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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699 views

Using Oscilloscope So That Nothing Blows Up

I want to see the input current waveform of an LED T8 18W. An EM ballast is purposely placed in series with the lamp. I don't have a power analyzer. What's available is a GDS-2102 oscilloscope. So I ...
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1answer
93 views

Does 3.3v ground and 5v ground connected will affects circuit?

I have a wifi transciever(ESP8266) which should be connected to 3.3v and microcontroller connected to 5v(PIC16). For establishing the communication between the microcontroller and wifi they should ...
3
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1answer
103 views

Why is AC earth connected to DC ground in laptop adapters?

If I were to plug this type of adapter into an ungrounded socket then voltage will leak to the DC ground through the AC filter capacitors. So why is the DC side not left floating? What are the ...
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2answers
42 views

How do I connect the virtual ground as shown below

This is a circuit for EEG. How do I make the connections labelled as Virtual Ground? Also, how do I connect the 1M trim pot in the top right?
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1answer
29 views

Designing a Circuit with Virtual Ground

I'm designing a power/charging circuit and I'm stuck on a little issue. The circuit is going to have 2 rechargeable 3.7V Lithium Ion batteries to power a separate circuit that requires 3.3 V to run. ...
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2answers
48 views

Outlet grounding confusion

I don't have much AC knowledge, but I am willing to learn. I've been surfing the web to find out more about outlet grounding. I still want to know more, that is why I am asking this here. Grounding ...
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1answer
48 views

Ground isolation

I am looking at ways to isolate my board and supply ground. I am feeding my board with a 40V dc power source. Now, the ground return of my board should not be connected to the battery return is the ...
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0answers
55 views

How is the ground symbol in this circuit connected?

I stumbled upon this circuit the other day and there is something that I can't quite understand: As I understand, in the schematics one side of this parasitic capacitance is connected to the output ...
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7answers
1k views

Does ground suffer from a voltage drop like effect?

I am currently working on a project where I need some very long wires (about 20 meters, and that is 40 meters both ways), that will be connected to a button which will be used to trigger a pin on the ...
4
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1answer
56 views

Distributing Ground and Clock Between ADC and FPGA on Separate PCBs

This question is in reference to my previous question where some suggestions were made that went somewhat off-topic. Basically I have a built a system with an FPGA and very sensitive ADC (sensitive ...
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4answers
72 views

Neutral vs ground wire? [duplicate]

I have a simple question about neutral and ground wire. Since the neutral is connected to the ground, I have problems understanding the difference. Assuming it is connected to the ground, it should ...
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1answer
42 views

Invert ground vs. open “signal” - relay?

first post here. I'm trying to design a circuit to invert a ground/open input signal. I.e., output is grounded when the input is open, and vice versa. I have a feeling this can be accomplished with ...
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2answers
78 views

Few questions about basic concepts in electronics

So I'm rather new to electronics and I'm struggling to understand some basic concepts because I picked up little information from many different sources so it's starting to get confusing :/ Why does ...
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3answers
82 views

Confusion around common mode voltage

I understand the basics behind the concept of common mode voltage and CMRR and friends, in the context of differential amplification. What I don't understand is the determining if the whole concept ...
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2answers
225 views

sharing ground for serial connection Across raspberry Pi and Arduino both with different power supply

I do power the Raspberry via a 5V USB charger. The Arduino is soldered into a different circuit and is powered from a 24 V circuit via a 5V charge regulator. Both will be connected to the same 230 V ...
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1answer
83 views

Can I connect multiple brushless motors and ESC's to a single GND in Arduino Uno?

The main aim is to connect 4 motors in parallel each with separate ESC's to a single GND. I want to do this because there is a limited number of GND sockets built in the Arduino microcontroller. I ...
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0answers
29 views

Switching Ground to Switch Input

I have a bluetooth headphone set that I purchased recently, and I'd like to install a 3.5mm female port so that I can switch from bluetooth to wired input at will. My understanding is that no power ...
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0answers
86 views

Microcontroller VDD and GND pin short circuited. What is the problem? Is my controller damaged?

