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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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2 votes
2 answers
3k views

Use of multiple earthings for single installation

For a home electrical wiring, is it acceptable to have to multiple earth rods on different (reasonably apart from each other) locations? In good practice, to keep earth resistance low, we use multiple ...
0 votes
1 answer
343 views

Analog signal input from device with different ground reference

I am somewhat new to the world of electronics, but am now trying to design my first more complex PCB. I am trying to make a set of battery powered earphones that take an input from a 3.5mm audio jack ...
3 votes
2 answers
387 views

Digital-to-analog-converter PCB: Ground plane cut or not?

I'm designing a DAC board and I'm not sure what would be the best thing to do regarding grounding, to minimize noise. This is the approximate layout I have so far, with the system ground point (also ...
0 votes
2 answers
174 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 ...
0 votes
1 answer
157 views

Grounding adviseable on tube pre-amp powered by a 9VAC power brick?

I have an ART Tube MP pre-amp that is powered by a compact but rather heavy power "brick" that delivers 9V AC @ 1A. I use the pre-amp with a large-diaphragm microphone that gets its 48V ...
0 votes
0 answers
52 views

Acceptable resistance between hot (mains) and ground (earth)?

A DIY project I'm working on uses electronics embedded in concrete, including 110V AC heating elements. As I was verifying my wiring before testing the device I was surprised to discover conductivity ...
2 votes
1 answer
102 views

Telecom Lines Conducted emissions noise travel

I am seeking an explanation of how conducted emissions on telecom lines are measured. The frequencies of interest are at 150kHz to roughly 850kHz. The size of the unit is 30cm by 30cm by 15cm. The ...
5 votes
1 answer
217 views

Metal chassis grounding with wall wart supply, ESD test failed

We're building a device which takes its input power from a 12VDC wall wart PSU, and has a metal chassis. We just passed preliminary EMC/EMI test, but in the ESD test an 8kV jolt to the chassis killed ...
2 votes
2 answers
241 views

Will this design cause corrosion from a ground loop?

simulate this circuit – Schematic created using CircuitLab The design is an undersea light. The connector provides the customer ground-line-neutral. The line and neutral are connected to an ...
1 vote
1 answer
159 views

Ethernet circular hybrid connector grounding and shielding

I have developed a board based on STM32F207ZG MCU with Ethernet interface using: LAN8742A TVS diodes device for differential pair signaling Magnetic-transformer device Hybrid circular connector from ...
0 votes
0 answers
39 views

Ground connection of power converter and MCU

I've designed an AC/DC power converter PCB, with input, and output voltage sensing, but I have problem connecting it to microcontroller board, i'm using F28379D launchpad as the microcontroller. I ...
0 votes
2 answers
54 views

Connecting Two 24VDC Power Supplies

I have a system that has multiple different gas detection sensors and we are datalogging our readings onto a PLC. To power our sensors we are using a 10 A power supply and have everything grounded ...
1 vote
0 answers
136 views

Circuit works only when oscilloscope probe is connected and does not work otherwise

I have built the circuit shown below. The problem is that the circuit only works when I connect oscilloscope probes between node-A and the ground. If I remove or decouple the probe-ground from the ...
0 votes
0 answers
22 views

Audio project converting TSH-4 headset to 3.5 mm audio jack

I've been trying to connect this TSH4 headset to a 3.5 mm audio jack. The headset has kind of a weird setup, with Mono audio + and - being the top pins (I don't know which is which, but the polarity ...
4 votes
2 answers
531 views

Grounding ESD Table

I work in a manufacturing plant and we are setting up new ESD benches. Essentially, the table is grounded to the ceiling of the building and then multiple work benches are connected to that bench with ...
2 votes
0 answers
32 views

Telecom Lines Conducted emissions [closed]

We have rented a Telecom line ISN to conduct some in-house pre-compliance testing. The test setup closely follows the CISPR32 standard. We encountered issues with conducted emissions in the lab, which ...
11 votes
4 answers
7k views

Why we use ground

I have been wondering this for a while, so I did some digging, and as usual, wikipedia was the most illuminative. It looks like the telegraph was the first time ground was introduced to complete a ...
2 votes
1 answer
186 views

Where to connect shielded cable when you have no chassis?

