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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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Is this correct way to connect chassis ground to digital ground?

I'm currently working on a PCB and I'm not sure how to connect a digital ground and ground chassis. The picture shows the PCB layout where you can see the 3-pole power connector (L, PE and N). Pin 2 ...
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52 views

Replace a relay with an analog switch

I'm trying to replace a relay with a SPDT cmos analog switch MAX4678 for switching a sine wave, The switch is powered with dual power supply +5/-5 and +5 to its V_logic pin. This is what i got in ...
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Why did this arduino burn out? SilentStepStick (TMC2130) stepper at 24V

I'm new to electronics. Attempting to bench-test a SilentStepStick stepper driver board, (based on a TMC2130) Using: Arduino Uno, a SilentStepStick driver board, a 0.6A stepper motor, and waterott ...
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1answer
33 views

PCB antenna and SMA connector

I have a question regarding an integrated PCB Antenna that I would like to try out, however, if it fails I want to be able to use another SMA antenna. The PCB Antenna is an inverted F-antenna meaning ...
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2answers
688 views

GND plane and vias on a two layer PCB

I'm trying to build my first two-layer PCB layout using this example schema: I'm using SMD elements, which I would place on the top layer. Also I would create a ratsnet area as GND on the top layer. ...
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1answer
97 views

USB shield for analog and digital ground?

I'm new to Mixed-signal design and I'm having trouble deciding how to connect my digital and analog ground. I'm doing a 4 layer design, so I have a split ground plane. As I understand, since I'm ...
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Off Grid PV System Grounding Question [migrated]

Hi I am installing an off grid solar system form my orchard and shed. Basically there are some pumps, lightning and some household appliances like refrigerator etc. I have read many articles about ...
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2answers
79 views

Putting GND on POWER layer

I have a four layer PCB, with a traditional: signal layer, power layer, ground layer and final signal layer. Due to the set up with the power rails, there are some large spaces on the power plane ...
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1answer
28 views

EAGLE - how to make ground planes to connect to the smaller PADS

I cant fid how to configure the GND polygon to connect to smaller IC pads: EDIT Following the @Dave Tweed answer the result is exactly as I need:
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2answers
69 views

reason to have entire Cu layer as GND connected through via (KiCad)

This is the first time I am designing a PCB and I was looking at example PCBs drawn in KiCad (the image below is my first PCB, to remove any sources of confusion). I noticed that oftentimes, when ...
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55 views

how can accsess gnd in full wave rectifier? [closed]

in full wave rectifier without transformer how can access to gnd for regulator or gnd of microcontroller? (assume we dont have trouble with amplitude of voltage) I think in full wave rectifier in ...
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Pour ground plane fails in Circuit Studio

could you please advise on the following topic: First time I make a ground plane in circuit studio. I really follow the tutorial. I select the pour polygon as you see. Ok here I named the plane GND,...
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43 views

Three Different Voltage Lines, Same Common Ground?

I am trying to send PWM, clock, latch and blank signals from Arduino through a series (16) of TLC5940 Breakout boards and on to a grid of 512 individual controlled LEDs six feet away (RJ45). I am ...
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1answer
31 views

Altium Gerber File Copper Breaks

I'm getting some really weird effects on my Gerber File outputs from Altium Altium 18.1.9, using OutJob Files, here are my settings My layers look completely normal with a copper pour for the ...
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56 views

RS232 signal ground

I have serial sensor wich i need to connect to a datalogger via RS232 interface. Sensor powered by datalogger. But datalogger have no signal ground pin, only power ground. So i connected sensors ...
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Ps3 power supply not outputing 12v

I want to repurpose my ps3 power supply as a power source (independent of the ps3). In order to get 12v output I have to connect its 4 pins in a specific setting (or else it won’t work). My power ...
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1answer
45 views

mains earth and op-amp ground

I was trying to power a transimpedance amplifier built with an op-amp on a protoboard. I only had a power supply that looked like the first image below (no COM, which I would have connected to GND ...
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345 views

Power supplies with or without 'COM' and without ground port at all

This is probably something really simple, but I wasn't able to find the answer yet. I've been using a power supply with both COM and earth ground, like the first image below. To power an op-amp, I ...
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3answers
94 views

How to find Voltage based on reference nodes?

