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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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PCB Power and Ground planes Setup [duplicate]

When designing a 2-layer PCB, I've read that ground planes are good to reduce noise and to provide a stable-ish ground reference when a board isn't connected to a chassis, ground etc. If I need to ...
Steam Ranger's user avatar
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1 answer
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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 ...
gid204's user avatar
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Why are these RGB grounds connected to the signals?

This is part of the schematics from an old arcade cabinet. The RGB signals all have distinctive grounds that seem connected directly to the signals cable. How is it possible? There is a video ground ...
Chris Nuvoli's user avatar
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Current sense GND planes Power & Signal

I couldn't find a clear answer anywhere. I have a battery powered device which therefore has a VBAT+ and a VBAT-. The battery is used through some power stages (which contain MOSFETs which are driven ...
Clem's user avatar
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2 answers
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How is the ground node location decided?

I'm very new to electrical engineering, and would like help in understanding how a node is decided to be declared as a ground node. Does the location of the ground node matter, and cause circuits to ...
RetroBoltDev's user avatar
2 votes
3 answers
921 views

Why does a line-tester glow more when I touch the steel door frame?

I reassembled my line tester, and it was then that I got to know how it actually works. I know that when someone touches the metal part at the top, the neon LED inside glows. However, I have seen that ...
Awais Saeed's user avatar
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2 answers
93 views

SPI cable with twisted pairs with ground: Are ground loops an issue?

I am connecting my microprocessor to a SPI device through a cable, with the SCK, MOSI, SS and MISO lines, in addition to +3.3V. I was told it is advisable to twist each line cited above, including the ...
Tommy95's user avatar
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STUSB4500: Contact Ground Issue

I'm working with the STUSB4500 for USB PD Sink. My PD circuit is the same as the Sparkfun Power Delivery USB-C board, and everything works well, except for the fact that the ground is super sensitive ...
Emerson's user avatar
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2 votes
1 answer
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Multiple DC-DC power supplies and common ground

I am busy designing the power supply end for a system (mostly networking equipment, raspberry pi's etc) that run off a 12v source (effectively an online UPS I built). Some of the equipment run on 5v, ...
RL3's user avatar
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running digital io across multiple power grounds

My circuit has a few ground references and I'm unsure how best to connect them. I have a solar battery charging module: GV-5-MOD (datasheet) and it has a several relevant terminals: PANEL- BATTERY+/...
davegravy's user avatar
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Better to terminate guard ring to cable shield or leave shield unconnected at load?

I am working on designing a precision rectifier and charge amplifier for a small-signal piezo transducer. This tiny board will be a sensor "load" sending a mV-to-1V amplified analog signal ...
Matt001's user avatar
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How do I solve DC offset GND between 2 power supplies 220V to 12V/GND? [closed]

The setup: Two modular synths (lets call them A and B) with each their own power supply making 220V AC into DC +12V, GND, -12V. I measure a DC offset (like 6.5V) between the GND's of synths A+B (no ...
user3810130's user avatar
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2 answers
80 views

How to calculate the impedance accurately?

I connected a circuit as shown in the following figure. The device under test (DUT) is powered by a battery. The negtive pole of the battery is connected with the conducting housing of the DUT, while ...
Reboost's user avatar
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-1 votes
1 answer
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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 ...
Dimitrios Desyllas's user avatar
3 votes
2 answers
215 views

Dirty VS clean ground: How to tie grounds?

I am trying to understand when grounds can be connected together and when they should not be. So far, I have learned the following: Clean grounds should be connected together, as should dirty grounds....
chami's user avatar
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How do I mark pads on the PCB footprint as not used in KiCad?

I'm using KiCad to design a PCB. I'm using Raspberry Pi Pico, which has a number of GND pins (for designer's convenience). The symbol/footprint I have (downloaded somewhere from the Internet) have ...
Spook's user avatar
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1 answer
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How does a socket grounding tester work?

I'm curious about how socket grounding testers like these work: https://www.amazon.com/Amprobe-ST-102B-Socket-Tester-GFCI/dp/B008E07HM2/. I'm also curious about what kind of false positives they could ...
Jasper Siepkes's user avatar
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Arduino Nano freezes at random times when motor is connected

I am to run a motor and control it with an Arduino Nano. I want to send signals to the nano with the usage of an nrf24l01. The correct use is that by default the motor will spin at a certain speed and ...
Valantis P's user avatar
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53 views

Voltage divider network 12V / 24V option to UVLO pin of LED driver

I have a voltage divider network with R1 and R2 and another R2 in parellel but not connected to ground. I have a dip switch where turning it on changes to 24V so it adds the second R2 to ground. Can ...
Andy's user avatar
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3 votes
2 answers
232 views

Where to connect transformer ground?

