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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How to find earth ground point in circuit?

Despite being a complete novice, I am well-read on the hazards of clipping an oscilloscope's ground lead to a voltage above earth potential (assuming a properly-grounded scope.) Setting aside the ...
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Port expander with high side switch ground dilemma

I have a design wherein the basic idea is to control individual LED strings and dim (analog dimming) them using Pi Pico via I2C interface. This board is the LED driver which will be connected to the ...
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Grounding sensors to large bodies

I've attached a diagram of what I'm talking about. I have a large (600x300x10 mm) aluminum block in which I place thermistors to monitor the temperature distribution in the plate (in a standard ...
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Groundwater pump star-delta phase voltage confusion

Last time I got good answers for my question here so I came again today. Thanks. 🙏🙏 The problem am facing today is in star delta starting motor. When I connect motor to contactor, in phase to ground ...
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How to check if my outlet's Ground and Neutral is wrongly mixed up or correct? [migrated]

When we moved to a new house I noticed a strangely wired up outlet: For this outlet, I am really suspicious whether the grounding is messed up and mixed up with the Neutral. Normally Neutral and the ...
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2 layer PCB grounding

I have a 2 layer PCB that contains an ESP32, a LoRa module, a GSM module, some connectors to command relays and 3.3V & 5V power rails. My question is, should I set both layers as ground planes or ...
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Eagle I can not change the isolete value of bottom Ground polygon

well this is my PCB design with Eagle Autodesk. Ground polygon looks perfect with Isolate value 0.8128 [mm] on Top. but this value can not effect bottom polygon Why? How can apply 0.8128 isolate ...
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Isolating RF Ground is it wise?

I am designing a GPS module and I am planning to isolate the RF GND from the DC power supply GND with an inductor. I have chosen the Murata LQW18CN4N9D0ZD because the low inductance will have low Ldi/...
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Chip antenna ANT161575ST-1202A1 layout question

I am designing a GPS module using the following chip antenna: https://product.tdk.com/en/system/files?file=dam/doc/product/rf/rf/antenna/catalog/rf_ant_ant161575st-1202a1_summary_en.pdf The datasheet ...
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3 votes
7 answers
215 views

Why is the ground pin always connected to the "negative" power supply?

Please try to explain this in a way that I will understand. This is extremely frustrating for me. And try to explain where my confusion lies. I'll try to explain my frustration. Every piece of ...
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When to employ RF shield cover on PCBA?

During reparations and teardowns I have frequently come across PCB-mounted RF shields and covers. While I don't typically work with GHz processors or design RF modules I wonder if such covers could be ...
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What can cause a surge in one 110 V line feeding a 240 V appliance, melting the connector?

One of the Hot wire (#10/3) going to my oven appear to have experienced a sudden very high in rise temperature inside the junction box, melted the connector, creating a contact with the face plate ...
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1 answer
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Analog ground and pgnd in proteus

I am doing a project on proteus,I cannot find the ground terminal, where can I find AGND(Analog ground) and PGND in proteus?
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Made a mistake when Jumpstarting the Car

I made a mistake in connecting the cables for jump start. Instead of attaching one of the negative cables to the negative pole of the donor battery and attaching the other negative cable to a metal ...
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1 answer
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Symbol for potentially dirty ground

I have a net which, although should be ground, could potentially be dirty and contain all sorts of minor noise. What is the correct way for me to denote this in my schematic?
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GND related - maybe off topic

Situation - listening to music via Bluetooth using an integrated amplifier. I removed the GND wire from my pick up/turntable wich was connected to the amplifier. While removing it from the amplifier ...
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Why is my buck converter stimulation not working on proteus?

Why is my proteus stimulation only outputting the voltage and current zero when I connect the ground terminal - shown at the bottom right of the image, when I do not connect the ground terminal the ...
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4 answers
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Very confused about where "ground" is connected

I actually don't know that much about electronics, but I'm very interested in learning more. I watch Ben Eater on YouTube, and whenever he needs to connect the part of a chip to ground, he connects it ...
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Why do some electronics have two power/ground pins?

I was looking at the BMP280 temperature/pressure sensor schematics on KiCAD, and I saw that it has two power pins, and two ground pins. Why is that? Please let me know if more information is needed on ...
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2 votes
1 answer
261 views

How to attach ground on a breadboard from a schematic?

I'm trying to build a circuit on a breadboard based on a given schematic, but I'm not sure how to "ground" components on it like how it is shown at node B: What I have done so far: What ...
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Why might my rack chassis have ground leakage?

I have a metal rack that contains a single item: A Samson S Patch Plus Patchbay. The patchbay is well isolated from the rack using nylon shoulder insulating washers, and I've thoroughly tested this ...
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2 USB cable stripped wires vs black unstripped wire?

Here is my simple little project , I have bought these 2 very long cables, USB cables, but with time the micro USB side which you connect to devices has been damaged on both of them, the USB connector ...
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Adding ground to the minus of the source

I'm currently learning Kirchhoff's law and a circuit shown in the picture came up. I had tested it in a circuit simulator and no current was shown to leak to the groud. Could anyone explain what ...
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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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common ground issue in signal transmission?

I am designing a device that output analog voltage in the range of -5 V to +5 V representing a certain measurement (single-ended earth grounded). My plan is to use a regular BNC cable, (earth ...
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difference between N and X relays?

