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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37 views

Main water line TDS measurement grounding

I am trying to implement a TDS sensor to measure a main water line connected pipe, with circuitry that is powered from the wall. My TDS circuit is essentially a two electrode conductivity probe ...
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16 views

Help with reading a scheme for car locking control box peugeot 306 1997 [migrated]

I have Peugeot 306 from 1997 and I have a problem with the locking system. When I'm trying to lock the car it attempts to lock all doors, but then immediately unlocks all doors. I had a problem with ...
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49 views

Can current absorbed by a shield of a cable be harmful to a human?

I wonder if I should isolate shielding everywhere throughout the system. It is a bit costly because shields are on the outside and tend to touch a bunch of outer metal parts. But then humans can touch ...
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64 views

How to prevent common ground circuits messing with each other

I made an Arduino based 18650 battery tester that has 4 identical circuits that charge and drain. Testing one battery at a time gives one set of results which I deem to be correct but testing more ...
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1answer
247 views

Metal enclosure grounding for audio project

Fellow engineers, For various reasons I picked extruded aluminium enclosure for my current audio related project. All exposed metal connector chassis are connected to earth, which then goes to ground ...
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88 views

Grounding for a battery

Given a 9V battery as the only voltage source for a circuit, where is the Ground usually put? Is there a standard, for example, that puts the negative terminal at 0 and the positive at +9? Does it ...
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61 views

Bonding Electric Vehicles: Which System to Implement (safety)?

I am currently working on building an autonomous electrical vehicle and would like some input on which bonding system would be safest and most practical. The system battery is 48V (dc) and which feeds ...
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1answer
109 views

Are paperclips conductive enough for anti-static purposes? [closed]

I have recently discovered that I am a very silly man. Despite this, for the purposes of laptop repair, I still want to ground myself without spending any more money. I have recently come in to the ...
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4answers
120 views

Can I safely ground myself by clipping an anti-static wristband to a half-inserted plug?

I'm having some trouble grounding myself for laptop repair. I cannot get the crocodile clip of my anti-static wristband in to my plug socket (I'm in the UK, so our sockets are a bit difficult) and I ...
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1answer
44 views

Sharing a single ground wire across multiple RTDs

Consider the following, simplified schematic for a single, two-wire RTD sensor: simulate this circuit – Schematic created using CircuitLab The two wires from the RTD sensor plug into pins 1 ...
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3answers
100 views

What is the rule to put grounding in the circuit schematic, and what is that grounding for?

Already so many discussions about grounding. But the more I read, the more I got confuse as there are many disputes. The above are cases where grounding are quite confusing. Grounding or earthing, I ...
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53 views

Connecting a multi-PSU server on different lines with different earthing

I am currently preparing to set up a new server which has two PSUs (for supply redundancy). Of course it would be logical to connect them to different sources, but the situation I'm dealing with ...
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44 views

Ground offset or common mode noise voltage

This is just a small doubt I would like to clear. Suppose I have a buck regulator providing output at 5V and 1A. Suppose I measure the output voltage at the ground pad of the output capacitor and it ...
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3answers
120 views

Is EMC shielding of a grounding wire required?

Consider the following 2 use cases: Fully electric vehicle with 2 different insulated voltage systems: 1 high voltage @1000V DC insulated from chassis and 24VDC system with minus pole (-) at chassis. ...
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51 views

Ground Loops in Power Circuit

I have a circuit with both logic-level control ICs (5v) and power electronics (FETs, relays etc @ 60v). I am powering the logic level supply from a USB power bank and the power side from my lab bench ...
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61 views

AGND and GND - Grounding in Schematics

I have seen a few electrical schematics where there are separate symbols for grounds. "Agnd" and "Gnd" Can someone help me understand what are the differences between those two and where to use "Agnd"...
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77 views

Should I see noise on an outlet ground?