I am using ADC of stm32f407 board to read data from potential transformer, the primary of which is connected to AC mains 230V. Its secondary voltage is 12V and and after which i have connected a ...
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2answers
83 views

Ground Connection for circuit. [on hold]

Here i am trying to light a single LED using a 1.5V battery. Forget About LED voltage rating. What i need here is , where will my ground connection go? what is the significance of that ground and ...
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3answers
60 views

Will Cutting the Data Lines of USB Still let power to go through?

A USB 2.0 Cable should have 4 cables. They are the Vcc, Data+, Data- and Ground. If I only cut the Data Wires and let the Vcc and Ground wires connected. Will it still be able to transfer power or ...
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3answers
46 views

Can I ground the negative DC bus of a variable frequency drive?

Suppose I have a typical VFD: rectifier, DC bus caps, inverter, feeding a motor. In general it would not be advisable to tie the DC bus to earth ground, because the AC line may also be referenced to ...
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3answers
91 views

What is the difference between Ground and Low?

What is the basic difference between sending a LOW signal vs GND to a circuit? What If I ground instead of sending LOW? Or similarly what is the difference between Vcc and HIGH?
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2answers
477 views

How many ground and power pins to have in a connector?

I'm designing a daughter board for a project. There are 35 I/O pins that need to go to the board. How do I determine the number of ground and power pins to include? How do I determine the placement of ...
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0answers
32 views

How to check the grounding of rack shelf for ESD

Can anyone suggest how to check the grounding of the Metal Rack Shelf for Discharging Static Electricity? I have an Earth tester with three terminals. Is it possible to conduct the test by using ...
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5answers
119 views

Dual polarity (\$\pm15\$V) from a bench power supply with only one output

I have a GW Instek bench DC power supply (0V-30V, 0A-3A~5A). The output terminals are labeled as -, GND and +. The GND terminal is physical ground because it has continuity with the power supply's ...
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2answers
106 views

Extra spacing between some traces and the ground plane

I have seen several designs where there is extra spacing between some traces and the ground plane. For example, see the traces between the points A and B or C and D in the following picture (this is a ...
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4answers
872 views

Why do multimeters have an aluminium foil at the back?

I was wondering what is the purpose of aluminium foil at the back of some multimeters? I did a continuity test and found that it is connected to the ground (COM) terminal. My initial guess was that ...
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2answers
53 views

Connecting Analog GND and Digital GND of ADC

I'm trying to make a simple line tracing robot, however I couldn't figure out how to connect AGND and DGND of A/D converter(MCP3208) on a simple perfboard design. I need some guidance how to smooth ...
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6answers
237 views

positive vs negative, power vs ground, flow direction

I'm getting very confused about the inconsistency where some people say ground is always negative, and some say ground is always positive. And some would say, electrons travel from the power source ...
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1answer
115 views

How can one use the earth as a second wire?

I read recently that the earth can be used as a wire to save wiring costs. My understanding of how this works is that a power source, say a battery, separates charge, creating electrons on one side ...
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0answers
44 views

Chassis ground and circuit ground connection

I am understanding the concept of the chassis ground vis-à-vis a DB9 connector to my pcb. Now, the db9 has a silver encasing which is connected to 2 or 4 pins which can be connected to the chassis ...
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1answer
40 views

