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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signal ground and power ground

I'm making a PCB with two ground signals, power ground and signal ground. These two shall be connected together at one spot on the PCB, after recommendations from the datasheet. But how is this done ...
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488 views

Does a Connector With Multiple GND Pins Make a GND Loop?

There are some cable standards that have multiple GND pins on the connector proper. A good example of this is the SATA connector (it has 3 of them). In reality, each GND pin has a slightly ...
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52 views

Where do I connect earth wire?

I'm trying to use this delay timer to control an exhaust fan. I have a 3 pin connection (with earthing wire) powering this fan and it works fine. If I have to insert this delay timer module in ...
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54 views

Ensuring common ground in a circuit with several voltage requirements

I'm working on a project that has components requiring various voltages. 3.3v --- to power a set of laser diodes (qty 24 @ 50mA = 1.2A) 5v --- to power a set of infrared transceiver sensors (qty 24 ...
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33 views

Monitoring power from 3-phase AC generator

Hello all. The above is a circuit schematic (sorry for poor hand drawing) for monitoring power from 3-phase AC generator. The main goal of the circuit is to see how the power output varies depending ...
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77 views

How to detect current imbalance?

I would like a circuit that detects current imbalance between two conductors. The currents are normally equal and opposite in direction, but can vary in time (or reverse direction). Neither ...
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1answer
94 views

What's the purpose of the ground plane?

What's the purpose of the ground plane? I guess it's a pretty basic question and I tried to understand it by reading http://en.wikipedia.org/wiki/Ground_plane#Printed_circuit_boards but I still don't ...
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2answers
64 views

Am I going to encounter grounding issues with this PCB design?

This is my first time designing a PCB, and because it is part of a project at uni I have the intention of manufacturing it afterwards. The circuit itself is a voltage-controlled oscillator designed ...
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3answers
728 views

What is the difference between different types of GND

I would like to know the difference between different types of Grounds like AGND, SGND, Battery Gnd, PGND. Are all the grounds not same? Cant we connect the device to any one of these grounds?
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49 views

Do I need a ground plane?

I'm a noobie in pcb designing, so i created this one single sided board, do i need do add a ground plane if I have a ground trace? Cheers!
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55 views

Arduino in Ground-Chassis (Vehicle): Activate by grounding

I am working with an Arduino as a controller for an Aftermarket Heated Seats Kit and interface for the stock A/C Auto Control Panel (the car did not come with heated seats, and I acquired an A/C Panel ...
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75 views

Using a LM1875 instead of a LM675 for virtual ground

I've been gawking at the data sheets of these two, and I don't see any great disadvantage in substituting the TI recommended part (LM675) for the audio part LM1875 in this application (virtual ground, ...
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48 views

What is ground on a circuit that uses AC?

Below is a circuit diagram for a circuit that runs off AC voltage. Where do I connect all of the points that connect to ground? Do I just connect them all on the same rail of a piece of Vero board? ...
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1answer
127 views

Why does the GND of the Arduino oscillating as well?

I have an Arduino Uno and what it does is simply output an oscillating signal of 1 MHz on PIN11. I measured the signal using a oscilloscope and a probe with a ground clip. First, I connected the probe ...
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1answer
220 views

What are Vcc and GND on a shift register?

What are Vcc and GND on a shift register? I thought that I had to provide a positive voltage to the IC via the Vcc, but turns out that I can operate my shift register without powering the Vcc. ...
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1answer
582 views

Why is this resistor connected between connector shield and ground?

I was looking over my raspberry pi model B and I noticed a resistor between the USB power connector shield and ground. I've noticed this on many PCB designs with much larger packaged resistors ...
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1answer
56 views

Metal connector case connection when using a plastic housing

I'm designing a board with 2 SFP connectors and I am not sure what I should connect the cage pins to. The manufacturer recommends connecting the case pins to chassis ground but my product is in a ...
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1answer
80 views

Connect multiple grounds to one external connector in Eagle

For my project I've designed 3 power supplies, 1 5V, 1 3.3V for the supply of the micro controller and one 3.3V for 3 INA 226 shunt monitors. I do have some questions regarding the ground. de power ...
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1answer
72 views

Current Leakage calculations regarding shock hazard. A complete picture?