I joined a project after some of the initial design decisions were made, so it’s not quite how I’d like it, which now presents me with a bit of a problem. I have two power cables that are emitting ...
0 votes
1 answer
174 views

Do the dipole antenna edges have earth potential or is it a closed circuit made of co-axial cable?

I understand the shape of the dipole antenna, but how is it fed so that the current only flows through one direction during the half cycle? Even in a normal pole antenna, is there a ground at the edge ...
0 votes
1 answer
178 views

Effects of Improper Grounding on Common Mode Noise

In a DC power system like the one shown below in the diagram, a resistor is placed between the return wire and chassis to limit fault currents in the scenario where there is a high side to chassis ...
-1 votes
2 answers
263 views

Why does a capacitor plate connected to Earth lose charge?

Can you please explain this to me? Is this correct? Why does the plate become neutral if the field outside the capacitor is zero?
1 vote
0 answers
64 views

EMI/EMC: Connecting PCB mounting holes to chassis in multi-board system

I am working on a system which has a metal chassis connected to the earth. The system gets power from a dedicated PSU. The power lines of the PSU (VCC_PSU / GND_PSU) are fed into a master PCB and ...
3 votes
2 answers
104 views

My isolation transformer has its protective earth connected to the output neutral. How should I rewire it for my home lab for "DUT probing"?

I have a rather sturdy isolation transformer in my home lab and I just realized that the primary side earth is not only connected to the output side earth but also to the output side neutral. I don't ...
1 vote
4 answers
72 views

Can differential probes be used with floating oscilloscopes, such as handheld/tablet scopes?

I am in the market for a differential probe (and possibly a handheld oscilloscope down the track for field work). One seller I came across has a warning for many of the probes that they sell saying &...
0 votes
2 answers
65 views

Dedicated ground vs power cord ground?

So my Siglent 1104X-E oscilloscope has no dedicated ground- it uses the power cord's ground. My Siglent function generator has a dedicated ground (screw terminal with banana plug option). Obviously I ...
5 votes
5 answers
2k views

Why does power supply have a negative rail if can only output positive voltage?

According to the datasheet of this power supply, the output voltage goes from 0~60 VDC. If the output can't be negative, why does it have a negative rail beside ground? Why not just have ground? In a ...
0 votes
1 answer
182 views

Grounding microcontrollers, signal and logic level wires in a vehicle with buck converters

I sketched out my main installation in my project vehicle. To summarize, it runs with isolated DC converters, one gets the input from main battery (standard 12V lead acid) and converts it to clean ...
0 votes
1 answer
72 views

CAN BUS Chassis Grounding

Hoping to get get some guidance on correct grounding for a CAN Bus I have designed. The following diagram gives a high level overview of the system connectivity: Some notes on the setup: There are a ...
1 vote
1 answer
51 views

Earth protection in PV + battery system

I'm building a system that looks like this: PV -> solar charger (48 V) -> batteries (48 V) -> isolated DC/DC (48 V->12 V) -> non isolated DC/DC (12 V->3 V) -> load The PV's are on ...
1 vote
1 answer
40 views

Problem: Transient Voltages in Grounding Circuit Cause comms loss

I am working with a Hipot unit to break down a DUT. The Hipot is powered by an independent 220V Ckt. In my test setup I have a PC and another unit, both of these are powered from separate 120V ...
0 votes
0 answers
79 views

Why did my microcontroller emit smoke?

My setup is as follows: I have an RGB LED driver board powered by a 24V SMPS. The microcontroller, an ESP32, is connected to the driver board by RGBW PWM lines and a ground line. The ESP32 is also ...
4 votes
2 answers
497 views

PCB layout for crystal of MSP430FR6047

I want to design a layout for MSP430FR6047 and I was reviewing a reference design form TI for MSP430FR6047 Evaluation board, then I noticed the are 4 different GNDs as follows: (USSXTAL_GND, ...
1 vote
1 answer
74 views

Grounding Lug Straight To Chassis

Connecting some thicker gauge cable to my trailer to ground neutral for the 12v DC system. The current 8AWG wire uses a receptacle style lug where the wires are inserted and the that receptacle is ...
0 votes
2 answers
180 views

Pre-amp connection problem

I am trying to complete the circuit shown above. I am having trouble as the ground connection is not clear to me. Please help me to complete that circuit. And also tell me how to connect C5 ground ...
0 votes
1 answer
65 views

How to Ground a Photodiode and TIA combination

I have a TIA circuit as below, In simple terms the Photo diode is a APD C30955EH and Circuit is supposed to work up to 100Khz signals digitalization. The supply which is powering the circuit is a ...
1 vote
1 answer
294 views

What grounding should I use for this capacitively coupled input?