Extra 2 DB9 pins connection

Many DB9 symbols have 2 additional pins other than the 9 signal and GND pins that they are known for. How and to what are these 2 pins connected ? Pins 10 and 11. Is it connected to chassis ground ...
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0answers
40 views

common mode choke orientation

My doubt is pertaining to the polarity of the common mode choke or ratehr the direction of the common mode current in a board I am designing. I have a battery which supplies the Vcc and Gnd through ...
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4answers
72 views

analogue and digital ground connection

I have been reading up on grounding and what is AGND and DGND i.e / analogue ground and digital ground respectively. Suppose , I have an ADC chip and a MCU in a PCB. Now, previously I would have a ...
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1answer
39 views

chassis ground and its location wrt common mode currents

This is related to chassis ground. The chassis ground is connected to the system ground at the entrance of the cable that brings in signals and not at the other extreme or opposite end of the PCB. ...
0
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1answer
44 views

common mode ground and its connection to main ground

I am trying to understand concepts in common mode voltage and EMI due to it. Now, I understand that differential mode is the difference between the P and N wires/signals. The common mode is the - ...
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2answers
53 views

Buck regulator frequency

I am trying to use a buck regulator. Usually I make it use at its Max frequency and then just use it. But now, we want to go for Emi and emc certification. I am hence told that this switching (a few ...
0
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1answer
21 views

Ground properties viz power and digital

What is the difference between power ground and digital ground ? What I understand is that the pgnd is the path through which the supply current discharges. Now the DGND, is the ground reference to ...
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1answer
52 views

Positive Part of a stereo jack?

Ok, so I'm building a bass/treble cut switch for a guitar pedal and on the diagram that I'm following it shows an output switch with a + label on it. Which part of the jack is that ? Also, where is ...
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1answer
83 views

grounding issues in a PCB

I am trying to design a grounding plan for an RF transciever system. I dont want to go into the component and part details. The basic system is as shown below simulate this circuit – ...
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3answers
192 views

How do I know when an amp has virtual ground?

Well, I´m making "Cmoy amp" (Actually RA1 copy), but I've been stuck in the power management since I saw these: Here the blogger says that the amp uses a real ground circuit. (And there's also a ...
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1answer
42 views

Should cable shield connect to ground plane on hand-held tethered device?

I am designing a hand-held device whose power and signals come from a cable. The device circuit will be +5 volt and powered through the cable. The cable (a re-purposed HDMI cable) has multiple ...
4
votes
1answer
68 views

common mode ground

My doubt pertains to a certain document/app note about common mode and differential grounds- Link1 and Link2. What I read about common mode noise is that it is a noise generated on all signal lines ...
2
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5answers
150 views

Is it a good idea to connect the Neutral point to your common ground in your PCB?

I am making a PCB that uses AC Mains power where 120VAC is converted to 5VDC with the help of AC/DC converter. The 5V output is then supplied to my digital circuitry. The main confusion I have is to ...
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2answers
93 views

Ground in an Active Circuit

I've been asked to build this active notch filter circuit for my electronics class : but I don't understand, where does ground go ? Could someone show me the same circuit with the ground drawn in ? ...
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2answers
61 views

Reverse of referencing everything from ground

Say we live in a world where p-type carriers just have more mobility and therefore switches faster than n-types, so we'll favour PNP's and PMOS's. So in such circuits, we reference everything from the ...
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2answers
307 views

What is the zero-sequence equivalent of a YNy0 transformer?

The zero sequence equivalent network of a YNy0 transformer with grounded primary is shown below (source). It looks like there is no connection between the primary and secondary side of the ...
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4answers
439 views

For Multiple ADC circuits PCB layout grounding, why is “single point ground” important?

I am reading this article from Maxim on mixed-signal circuits grounding: https://www.maximintegrated.com/en/app-notes/index.mvp/id/5450 Everything makes sense to me until I read the "Grounding ...
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2answers
60 views

Matching ground references between computer and small DIY amplifier

I am teaching myself about audio amplifiers and put together a basic circuit to receive the signal from my laptop and then drive a pair of 32 ohm headphones. The small amplifier is powered by the USB ...
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0answers
65 views

Full wave bridge rectifier min volt is not zero in multisim oscilloscope

I used Multisim for a Full-Wave bridge rectifier, using 1N4007 diodes and 1K R-load. The problem is the Min voltages its not Zero, but goes as high as 3V. But when I used RMS voltage source instead ...