I have seen in some SLDs for overcurrent relays there is a X unit and N unit. I understand that the N unit grounding relay is for zero sequence and the G unit is sensing the current flows through the ...
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UDFN Package, exposed thermal pad - to ground?

So I've got a design in which I would like to use the AT25SF321B-MHB-T chip by Dialog Semiconductors, but its datasheet does not mention whether the exposed thermal pad should be connected to ground ...
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2 votes
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Ground handling for USB device with multiple upstream facing ports

I'm building a keyboard with an integrated KVM, using an MCU with 2 USB device interfaces. I've been wondering what would happen if I connected the keyboard to two PCs powered from different ground ...
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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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Two-ground issue

I've been working on a project which I need to rectify, filter and later lower the input filtered voltage (311V) to 12V, as shown in the picture making use of a flyback converter. The problem arises ...
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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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How to make a separate common point for gate driver with 1 Voltage source?

So I'm trying to make a single board that can take care of bucking 120V to 56V. The circuit for that works. The TL494 Circuit below also works, and so does the gate driver circuit. This circuit works ...
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Keeping shapes/ polygons from going over same net trace in Cadence OrCAD?

I have an interesting situation where I have a current sense line that needs to be differential to ground. I'm trying to add copper pours to the top and bottom layers, however I can't pour over these ...
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1 vote
3 answers
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What happens to a signal when it passes by diodes that are connected antiparallel to ground?

What are diodes 1 and 2 doing in this schematic? This is the schematic for a distortion guitar pedal. Why doesn't all the current flow to ground through diode 2? How does diode 1 have any effect if ...
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6 votes
1 answer
258 views

What are the drawbacks of connecting circuit GND and Chassis via multiple mounting screws (for EMC and Safety)?

Although there are various suggestions around for how to connect circuit GND to the earthed chassis (say, the chassis has a point-to-point resistance of around 1 mΩ) in devices, there seem to be two ...
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Is it important to which GND I connect my relay (OR gate on signals from two different controllers with separate VINs)

I have a power supply (let's say 5V battery) and a NodeMCU (micro-controller) attached to it. I want to turn on the power supply for this NodeMCU #1 by signal from another micro-controller (from ...
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1 vote
1 answer
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Vl53l0x ToF Sensor turn on without gnd

My ToF sensor turn on if I not connected its ground pin to common ground (I let it float). Why?
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3 votes
2 answers
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Vintage turntable 50hz noise when touching tonearm

Hope someone can give some advice on this matter. I have a vintage Philips GP 808 turntable. There is this 50hz noise coming out from the speakers when I touch the tonearm. I don’t see any ground ...
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Connecting isolated grounds of TES1-2411

Traco's TES1-2411 DC/DC converter has isolated input and output grounds and it is obviously a needed feature in a lot of applications. However, I would like to use it in an application where I need to ...
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2 votes
4 answers
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Using a SP3T switch to connect 2 GPIO and the GND pin of an MCU

I tried looking for an answer for several days, but didn't have any success, so I thought I would ask here. I apologize in advance if this was already answered, and that I was not able to find it in ...
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1 answer
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How to get the Vcc and Ground of a regular arduino charger?

I need to run a Nema stepper motor and drive it using an arduino as shown in this circuit: As power supply I have a 12V universal charger: How can I get the ground and the VCC of my 12V power supply ...
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How can a resistor have an effect on a circuit if it leads directly into the ground?

I'm new to electronics and I'm coming from a programmers perspective so sorry if this is obvious. ][1 This is a voltage division circuit (just a simple example from wikipedia.) R2 leads directly into ...
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2 votes
1 answer
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Battery voltage measurement using ADC problem

I want to measure the open circuit voltage of an electrochemical battery using an ADC and an Arduino. I need to use the ADC in differential reading mode (A0 por positive and A1 for negative). ...
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1 answer
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EAGLE 7.7 do not fill GND polygon

Adding a polygon GND, but it not going to fill at all. Ratsnest - not helping. Orhans also not helping. Any idea?
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2 votes
3 answers
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Is there any difference between electricity flowing in earth vs. flowing in wires?

I wonder how the earth (real earth, not earth wire) works as a conductor in Single Wire Earth Return system, or in case of a fault in regular grounded systems. How far can electricity flow in earth, ...
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2 answers
60 views

Questions about LED strip circuit and current

I have several questions but I will split it up into two (main) questions. The first 'series' are about double LED strip 'controller' circuit. Below is the the I'm intending to use a (5V) 74HC595 ...
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2 votes
1 answer
153 views

Can I put 2 grounds of different voltage in parallel on a mosfet switching on/off the load

I'm not experienced but I don't mind burning stuff to get through, here I'm looking to find out why it's not working. I've got a 5V fan being switched on/off by a mosfet on a board I didn't made. The ...
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What would happen if earth ground and the PCB ground came into contact?

So I have an ATX PSU that I'm converting into a 12v, 5v power supply. I also have a group of 4 USB ports from an old computer that I connected to the 5v line of the ATX PSU. Unfortunately, the USB ...
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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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Charging by electrostatic induction

In the given figure, if we connect the positively induced side of the sphere to the earthing instead of connecting it to the negatively induced side, then will the sphere get negatively charged ...
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