I am rewinding a transformer that got fried. It is a single phase, reducing transformer. On the primary we have mains, and the secondary is tapped at different points. See figure for details. ...
DrD's user avatar
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5 votes
1 answer
356 views

Bidirectional TVS between field ground and analog ground

I'd like to know why this circuit has a TVS diode between both grounds. The field ground is the physical ground used in the circuit and the analog ground is used for 6 analog signals (between 4 and ...
Jjeico's user avatar
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3 answers
139 views

Ground detection circuit

I'm designing a circuit containing a button with a pull-up/pull-down logic depending on whether I'm grounding a header. The button triggers a GPIO that will detect if the header is grounded thanks to ...
Bibibou's user avatar
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1 answer
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Ground plane for PCB Antenna

I'm working on a PCB and want to incorporate a 2.4GHz PCB antenna but am a bit confused on how to handle the ground plane(s). This is a 4-layer PCB with Signals (and ground pour) on the top layer, ...
Nollstead's user avatar
2 votes
1 answer
55 views

Managing Ground Return for High Surge Currents in LED Capacitor Discharge Circuit

I have a use-case in which I require four bulk capacitors (470uF) charged to 6.4V. Each separate bulk capacitor will be used to provide the necessary energy to pulse a string of three LEDs at 5μs ...
NickRand's user avatar
0 votes
1 answer
81 views

24 VDC system and metal ground

I've built a rubber tracked mobile robot and it has a metal chassis. I use a 24 VDC 30 Ah battery to power a system which includes two DC motors, motor controllers, an industrial PC and some sensors. ...
Marcus Barnet's user avatar
0 votes
1 answer
57 views

To which ground should TVS or ESD diodes connect?

I am designing a circuit with both signal ground and earth. As far as I know, a TVS should be connected to the earth. What if there is a huge voltage different between the ground and the earth? Let ...
andykkkk's user avatar
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1 answer
66 views

Errors in Schematic made in Altium Designer

I am using Altium Designer as ECAD tool for first time to create the schematics. There are few errors which are popping up and I don't know how to get rid of those errors. First one is regarding HI ...
Alison's user avatar
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0 votes
1 answer
44 views

XMOS XCORE 60-pin QFN footprint ground pad

I'm designing a PCB that uses an XMOS XCORE microcontroller (XU316-1024-QF60B-C24) and the only GND connection it presents is the middle ground pad. I couldn't find any example of how this is supposed ...
Emerson's user avatar
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0 votes
2 answers
69 views

How to link GND vias to the GND plane

I know that it's possible for the GND vias to connect to the GND signal layer in a 4 layer stack. How do I achieve this?
9_daytona's user avatar
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Signal Ground near Earth POE

I have Earth Ground 48V poured around the components before our diode array. I have three seperate ground planes, one for Earth, one for our POE components before the transformer, and our signal 5V ...
Wes Ellgass's user avatar
3 votes
2 answers
89 views

Ground Plane Method

I am designing a PCB to handle some modifications as a stepping stone from a well designed pcb from professionals to what my modifications need to be. I have poured ground on top and bottom and joined ...
Wes Ellgass's user avatar
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0 answers
47 views

Best way to indicate a good ground connection?

I'm working with 120VAC, and I'd like to have an LED indicator light showing that there is a connection to ground (earth). Like the way a receptacle tester does. I could connect the LED between hot ...
Mike Gray's user avatar
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0 answers
76 views

Why do I measure a voltage between me and the hot wire?

If I plug one lead of a multimeter to the outlet phase wire and the other lead to my hand, why does it show 100 V when I stand in carpet, and 150 V when I stand at pure floor? What causes that voltage?...
electrixx's user avatar
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75 views

Will this driver circuitry work as intended to switch half-bridge FETs?

