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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20 views

How is Chassis ground connection implemented for an input cable with TVS diode protection?

I believe my question is different enough in specifics to Is it better to connect ESD (TVS) Diodes to chassis ground or signal ground? to warrant a new question. According to Electromagnetic ...
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5answers
117 views

Will I get electrocuted by touching an exposed wire of a closed circuit?

Let's say I have some electrical appliance plugged into the wall outlet and turned on. If one of the wires coming from the plug is stripped bare and I touch it, what would happen? I ask this because I ...
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76 views

Newly installed earth gives 7 volts between neutral to ground [closed]

I recently Installed new earth system with 1" Copper conductor rod with 70 feet down with Salt and charcole mixture. But i still get 7 volt 10 ohms.
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2answers
33 views

Probing an externally powered circuit using MSP432 connected to the PC

I have an circuit powered by an external SMPS and I'd like to debug it using a TI MSP432 MCU. The MCU is connected to the PC and I'll use TExaS Display software (it basically works as a cheap low-...
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1answer
41 views

Solder station grounding setup

I have a Sugon T26 soldering station. It has an European 2 pin plug, I have a 3 pin adapter for it. As far as I am aware there will be no ground connection using this method. It comes with a ground ...
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1answer
22 views

Using LCD and other modules with external regulated source and common ground

I am designing a circuit where I want to interface various modules with Arduino Mega. The way I want to do it is use an external regulated power source for the individual modules, instead of powering ...
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1answer
34 views

Ungrounded laptop power brick

I'm travelling at the moment and the three-prong plug on my laptop power brick is going through a two-prong adapter and therefore losing the connection to ground. The laptop stopped charging and I ...
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0answers
58 views

Is a hole on earth pin normal?

So there is this weird hole on top of the earth pin of an appliance: I dont know whether this is normal or not, or whether it's safe to use or not. Should I repair it, or use it hoping that nothing ...
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44 views

How to wire MCU control signals with power and ground to control multiple external motors?

I'm working on a system based on a NodeMCU/ESP8266 WiFi controller, which controls two separate motor units, each consisting of a 12V motor and solenoid actuator. For practical reasons, I need to ...
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2answers
67 views

Is the Arduino ground or the common ground the same as Earth ground? Why or why not?

Is the Arduino ground or the common ground the same as Earth ground? Why or why not? Is the Arduino ground or the common ground the same as Earth ground? Why or why not?
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2answers
172 views

Common ground with 2 transformers

Beginner question so please go easy on me. My question is around what is the correct way to have a common ground reference on a circuit at that 2 different voltage sources. the below schematic is a ...
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1answer
42 views

Grounding one port of SPDT analog switch

We are using a micro-controller to interface RGB matrix (HUB75 connector). Matrix row can be selected using signal pins (A-E). Some RGB matrix suppliers require to use (CLK/DIN/OE) on (A/B/C) pins to ...
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Flooding GND plane in the top side has any problems?

Hope Everyone is doing well. I got confused in the grounding of PCB. I checked many open hardware boards I noticed they don't flood GND plane in the top side to connect SMD components( all components ...
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1answer
70 views

Can someone explain this grounding phenomenon?

I went into a conversation with an electrical engineer. Here is what was on the table: Me: How do you connect a two-phase load to a three-phase delta load? If the loads were Y-connected, then you ...
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0answers
95 views

Servo motor and EMI noise on peripheral devices (microcontroller)

I have 6 servo motors (DELTA ASD-A2-0121). Peripheral devices are affected by EMI noise (When motors are in on state and have no movement). I have changed the ground system from series mode to ...
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1answer
28 views

Referencing multiple differential pairs to ground before analog multiplexer

Yesterday I asked how to properly reference a differential signal (in my case from a current transformer) to ground, and got told that the impedance to ground should be matched at the location where ...
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61 views

Audio Signal ground to earth ground?

