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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centre-tapped inverter vs floating neutral inverter

I bought a 12V-230V inverter from local electronic shop, and powering it with my secondary battery in my car. Secondary battery and starter battery shares a common ground, which is car chassis. The ...
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Beginner Electronics Hobbyist Q re: oscilloscopes and grounding

I'm in my infancy as regards electronics, but will soon be acquiring an O-scope as part of my learning plan. I'm at the stage (and will be for some time) where I'm building simple things on a ...
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Disconnected wire still lit Tester turns on

I have multiple wires going through an electrical PVC conduit. Two phase wire carrying 220v AC of 1.5mm gauge. Two neutral wire carrying of 1.5 mm gauge. One wire for earthing (grounding) of 1 mm ...
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How can I step down 24V to 5.5V and 3.3V with separate grounds?

I have a 24VDC 4A input that I need to step down to both 5VDC and 3.3VDC, but I need the 24V ground plane to be separate (isolated) from the 5V and 3.3V plane (these can have a shared ground). What ...
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Why this grounding scheme?

The NASA technical book about grounding in spacecraft (NASA-HDBK-4001) (I believe the question may be relevant for any other terrestrial application) mentions this grounding scheme for subsystems: ...
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Why is single-point series grounding avoided in resolving ground-loop problems?

It appears that using single point series grounding, there is some additive effect $$ V_{c}-\mathrm{what's\;accounted\;from\;Circuit\;1\;and\;2} $$ My question is if this approach is closest to what ...
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Should I add ground stitching vias?

I'm designing a 2 layer PCB, that contains an ESP32, a LoRa module, a GSM module, and some connectors to command relays. The top & bottom layers are both ground planes, and I have 5V & 3.3V ...
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141 views

Portable AC power source earthing?

I have an 12V to 230V inverter in my car but get confused about ground it. The inverter is centre-tapped, means live-earth voltage is +115V, neutral-earth voltage is -115V, this gives an L-N voltage ...
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Replacing sub panel, grounding electrode conductor [migrated]

I am replacing the 200 amp sub panel in the basement, and trying to understand if it is required to run the grounding electrode wire to that sub panel or not. Currently, there is no grounding ...
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Is Petersen coil in resonant network tuned also for capacitor banks?

Petersen coil is tuned every 2-3 minutes to compensate for a certain percentage of capacitive current in resonant grids during earth faults. But, if capacitor banks with ground connection are switched ...
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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 ...
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Are these contacts grounded?

This is the schematic for the Magnavox Odyssey. Looking at some of the "GAME CARD 1" connectors, can it be assumed that 9, 38, 28, 42, etc, are simply not connected? In other places, "...
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how does AC coupling eliminate the ground current problem between data source and destination in FPD_Link II I/F?

Reading about FPD-Link II in Wikipedia, I came across this statement for which I need clarification: Because the signal is DC balanced the application can use AC coupling, which eliminates the ...
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Replacing keyboard USB-A cable with a USB-C female connector

I have a keyboard with a long non-detachable USB-A cable that I would like to replace with a USB-C female connector. My end goal is being able to detach the keyboard like a portable device and use it ...
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2 answers
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What is the purpose of the 1 Mega-ohm 1/2 watt resistor between neutral and ground, in a vintage audio amplifier (SONY model STR-7800SD)

I own an old SONY radio / amplifier, model STR-7800SD. I opened it and I saw a resistor between one of the AC lines and the chassis. The funny thing is that it has a REVERSIBLE 2-prong plug! So, I ...
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Why does Japan use 100V AC as opposed to 120 or 230V, and why are many of their plugs ungrounded?

I don't live in Japan but I have noticed this interesting phenomenon when it comes to their electronics. I'm buying a PC-9800 and because it remained isolated in Japan its power supply is only rated ...
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Chassis / Shielding Grounding on Mobile Robot

I am working on a project building a mobile robot. I realized that the robot will have a buildup static when it is running because I can feel it when I touch it (uncomfortable spark). The robot is ...
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Single vs two pole breakers - Single phase loads on IT power with distributed neutral

Are two-pole breakers required on single-phase 230 V loads when connected to a 3-phase supply with IT earthing system (with distributed neutral) in Germany? Where in the standards is this requirement ...
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Why is switching off GND instead of VCC a bad idea in battery powered application

I'm currently tasked with designing a battery-powered device (i.e. it will be connected to two four-cell LiPo batteries, each with a voltage of 14.4V to 16.8V) and am having quite a hard time finding ...
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What is the explanation for a haptic effect when tracing one's finger along a powered device's chassis? [duplicate]

I have a mid-2012 Macbook Pro Retina, and over the years I notice that when I wipe my finger along the surface of the chassis (like when wiping off dust), I sometimes feel a vibrating effect, a more ...
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Diesel generator ground and protection devices

I have a question about protection in a portable power system. I am working on a project that is a moving truck with a generator on it. We should use the generator to feed some customers when the ...
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Connection between Analog GND and digital GND

While studying the following schematic I see that AGND and GND are connected with a 0R Does it make any sense? Why not just use a common GND? The 12V power supply input has a 100R resistor with an ...
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Can I use an exposed water pipe as a reference only?

The outlets in my working space are unearthed, but there is an exposed copper bit of heating pipe that appears earthed (there is 230 V between it and the outlet). Now, after some research here I've ...
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Is it safe to connect USB 2.0 ground with SATA ground?

I'm building fan controller for my PC water cooling loop, it will consist of: 1x Raspberry Pi Pico, 6x 3-pins fan headers, 0.5A max each, 1x water pump header, 2.5A max, 1x thermistor header for ...
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Is earthing pointless without a residual-current device?