Given that the PWM_H signal is referenced to SGND and the driver is referenced to VSW (switch node of the half bridge), will the gate driver function correctly without a connection between the driver'...
Rohan Kharvi's user avatar
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1 answer
111 views

Trying to get 5 V using MT3608 (step-up boost) but without success

I designed a circuit to generate 5 V using a 3.7 V battery and an MT3608. The main problem is that I can't get 5 V but just 3.5-3.9 V, even after changing resistors. I tried everything: Changing R1 ...
Simon D.'s user avatar
0 votes
1 answer
108 views

What is the exact reason for grounding (earthing) of a transformer? [duplicate]

I have some misunderstandings with the grounding of a transformer. As far as I know, the utility transformer's (the last transformer before my mains plug) neutral point (star-connected point of 3 ...
electroeso's user avatar
10 votes
7 answers
2k views

If RF signals require matched impedance to remove reflections, why do approaches to shunt noise need only a “good path to ground?”

From my understanding, for signals to propagate without reflection the impedance of the path must be constant and can be shown via the telegraph equation. When it comes to noise on the line, for ...
George kirby's user avatar
1 vote
0 answers
89 views

How to determine your ground is connected to earth

I have a tester at a remote (international) site that has been having test failures. We traced the problem to a noise issue. We were investigating the noise issues with the test/tester and ...
markshancock's user avatar
1 vote
2 answers
169 views

Why do the metal sticks (for the ground) on the ground plane antenna reflect and not absorb?

From my current knowledge, any metal whether grounded (and or earthed) or not will reflect radio waves as seen on dishes, Faraday cages, etc. On the other side the ground in transmission lines or the ...
George kirby's user avatar
1 vote
2 answers
101 views

Via process when implementing GCPW in RO4003 + FR-4 multilayer structure

I am currently developing an RF board that receives up to 8GHz. The board consists of a multi-layer structure combining Ro4003C (8mil) and FR-4. The connector I will be using for the RF board is a ...
hyerim's user avatar
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1 vote
4 answers
341 views

What is the exact function of this device connected between ground and neutral?

This is the photo of the power distribution panel inside industrial building. On the left most, next to the two thick wires colored yellow/green so as it is likely to be the "ground" we see ...
h22's user avatar
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0 votes
3 answers
220 views

Ground fault detection on an ROV

I'm helping my friend's kid with a school project where their team has to produce a small ROV. Most of their design I was able to review and help make corrections with them but I'm stumped at one ...
Jedi Engineer's user avatar
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3 answers
354 views

Safety of grounded and isolated AC in medical systems

Introduction I try to make more sense of safety and reliability of grounded and isolated electricity. I divided the problem into 3 stages: Power-transmission line Household electricity Electrical ...
M lab's user avatar
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1 vote
2 answers
82 views

Potential difference with ground

I think the potential difference (top) between the voltage sources is either 6V (15-9) or 15V (the bigger one wins?). The potential difference between the resistor and V1 is -15V. Is this correct?
Tim Graf's user avatar
0 votes
3 answers
236 views

How best to match and ground antenna?

An example of RF AM modulation: https://www.ee-diary.com/2021/12/am-modulator-using-bjt-transistor.html It is clear that the output is on point C4 and the circuit has a RF function, so I need an ...
user avatar
0 votes
1 answer
111 views

PCB ground plane oscillation [closed]

I always wondered if PCB ground plane can do harm when talking about amplifiers. When I say harm I mean oscillations, humming, or buzzing. Because I always thought, that PCB ground plane is like a ...
Anton's user avatar
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0 votes
1 answer
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On Circuits with Multiple Grounds

Just wish to make sure of something: in the circuit below, it makes no sense to speak of "the voltage at \$B\$ with respect to ground" without specifying which ground we are speaking of, ...
Sam's user avatar
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0 votes
1 answer
47 views

Precautions when using multiple analog devices on same circuit

I have a KP236N6165XTMA1 5V analog pressure sensor and a SHT31-ARP-B 3.3V analog temperature and humidity sensor on the same circuit, connected to the same ground plane (see v0.2 schematic bellow). ...
Tommy95's user avatar
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1 vote
1 answer
288 views

RS232 : dedicated signal ground or common with power ground?

I'm designing the PCB for a robot, where I plan to add some connectors for external RS232 tools (provided by the client). Each connector will provide power (either 24 or 48V, at 5A max) and an RS232 ...
Sandro's user avatar
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0 votes
4 answers
99 views

Connecting every other DIN terminal to each other

I am building a custom panel. My output DIN terminals are supposed to be in this order: Power, Ground, Power, Ground, Power, Ground.... I cannot find a proper way (jumpers or bars) to connect them. ...
aeroengineer's user avatar

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