There is a quantity called current leakage which has always confused me. By reading various definitions, it seems to be the current flowing through the ground circuit of a device (whether this be an ...
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1answer
63 views

Connecting devices powered by separate SMPS without common ground

I have a power over Ethernet design using the SI3402 PoE PD chip to generate 3.3v for a pic 18F67J60. The switched mode voltage converter in the SI3402 is a little unorthodox in that it switches Vss ...
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3answers
130 views

What does short to ground mean? How to do that?

I've just started a simple project using raspberrypi and a capacitive touch sensors breakout board. I had a few problems using I2C, but after some time of research I managed to get stuck on one ...
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1answer
176 views

Floating supply and USB ground

I have a somewhat complex circuit controlled by an Arduino, which is supplied by a self powered USB hub (earth grounded 5V supply). A part of the circuit has to be powered by 12-20V DC. When I plug ...
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1answer
72 views

Can we consider that ethernet or RS-232 (RS-485) networks have no ground connection between the two ends of each cable?

This is for a huge home theater. I have a power transformer that converts 380VAC between two legs of a 3-phase power system down to 230VAC, with a center-tap of the secondary being our "neutral" for ...
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57 views

Switching Power Supply makes speakers hiss

I have a computer with a 5.1 soundcard, that I'm using to run a standard PC 2.1 setup (Corsair SP2500) on the main audio output, and two rear surround speakers I had laying around. The speakers in ...
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1answer
87 views

Power Mosfet design issue

My schematic The components BSN20 is a N-channel enhancement mode field-effect transistor (datasheet) IRF7416 is a HEXFET power MOSFET (datasheet) This is a part of a project in which the line ...
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1answer
54 views

Voltages with an earth ground

In this diagram, from what I understand the voltage between the positive terminal and the first earth ground is \$ 0V \$ and the voltage between the negative terminal and the earth ground is \$ 0V ...
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Why is the chassis used as ground in automotive electrical circuits

Automotive electronics generally use the metal chassis as the negative ground connector for the DC circuits. Obviously this saves something on wiring. Is there an electrical reason for this approach? ...
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72 views

Connecting grounds of a disconnected power source?

Background: I'm designing a portable appliance (24 DC, ~30 amps, air conditioner) and need to have a switchable power source between vehicle-supplied power (alternator) and a separate dedicated ...
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1answer
136 views

Noisy Voltage Rails (Vcc, Gnd) - Noise Isolation for Automotive Circuit

I have an audio (mic, speaker) circuit that I am currently powering off of a 12V car adapter that is fed into a 10V switching DC regulator to power the rest of the circuit. I have noticed a horrendous ...
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2answers
52 views

Setting the absolute potential of an isolated DC power supply

I have a circuit that, for reasons out of my control, is powered by an bipolar +/-4V supply. This circuit includes instrumentation amplifiers and so forth that have input headroom requirements of over ...
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1answer
121 views

Bypassing single supply op amps biased at mid-supply

When working with single-supply op amps biased to mid-supply ( virtual ground rail ) how does one achieve proper bypassing at the IC given that the virtual ground should be as noise-free and stable as ...
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2answers
296 views

PCB's and designing power connections

I've designed a few PCB's now, but never put much thought into good practices. They were small boards and most of the emphasis was put into just making sure everything that needed to be connected was ...
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2answers
143 views

Does a circuit going into an Arduino pin/GND need a resistor? [closed]

If a circuit goes into an Arduino pin, even the GND pin, but does not use something a component that needs a resistor such as an LED, does it still need a resistor for the Arduino pin? Edit: To clear ...
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631 views