I came across this problem and I'm trying to really understand it. VB is the voltage drop across a particular element, it is the change in voltage from node a to node b. Find the value of VB in ...
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1answer
90 views

Wire to VDD or GND?

In the circuit below, there are four LTC485 ICs, one input (left), three for output (right). Pins 2, 3 and 8 are going to +5V, as well as GND. So where should I connect them to? Should I wire them all ...
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low impedance as GND and current measurement, applied voltage sharing the same lead

(Image 1 is for the general idea, image2 is for questions 1 and 2, image 3 is for the 3rd question) In the setup shown below, the tuning fork is driven by an AC voltage source being connected to one ...
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1answer
69 views

GND connections and ground plane routing?

When I let Altium do autorouting and then I define a ground plane using a polygon connected to my ground pin, I often get layouts where a GND line is flanked on both sides by the GND polygon, and then ...
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53 views

Bi directional logic level converter not dropping voltage to ground

I made a Bi directional logic level converter according to the following document https://cdn-shop.adafruit.com/datasheets/an97055.pdf but am experiencing a weird behaviour. One side is connected to ...
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1answer
28 views

Long vs Short Earth Connection for Single Phase Motor vs 3 Phase Motor Frame

What is the correct way of grounding single phase motor frame if I have to choose between two options: (1) Short to earth connection: from the frame to nearest grounding rod. See below the schematic....
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459 views

Single ground plane vs split planes?

I have seen conflicting sources about ground plane design. I have been told at my work many times, just slap a single massive ground plane in and that works well enough, we don't deal with anything ...
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1answer
62 views

How to build (from scratch) a GFCI Circuit? [closed]

I am looking to understand what is the circuit inside a Ground Fault Current Indicator (GFCi). What does the circuit look like? Simple google search is not yielding good results about the guts of it.
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278 views

Why am I getting shocked from “hot” line and touching “ground” (Earth)

So I live in an EU country and don't have Earth grounding for my house. Still I am getting shocked when touching "hot" line (220VAC) and standing on "ground" (Earth). How is this possible? From my ...
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strong noise in microphone unless usb receptacle is grounded

I installed a Banana Pro (like Raspberry Pi), plugged an usb audio stick in, and a microphone in it. I run this thing with a properly dimensioned usb power supply (tried different ones). This way, ...
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46 views

Questions about earth grounding enclosures

A text mentions about the importance of connecting the earth wire to an instrument case/enclosure as follows: Instruments with ungrounded cases can become lethal devices in the event of ...
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1answer
61 views

Strange thing with 5mm LEDs and variable PSU

I have 3 standard LEDs (not COB just the tiny regular ones used in circuits with an Anode and Cathode in epoxy lens), I was just testing them today doing random things with them: 1.9v - 2.1v = red 3....
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3answers
134 views

Reversing USB power polarity, but no black wire

My goal is to create a USB-to-USB cable with reversed polarity in order to charge an old Gameboy Advanced SP. I could just go on Amazon and buy a charging cable, but I do enjoy a fun little project ...
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1answer
73 views

How to connect one pin to ground when an another analog pin is triggered

I'm trying to combine two working electronics projects into one. I have a standalone piezo sensor that I can read values from when it vibrates via an arduino, and I have a standalone audio board (no ...
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89 views

DC Power Jack - minus to chassis?