If I place the probe of my Rigol oscilloscope on the metal casing of the outlet box I can see a lot of noise on the scope. The noise definitely coincides with actions of nearby machines with motors ...
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1answer
153 views

What causes my mcu to blow up when hooking up with oscilloscope?

I was observing some timer signals yesterday, earlier in the morning I had my oscilloscope on another lab workbench where I would first make some changes, reflash the board and then take it to that ...
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62 views

Conducted Noise On Earth Ground Created by Forklift Battery Charger

INTRO: I work for an AGV company trying to integrate an OEMs battery & charger into our application. I can't go into too much detail since I'm under and NDA, but I'll do my best. DESC. OF ...
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2answers
116 views

Which one of these is the phase 1? [closed]

Which one of these is the phase 1? And why isn't there a neutral wire at all? The cable is Chinese. The device it powers is a 3-phase motor that powers hydraulics. I am sorry for asking this question ...
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1answer
47 views

Power Supplies - Voltage and Current

This is just a basic clarification I need. I have this Power Supply I always connect the red and black terminal to my circuit. I have never use the green terminal. I understand that the green ...
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1answer
63 views

How can I ground the external shield of the USB cable?

Currently, we're trying to carry out electrophysiological recordings from the mouse brain using Open Ephys acquisition box and a silicon probe, and we are suffering from severe noise in probe signals. ...
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72 views

Can I create a common ground between a rectifier and USB powered microcontroller?

I am working on firmware to decode the Marklin (MM/MFX) track protocols using a PSOC 5LP micro controller. Is it possible to create a common ground between the track ground, micro controller ground, ...
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1answer
44 views

Ensuring 'common' ground on my devboard : powering externally, + JTAG + VirtualCom with USB

Before I ask, I did see other similar posts, but it's not easy for me to apply them (I'm not an experienced EE..). My question in brief is, how to get common ground, to avoid potential gremlins. (Or, ...
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2answers
62 views

Connecting GND planes on PCB

In my PCB, there are two GND polygons (1 & 2) which are connected to the same GND plane. The only way I was able to connect them was through vias as shown below: I realized that two current paths ...
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2answers
89 views

How do 100mA ELCBs provide human protection?

Usually we use 30mA rated ELCBs in our homes. This is for our own protection against leakage current. But in instances where you have a 100mA or 250mA 3 pole ELCB used in industry, an earth leakage of ...
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64 views

Why should the primary winding of the transformer not be grounded?

I've been wondering what would happen if you grounded both star points of a Y/Y connected transformer. This shouldn't affect the voltages, so why really is it not advised to earth both the primary ...
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1answer
91 views

PCB ground plane noise

I have designed PCB for my buck converter. When designing the PCB I've created, I have made one ground plane as shown. I received the PCBs and there was noise in the TL494 affecting fixed 5V Vref ...
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1answer
33 views

Current flow in trailing edge dimmer

I was trying to learn something about dimmers for light bulbs. After some reading, I found that most trailing edge dimmers contain some variant of this: Found for example in this diy-project or this ...
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1answer
68 views

Ground Plane Layout for Power Supply on PCB

I'm in the process of designing my first PCB. For the power supply, I have a 4.5V battery pack fed into a voltage regulator that outputs 3.3V. This section of the PCB and governing schematic are shown ...
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2answers
122 views

The Pin 1 Problem in Audio, Star and Mesh Ground, and Contradictory Grouding Practices in Audio and Digital Systems

I recently came across the concept of "Pin 1 Problem" known in the pro-audio electronics. It seems straightforward at first, but becomes confusing when it comes to grounding. Let me describe the ...
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1answer
136 views

Do I need to tie every ground pins of esp32 wroom 32 to the ground

Which is the proper way of grounding for the module To avoid the ground loop I think fig. A is the best.
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3answers
131 views

Why doesn't electricty flow to earth ground when I connect my oscilloscope ground clip to a floating circuit?