How should I connect AGND and DGND

I have been reading about grounding in a mixed signal systems. Do I get it correct that it is best to group analog and digital elements and then have a single ground plane, as long as the digital ...
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45 views

triac DC ground and AC live

In this example of using a 3Q triac, could the AC voltage flow into the DC terminal?
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4answers
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Reason of multiple GND and VCC on an IC

What is the reason that most of ICs (e.g. MCU) has multiple (A/D)GND and (A)VCC pins? If it is to increase performance of an IC, how does it help to performance? or is it easier for the IC designer ...
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1answer
79 views

How to reduce objects/hands impact on PCB antenna efficiency

I am trying to learn about planar inverted F antennas creation and have designed two different designs for two different frequencies with success. One seems pretty much unaffected by the proximity of ...
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1answer
135 views

Does the ground line in a DC circuit carries current?

I'm confused a little bit about whether or not a DC return line carries any current. the reason is that in our design we have 2 batteries 24V and 8V, they supply ~4A and ~2A respectively to different ...
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1answer
75 views

Suppressing BLDC Motor noise? Is it radiated or a grounding issue? [closed]

I have a BLDC motor that rotates an imaging assembly(ultrasound) and alot of PWM noise can be seen in the resultant image produced. If I play around with the RX line that carries the imaging signal ...
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0answers
60 views

How to fix current leakage in a laptop at the mains? [closed]

See this previous question: current leakage in a laptop Kind of reopening this case, I expect that some fix at the power supply side would fix this, like connecting the neutral with the ground, OR ...
2
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4answers
248 views

What is an appropiate way to isolate a DC signal?

The question might sound kind of funny, but I'm unsure how else to word it. So... Pictures!! Currently, I have a setup like this: simulate this circuit – Schematic created using ...
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1answer
192 views

Oscilloscope ground and unit under test ground issue

I am working with an instrument which has a supply of 230V AC or 400V DC. AC source is isolated at the input via 1:1 transformer and DC source is a floating supply. I have a Yokogowa DL1620 ...
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2answers
733 views

“Ground” vs. “Earth” vs. common vs. negative terminal

This may just be me not having a degree in electrical engineering or electronics, but the whole notion of "ground" and "earth", when used in electrical circuit diagrams (especially integrated ...
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1answer
146 views

Understanding ground symbol

If ground is a reference point and it is not physically connected how can it protect someone touching the wire from electric shock (I probably misunderstand what that symbol really means)
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100 views

grounding 2 different power supplies

I have 2 circuit boards I'm trying to connect together that each have a common 24 VAC source they are connected to. The problem I have is I'm trying to feed a switching 12 VDC signal to the one board ...
2
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1answer
108 views

When an isolation transformer is not enough? [closed]

I work for a fairly large church and we have powered line array speakers that do not have attenuators in them. Over time a ground loop occurred from the stage lighting causing a very distracting ...
4
votes
1answer
252 views

Is the ground really the ground? [duplicate]

I've always been too embarrassed too ask, but the notion of "ground" has always puzzled me. The way I understand it, in theory, is that the earth acts as a giant sink/pool of electron and thus will ...
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3answers
220 views

How does a “break” in the neutral wire enable it to reach the full line voltage?

The answer to Is the neutral wire considered safe? states: When everything is working correctly, it should be at most a few volts from ground. However, and this is the big gotcha, if there is a ...
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69 views

Ground loops on single trace in the middle of a ground plane

I'm trying to optimize the layout of a MAX1979 TEC driver on a double sided PCB. Is the placement of single, small traces in the middle of a ground place, as seen below on the bottom side of the ...
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1answer
18 views

PCM4202 AGNDL/AGNDR connection

First, sorry if my english is not perfect. I have a question regarding AGNDL and AGNDR connectiof for PCM4202 . In the data sheet document ( figure 12, page 21) the decoupling caps are not connected ...