Questions tagged [grounding]
Problems related to the connection of circuits to ground or earth references. Can affect safety, accuracy, reliability and interfacing.
723
questions
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1answer
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 ...
0
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0answers
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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0answers
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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0answers
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 ...
2
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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 ...
0
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3answers
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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0answers
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 ...
-4
votes
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 ...
-2
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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 ...
0
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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 ...
0
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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 ...
2
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0answers
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 ...
0
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1answer
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 ...
0
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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. ...
0
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0answers
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 ...
1
vote
1answer
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"...
0
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1answer
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 ...
2
votes
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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0answers
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 ...
1
vote
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 ...
0
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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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0answers
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, ...
0
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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, ...
0
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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 ...
0
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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 ...
2
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0answers
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 ...
1
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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 ...
1
vote
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 ...
1
vote
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 ...
4
votes
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 ...
1
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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.
3
votes
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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0answers
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 ...
0
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0answers
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 ...
0
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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 ...
0
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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 ...
1
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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 ...
1
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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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0answers
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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0answers
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 ...
0
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0answers
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 ...
0
votes
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 ...
0
votes
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. ...
3
votes
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/...
0
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0answers
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 ...
1
vote
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 ...
0
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1answer
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 ...
0
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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 ...
1
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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 ...