I'm designing a device that will receive and digitize analog video signals. In analog video, it's recommended to capacitively couple inputs. A typical input might look like this: In this case the ...
0 votes
0 answers
23 views

Substation supplies with touching MSBs

On this site we have the below setup: We have 3 x main switchboards fed via 3 x separate transformers that are existing, this existing MSB has a connecting earth bar only and no neutral connecting bar ...
0 votes
0 answers
48 views

Questions regarding TVS-diodes and grounding

I am currently working with solutions to pass the ESD-requirements for EMC. I have used TVS (ESD)-diodes in the past to good result, but never really understood exactly why they work. Sadly, this is ...
0 votes
1 answer
38 views

Can a ground connection for a 230VAC device go to a 0V of a 24VDC circuit?

So, here is the situation: We are designing a small oven made out of aluminum. For it we plan to use a power adapter from 230VAC to 24VDC. The problem is that the temperature controller we have ...
0 votes
2 answers
108 views

Are common mode chokes really needed for Conducted Emission standards when there are only two terminals?

Common mode chokes make sense for power inputs when there are three terminals: power line, power return line and an "earth ground". You measure the noise of power line with reference to ...
0 votes
1 answer
213 views

Correct configuration for adding an earth terminal block?

I have a small motor controller test board setup like the diagram below: A few loads such as a motor controller, and some switches are connected to the live and neutral terminal blocks for power. ...
0 votes
0 answers
55 views

TN-S Earthing System

I wanted to give a good explanation about the installation that i have to examine. I want to explain that it has a TN-S earthing system. I have conducted several measurements, and they yielded a loop ...
4 votes
5 answers
2k views

Why doesn't current short through ground in a grounded secondary winding of a transformer?

I am reading a book on electrical practices and I've come across to a statement that says it is safe practice to ground the secondary winding of a transformer. In general, why does grounding one ...
1 vote
0 answers
50 views

Broken ground conductor in single wire earth return (SWER) system

I have a property in a rural area that is serviced by a SWER line. This means we get one high voltage line from the utility into the service transformer, whose other leg is connected directly to ...
0 votes
1 answer
241 views

Ground reference with DW01 and MAX17048

I have designed a project that includes a TP4056 with DW01 protection ic and porwer sharing feature. Now I want to include a fuel gauge and the only one I have found is MAX17048 I have readed the ...
-1 votes
1 answer
64 views

Could an insulator-covered copper plate be used as ground instead of grounding rod(s) buried in the ground?

Sometimes there are situations where I need to ground a device plugged into 220V/50hz AC but the plug is ungrounded. An example is using a generator that has a grounding rod but no place to stub it ...
0 votes
0 answers
28 views

Problem with circuit--ESP showing invalid packet header on powering the robot on by battery

I am trying to build a self-balancing robot, the circuit of which I have attached here. Now I am facing an issue, which is when I power the ESP via the 5V buck convertor output, the ESP gets corrupted ...
0 votes
0 answers
60 views

Can I connect 0V between 2x 24V Power supply in different devices?

Devices: Robot (24VDC 10A power source, used for an IPC, sensors, electronic boards, CAN communication, DI/DO etc) Mini automation (24VDC 10A power source but different brand, used for a mini Siemens ...
2 votes
1 answer
67 views

Cable shield connection to metal enclosure on rolling stock

It's standard practice to ground cable shields at both ends to prevent EMC issues. I am uncertain if this practice applies to enclosures installed on train roofs. In my setup, I have an I/O cable ...
1 vote
1 answer
425 views

How does this soldering iron sleep sensor circuit work?

I recently built a unisolder soldering station and am struggling to understand how the detection of the soldering iron within its holder is implemented. The unisolder board itself provides a 3-pin ...

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