I have a NAIM amp (some audio amp) working very well. Recently, added a ARCAM phono preamp (some pre-amp for turntable) to it. Once the phono preamp is connected to NAIM amp, there will be clear buzz ...
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1answer
28 views

Common mode noise rejection and grounding instrument current transformer

Suppose we have a signal from a current transformer over a pair of transmission lines. In order to prevent the voltage between the terminations of either of the transmission lines and ground from ...
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1answer
74 views

Why do Op amps need dedicated grounds to source?

According to the author of this schematic the bias currents will not flow without a power supply-input signal common ground. I don't understand why the bias currents wouldn't just flow into the ...
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1answer
82 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 ...
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1answer
39 views

GNSS module direct grounding to ESP32 increase sensitivity

I have a simple cirquit that composes of the following : ESP32-DevKit-LiPo (ESP32-WROOM) GNSS Module Beitian BN-357P with ufl connector for external antenna GNSS Active Patch Antenna My simple is ...
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1answer
30 views

How to verify whether an electrical appliance is properly grounded?

I read that an electrical appliance/equipment that is not properly grounded can kill people, especially if it uses mains socket where the current drawn can be high. In fact, even a simple microphone ...
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1answer
39 views

Can I connect DC GND to AC earth? If so, what is the purpose?

I am trying to use the circuit shown below in the picture. In the circuit, from the AC supply, the PE is connected with the ground symbol. I assumed I need to connect PE (protective earth) with the DC ...
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1answer
17 views

How do I wire a trs jack to a dual channel amplifier?

So I have a bluetooth audio amp circuit board. I believe it is dual channel it has two chips (one for left, one for right) The outputs are R+ R- L+ L-, but I want to wire them to a trs jack, which has ...
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0answers
43 views

Why is there 10VAC between me and a gas oven, 50 VAC between me and an electrical oven, and 110VAC between electrical oven and gas oven?

I have a gas oven which connects to a metal gas pipe, this oven can be considered grounded through the gas pipe, (the oven is not grounded in any other way). I also have an electrical oven which does ...
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3answers
96 views

Is there any alternative to the use of a ground wire? [closed]

Is there anything that can be used as an alternative to a traditional grounding pole that is buried in the ground? Is it possible to use a lightbulb, a series of lightbulbs, or maybe an inductor in ...
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2answers
91 views

Dc power supply outputting sine wave at both terminals

I connected a DC power supply (set to 706mV) to a 1kohm resistor as this: The semantic is like: However, strange things happen when I use the oscilloscope to view the voltage waveform at point A and ...
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2answers
55 views

PCB return path for Ethernet signals

While working on a new design, we had to route Ethernet signals on our PCB. My colleague and I has some discussion on how we should handle the grounding around the Ethernet signals, and their return ...
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2answers
56 views

In an isolation transformer, to what is the electrostatic shield winding attached?

In the following diagram of an isolation transformer, found on Wikipedia here for the diagram and also here for the definition of Isolation Transformer, there is a special winding in between the ...
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3answers
572 views

Confused about opamp's inner “ground”

(well. I am NOT speaking of "virtual ground" throughout this question/) As this figure has shown an opamp can be viewed as: We all know that an opamp like this has two inputs and one output ...
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3answers
112 views

Does connecting neutral to chassis (bootleg ground) rise chassis potential to main's voltage with respect to ground?

I know that bootleg ground is dangerous and should never be done, I am just using it as an example for my question, I probably have a fundamental misunderstanding about current flow and voltage, ...
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1answer
63 views

How do dual output in waveform generators make sense

I'm a noob in electrics and getting very confused with experiments about the electrical instruments' grounding... I have a dual output waveform generator like this (ignore the 'sync' as I don't use ...
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4answers
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Is ground connection in home electrical system really necessary?

I know that the answer to my question is "Yes, it is!". The ground connection is needed to avoid a person touching a metallic part of faulty equipment to be electrically shocked. So the ...
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1answer
69 views

What to use for neutral protection

I need information on "the protection of distribution system through effective grounding techniques." I want to know the possible protection schemes for neutral as fault current or return ...
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2answers
117 views

How do I create a ground on a PCB when I also need a positive and negative voltage supply for an Op Amp? What even is ground?