Is it OK to connect the minus from a DC Power supply, 15v 4A (switched) to a metal chassi as ground? No electronics will be connected to the chassi. The jacks that I have found seems to be made of ...
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1answer
42 views

KiCad netlist output GND not labeled 0 for Ngspice

As the title suggests, I'm having trouble generating netlist from KiCad for Ngspice, the problem being that I can't get KiCad to output a "0" node for "ground". I'm aware that I'm supposed to use the ...
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2answers
84 views

Ground loop via pull-down resistor

I'm developing an STM32-based device, one of whose functions is to periodically monitor the main power 12V battery voltage. I created a simple switching circuit with a voltage divider. I have added a ...
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3answers
120 views

Why Micro-controller Pin is connected to ground via Capacitors? [closed]

I am analyzing a circuit which uses an Micro-controller to measure analog signals rms in digital form. There is one connection of circuit that i am not sure what it does. See the Figure. Here Vref ...
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1answer
48 views

Need a help with adjustable DC power supply

I just purchased an adjustable DC power supply. https://www.amazon.com/Variable-Eventek-Adjustable-Regulated-Alligator/dp/B07DQR177D It has three terminals : "-"(black), "ground"(green) and "+"(red)....
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58 views

Capacitors, ground between connection, Colpitts oscillator

For the Colpitts oscillator circuit shown (from a YouTube video), the video author said that the capacitors C1 and C2 are in series, which makes sense since there is a common connection point for C1 ...
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1answer
30 views

Sharing ground between devices connected to same power supply

Several Raspberry Pi projects I've seen, using two modules, have a jumper wire between both GND pins, when a physical connection between one or more pins is needed between both modules. What is the ...
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2answers
57 views

Ground Plane Net Tie - Question about current design

I am doing net-tie method to separate two different Ground Planes (for noise mitigation purpose), one ground plane is for RF circuitry and MCU, the other ground plane is for power and motor switching. ...
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49 views

Reverse current common ground two voltage sources

I am trying to build an soldering station similar to the one marco reps made. the cable to the iron itself has 3 wires: blue for heating element, red for thermocouple and green common return. I am ...
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1answer
97 views

Extra small RF PCB antenna - GND plane

My new PCB design is about 25 mm * 25 mm, this is not enough for a proper 868 MHz antenna ground plane, I am using the 0868AT43A0020 chip antenna where at least a 20 mm * 40 mm GND plane is required. ...
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1answer
68 views

understanding of UART , if two devices share a common ground. How do they get to the same voltage level for a save data transmission?

My question is related to the common ground in a UART communication. So far, what I understand how communication in general works is: Distinguishing the voltage between two cables (one is a GND and ...
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3answers
74 views

Most advantageous decoupling for multiple voltages

I'm trying to figure out if I can improve the elimination of noise. I always decouple my IC's by connecting VCC and ground together with a 100nF ceramic capacitor, But I'm curious. In each picture ...
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107 views

RF module behaves weird on PCB

I have a 2 layer PCB with GND planes on both sides. I have a ZigBee RF module that is placed on top of the PCB. I made sure there was no ground plane on both sides of the PCB that interfered with the ...
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1answer
84 views

turn on 12v from 2n2222a 5v source

simulate this circuit – Schematic created using CircuitLab I am trying to be able to switch off the motor, then energize or de-energize the relay coil for a motor direction change. I can't get ...
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64 views

How to measure signal from common-source N-MOSFET with ground-referenced oscilloscope?

Update: It was the LED on the load that dropped the voltage. I have problem measuring the voltage of signal from common-source N-MOSFET switch. Everything including o-scope is grounded and there is ...
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1answer
61 views

Eagle help- vias won't connect to GND plane

I'm trying to place some 100W wire wound resistors on my board and I'm going to be using my ground plane and some vias as my heat sink. I have a polygon labelled "GND" on both sides enclosed by a stop ...
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69 views

3 bare wire in USB-C

I bought a USB-C to USB-A cable from china. One plug did not last long and I decided to use it in one of my projects. The problem I ran into is that I could not find the ground wire. The foil was ...
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1answer
78 views

How to connect four different ground planes in the same PCB?

I am working on a project which uses the LTC4020 multi-chemistry battery charger from Linear Technology. The design includes a microcontroller ( NXP KL25Z) to provide additional outputs and ...