There are two concepts I keep reading about that seem to be conflicting each other. Firstly, whenever there's a potential difference between two points, and those points are connected, electric ...
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46 views

Should I connect metal enclosure to -V or to virtual ground?

I've built a headphone amplifier powered by a switch-mode 2-pin wall wart power supply. Internally a virtual ground is created by dividing and buffering the supply voltage. Input and output signals ...
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34 views

Rc filter to ground

On one of the machines I'm working on we have a cabinet that ties parallel resistors and capacitors to a machine ground. The cabinet is in parallel with the machine's main transformer and the ...
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3answers
68 views

Test grounding of wall sockets

I just had (and solved thanks SE) a problem with a wall socket where the ground contacts were malfunctional. Much of the electrical safety relies on proper grounding. As far as I can read, details for ...
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3answers
62 views

120V between chassis grounds of two different devices [duplicate]

After experiencing a notable shocking type sensation after coming into skin contact with my laptop and phone (both metal and plugged into their chargers), I decided to probe the chassis of both ...
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2answers
49 views

How to connect multiple ground pins in a FFC connector

So I have a bunch of these FFC connectors shown here, and a lot of the middle pins are actually ground pins (highlighted in green). I have a multi-layer board, so I want to route all these grounds to ...
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2answers
115 views

What to do when there is no ground cable?

I'm trying to connect a heating cable (heating tape) which is constant wattage type. This cable requires 240V. However, I realized there is no ground cable as you can see in the picture below. it only ...
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52 views

Grounding polycarbonate or Plexiglas

If a record turntable's base is made from a 2" think piece of acrylic (for instance polycarbonate or Plexiglas) can it be successfully grounded to eliminate any static charge that it would build up in ...
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30 views

What's the proper way of mounting surge arresters on TN-S system?

I'm attaching a diagram with surge arresters put on each line. Most of the experts in the field say a proper defense against lightnings and switching events has three surge arresters - one between ...
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25 views

Connecting to motor controller input ground drops system voltage

I am currently working on installing photoelectric sensors into motor controller inputs. The inputs to the motor controller are 24V open ended inputs. The supply source is a 48/24 V buck chopper. When ...
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1answer
42 views

PoE Design for Camera Interface Isolation Question

We are designing a PoE design to power our camera. The block diagram below is the basic design we are planning to implement. I want to get some advice to make sure we will not be damaging our camera ...
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1answer
90 views

RFID reader sensitivity/read range - How does a “hard” ground increase sensitivity/read range?

I'm working with two RFID readers in my circuit and an arduino to control both of them. The whole thing is powered by a very cheap wall-wart Power supply at 12V which is rather noisy to begin with. ...
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1answer
90 views

What to do with ground wire? [closed]

I have a few I/p transducers(which work on 4-20mA loop current) and I have made a single cable for all of them, they each have posititive, negative and Ground wires. The controller I have for these I/...
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38 views

Differential input pH schematic reading

I am trying to understand the following schematic for a differential input pH probe. here is the link A1 and A2 role are unity gain opamp amplifying high impedance probe signal, while A3 makes the ...
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1answer
56 views

Do all common grounds end up to the chassis ground?

I'm new to electronics, and still wrapping my head around "common" and "ground." The schematic is: My question is if ALL the solid black grounds/commons end up at the one going to the cap/resister ...
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57 views

fault current through a person

Say a person touches the live wire as shown in the first attachment, the current will flow through him and dissipates into the ground as shown in the second attachment right? the fault current through ...
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1answer
74 views

Grounding considering signal return path

I wanted to ask if there is a difference between 2 scenarios on the illustration i've included. If we have 2 or more boards interfacing with each other should we connect every output with it's own ...
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2answers
82 views

Is a ground plane meaningful even where the signal return path is not through ground?

I'm designing a two layer PCB for a keyboard where most of the board space is taken up by the key switches and backlight LEDs. The switches have a traditional switch matrix configuration with diodes ...