So I am using an OPA1612 op amp and I need positive and negative supplies for my application. I intend to use a 9 volt battery. This is the circuit I plan to use to get a +4.5V and a -4.5V. You can ...
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0answers
31 views

How do I properly ground DC and AC in the same enclosure (DIN rail)?

I am building an electrical panel with AC and DC supplied power. My AC ground wires connect to a green DIN rail connector which has metal on the bottom of this terminal and connects to the DIN rail ...
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34 views

How do I properly ground AC terminal blocks on a DIN rail and respective back plane?

I am building an electrical panel with AC and DC supplied power. My AC ground wires connect to a green DIN rail connector which has metal on the bottom of this terminal and connects to the DIN rail ...
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1answer
52 views

Electrostatic Discharge on new Workbench Setup

I'm setting up a table at home to do some electronics work (assembling microcomputer kits like the Maximite 2 and similar projects that require handling of sensitve IC chips). I have a desktop lamp ...
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39 views

Where to properly terminate 4-20mA cable shield in ungrounded low voltage DC system?

Preface: I read both: ungrounded chassis shielding and: RS485: Where to connect the cable shield in a battery-powered system? A sensor system I'm working on is getting installed in a 20x20' cement ...
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1answer
143 views

Non-contact voltage tester beeping near anything metal in my house?

Ok this is my first post so apologies if this is inappropriate but I need some solid opinions from guys who know about house earthing So me and my dad just moved into an old house and I was walking ...
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2answers
79 views

Single-point ground vs multi-point ground - large DC system

So we're working on a DC system with little space for cabling and a size which requires at most 1.5m cable length. We're running power on 48V DC (hence, frequency = 0) with a max of about 5Amps per ...
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0answers
62 views

C8051f06 16-bit SAR ADC is always reading on maximum even when it is not connected to anything

I recently fabricated a circuit based on the C8051f06 reference design. When I test the 16bit SAR ADC example code, the values are always on maximum value. I have the idea that my soldering iron is ...
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0answers
47 views

Which ground plane connection will perform better in terms of EMC? [duplicate]

In figure 12 of these EMI Design Guidelines for USB Components, I can see that VBUS and Gnd signals from the USB receptacle are bypassed with ferrite beads and then connected to their respective power ...
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42 views

Digital and Analog Power and Grounding

I have been reading about grounding lately because I learned that this issue is very important for high frequency design and I got the idea that we have to think about the return current to avoid ...
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2answers
77 views

Current on human with grounded electrical device

Assuming I have a grounded electrical device, for example a microwave. The left drawing shows that the phase wire is connected (due to a fault in the wire) to the microwave case, and an electrical ...
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1answer
77 views

What is best to use for a desktop computer, 2 prong or 3 prong power plugs?

We purchased a second hand NEC desktop computer and just lately we had a long beep problem that occurred. I figured it might be the RAM, so I disassembled the system unit and cleaned the RAM. However, ...
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77 views

How do I solve this gate with constant voltage at both ends?

I'm trying to understand the behaviour of the circuit in the work "Polynomial-time solution of prime factorization and NP-hard problems with digital memcomputing machines" for a project. I'm ...
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3answers
706 views

Can I assume that groundings in electrical circuits can be split?

Assume there's a circuit like this: What I'm asking is if I can split the grounding points like this: The reason I want to do it is just for simplicity sake. I don't have an excellent physics ...
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0answers
24 views

RS485 Communication Issue Adm2483

I have Setup like this for my application. I have Transformer which gives out 12V 1A & 5V 500mA output.I have used isolated ADM2483 design where power galvanized isolated. Primary side 5v &gnd ...
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1answer
86 views

How to measure if there is current between point A and B when source and grounding is unknown

I understand the headline makes little sense, so here is a clarification on what's going on. I used thick steel rods to create a second floor (loft) in my apartment. Those steel rods are attached via ...

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