I don't quite understand what the situation is with the safety ground. In theory, it evens out the voltage to zero but only if the resistance is exactly zero. Even if the ground has only a resistance ...
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Can I use 2 different power supplies to power the electret mic and op amp separately?

the power supply is a placeholder and it will be rated 12v to power the ne5532 op amp since 5v cannot power the op amp. The 5v dc will come from the same usb as the sound card which the electret mic ...
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Can a ground loop occur if everything is sharing a single socket?

In a system where all devices that are connected ultimately share the same wall-socket, is it possible for a ground loop to occur. For example: A strip cable plugged into a socket powers a computer ...
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16 votes
5 answers
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Where is an airplane's electrical ground point?

I recently had a conversation on Reddit where someone claimed that the ground reference on airplanes was their fuel tanks. This seemed a bit off to me but I know nothing of aircraft in general. I ...
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1 answer
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Connecting ground between microcontroller, multiple sensors and motors

I am currently working on a automation project consisting of 3 analog sensors and 2 dosing pumps using a Raspberry Pi 3 B+. I am powering the sensor and motor modules using one 12v 5A power supply to ...
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2 answers
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Correct usage of a transistor?

I am trying to use an ESP32 to remotely trigger my camera via WiFi, via the remote trigger outlet on the camera (which uses a 2.5mm audio jack.) To trigger the focus, I need to connect the tip (3.3V) ...
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'Tingling' feeling when using ungrounded Macbook Pro - Safe thresholds [duplicate]

I've noticed an oft reported 'tingling' sensation when using my Macbook Pro and was curious to measure how much electricity was running through my body while using the laptop plugged in like so: ...
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2 answers
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Purpose of potentiometer ground wire

I purchased a rod potentiometer and was surprised to see it came with a 4th wire. The manufacturer said it was a ground, though the wiring diagram didn’t even mention it. What’s the purpose of a ...
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1 answer
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Is the SWER (single-wire earth-return) system dangerous? If not, why not?

When a live/hot wire touches the Earth ground, it creates step voltage and so it's dangerous to walk on ground during this fault. But in a single-wire earth-return system, we use earth/soil as ...
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Grounding for working with electrostatic-sensitive devices

I'm planning one of my first electronics projects beyond basic repair soldering (it's a small pre-amplifier for a contact microphone). So I've got some JFETs and other pieces and would like to put ...
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3 answers
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Can you touch a live wire without being shocked?

I understand many questions about electric shock from live wires and I apologise for adding to that list but after reading many of them I still have my concerns. From what I have read from some of ...
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1 answer
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Looking for an explanation of grounding in relation to computers and DVI-HDMI adapters

I recently found that a DVI-HDMI adapter, purchased to connect the micro-HDMI port on my new Raspberry Pi 400 to the DVI port on my monitor, behaves strangely: it works well when connecting to my ATX ...
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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?
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Grounding of metal enclosure

I have a metal meshed panel closet and I placed most of my electrical appliances inside. Most of them use standard 220 V and have a ground (type F cable), however, some do not. I want to ground the ...
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1 answer
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Arduino grounding and protection in 12v system

I'm tinkering on my garage project, standard vehicle stuff - 12 V lead acid battery, 3-phase stator, reg/rec. I would like to put few additions to its circuit. Being a rookie, I'm not sure how to ...
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Discrete amplifier not passing audio

I have a card that can receive two dual input opamp with feedback. The card is currently connected to V+ and V- only for taking measurements. The +24V rail is doing great. I also know for sure that ...
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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 ...
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Grounding sensitive devices (ICs, logic level switches) in a vehicle (generator and battery) environment

In my project vehicle I will be using a buck converter that can take from 9 to 18V and output clean 12V. I will also need smaller regulators (12v to 5v) for couple of microcontrollers. I've heard ...
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Mesh ground advantage over single rod ground

In high voltage laboratories, how do mesh grounds perform better than that of single rods? Does frequency play a role here ? Which one is more beneficial, using multiple single rods in lab for ...
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4 answers
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Where is the ground in this circuit?

I am designing a simple digital circuit on a PCB that includes a power supply that provides +24V and -24V, but there is no ground. I am assuming that the negative voltage (-24V) is ground? What about ...
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Effect of (possibly missing) grounds in power amp output circuit

NOTE: It turns out, the ground connections I wonder about below actually are connected (thanks Sim Son in comments), although I still cannot see how they could be connected (additional closeups). The ...
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Common mode choke and grounding

How would you connect the cable shielding, metal enclosures and power ground on following system: Since I had problems with noise before I wanted to add filtering on power input for "my PCB"...
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Should the metal frame on a Nokia 3310/5110 style LCD display be grounded? [closed]

I'm currently tinkering with a design which includes a Nokia 3310/5110 style LCD, and I've noticed that the prototyping boards don't seem to connect the metal frame to ground: There are pads, but ...
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How to attach the various ground pins of a TDA7560 amplifier?

I'm now about to integrate the TDA7560 amplifier into my audio circuitry, but I'm still not sure about what the various ground pins of the amp to. There are a bunch of them: 1× TAB (pin #1) 4× P-GNDs ...
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Grounding buck converter in a vehicle

For my test project I need to use this isolated DC converter in a vehicle, activated by relay and routed to a 6 circuit fuse block. Can I route just the positive from relay to converter input and ...
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Does current flow from earth connected conductor in uniform electric field?

If we place a conductor inside of uniform external electric field then opposite charges will get induced on the both sides of conductor. What if we connect two earth wire to each side, will continuous ...
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