together in a plastic box, with a DC power jack attached to the box for a 24V dc supply to my circuit. Everything works fine. However i now plan to put all the ...
0
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1answer
39 views

Grounding house battery to vehicle chassis

For a solar power installation in a van/RV, should the negative terminal of the house battery —the battery that is charged by the solar panel and used to power devices and appliances whether or not ...
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vote
3answers
108 views

Electrically Grounding a Large Heatsink to PCB Layer Ground

I have a 100x100mm board that is directly attached to a same sized heatsink on one side (touching heat producing IC packages). The board is 4 layer, with a large ground middle layer. Is there any ...
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2answers
109 views

Are “bootleg grounds” really more dangerous than other single-point wiring failures?

Continuing my attempt to understand the use of grounds in modern electrical service: There are numerous posts illustrating why a "bootleg ground" (ground connected to neutral outside of an AC service ...
1
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2answers
89 views

Separate grounding for analog and digital portions of circuitry

A datasheet suggests separate grounding for analog and digital portions of circuitry (http://www.ti.com/lit/ds/symlink/am26c32.pdf#page=12). Is this to say that the IC's outputs should have a ...
1
vote
1answer
59 views

Eleminating radiation from chargers

When I move my EMF radiation meter near a charger it shows me that there is radiation from the charger, and even the device itself radiates when the charger is connected to it. The chargers emit ...
0
votes
1answer
69 views

What determines whether a household device needs a grounded plug?

Why do some UL-listed household electronic devices have grounded plugs, even if they have no exposed metal on their case? E.g., I have a plastic-encased laptop AC/DC power supply that requires a ...
1
vote
3answers
57 views

How to use a relay to “lift” 12v ground of a two 12v battery system

First off, sorry about the long title as I don't know a better brief of my situation. Project: I am converting a bus into a trailer to be pulled by a semi truck 5th wheel style. The bus has it's ...
3
votes
1answer
159 views

Why is neutral wire connected to ground at the transformer?

I understand the use of ground wire at the home appliances but why is the neutral wire connected to ground at the transformer? Why doesn't the neutral wire go back to the power generation plants. I ...
1
vote
1answer
66 views

Do I need to care about mounting hole contact oxidation?

I am designing a pcb which I have some mounting hole with the function to connect the mounted screw to the PCB ground. I found good resources about this subject in the blog, like this one and this ...
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votes
1answer
112 views

Oscilloscope had weird interaction with Laptop

Can someone explain to me why the below situation happened? Thanks. I tried 'debugging' a circuit. The circuit was a H bridge, and I wa using it to sent current through human body to induce feelings. ...
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0answers
38 views

Grounding Transformer

I am designing a device with a transformer in its power supply (Hammond 270X). To follow safe design procedures, I am connecting the chassis of the device to earth ground. Is it significant whether or ...
0
votes
2answers
46 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
votes
1answer
52 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 ...
1
vote
1answer
91 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
127 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
votes
5answers
160 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
votes
3answers
145 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 ...
-1
votes
1answer
56 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
41 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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votes
2answers
44 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 ...
0
votes
1answer
59 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 ...
0
votes
1answer
45 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
90 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
230 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 ...
0
votes
1answer
67 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 ...
1
vote
2answers
120 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 ...
0
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2answers
152 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 ...
0
votes
1answer
69 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 ...
0
votes
1answer
50 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 ...
1
vote
1answer
61 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 ...
0
votes
1answer
67 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
vote
2answers
65 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 ...
1
vote
2answers
167 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
vote
1answer
60 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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votes
3answers
113 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
19 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 ...
0
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2answers
172 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 ...
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0answers
12 views

When can asymmetrical grounding cause problems?

I've used a 3 phase Variable Frequency Drive that where the manuals states the internal EMC filter must be disconnected when it's used with power sources with asymmetrical grounding (e.g. High-leg ...
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votes
1answer
113 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
130 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 ...