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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Sharing negative terminal (“ground”) between 2 LiPo batteries and UBECs / paralleling 2S LiPo packs

One of my projects require a hefty amount of amperage - and as such I want to use 2 LiPo 2S batteries, in parallel. In addition, I am regulating the voltage using multiple DC-DC step down converters ...
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125 views

Operational Amplifier Virtual ground

I know that an op-amp tries to hold the input voltages the same. So, for virtual ground we can connect + node to the ground and we're getting a 0V on the ...
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4answers
138 views

Significance of GND in bridge rectifier

simulate this circuit – Schematic created using CircuitLab In my book, this diagram is used to explain how a bridge rectifier works, in positive and negative half cycles. But it does not ...
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52 views

Leakage from MOSFET Switch To Ground

I built this circuit at home to for science (I explicitly drew the body diodes for clarity). simulate this circuit – Schematic created using CircuitLab Imagine the following scenario: ...
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34 views

Use Earth and Ground Rods as Tip and Ring for a Modem

My co-worker and I recently tested this theory out with two Cermetek 1794A modems. Datasheet: http://www.cermetek.com/Catalog/High-Speed-Modems/DataSheet/CH1794A_607-0020.pdf Now first, we did two ...
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62 views

Does signal ground have to be connected to actual ground?

Does signal ground have to be connected to actual ground, or does it simply need to be a common node? I have a number of "floating grounds" in my schematic (denoted by the upside-down triangle) and ...
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3answers
97 views

What do we mean by “ground” in an electrical circuit? [duplicate]

What do we mean by ground in an electrical circuit? When we want to solve electrical circuits problems, we set a "ground" level which is mean that the potential on it equal to $0$. I wonder how the ...
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34 views

RF Ground (Reflections?)

I'm trying to understand how someone can ground an RF signal (especially relating to microstrip lines). I think I'm missing something... Since the impedance of ground is supposed to be \$0\Omega\$, ...
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72 views

Constant current led drivers shared ground

I have 4 constant current led drivers with PWM. Here's 300-1500mA LED Driver datasheet. I want to use 3 of these drivers to power each color of a 90w rgb led. I was under assumption that I could ...
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1answer
89 views

Shorted antenna DC-blocking capacitor value

I have an antenna that contains a DC short to ground ( a PIFA antenna at 1575 MHz in this case ). However, my device cannot tolerate a DC short to ground, so I need to include a blocking capacitor in ...
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5answers
728 views

Where is the Ground in a Simple Electronic Circuit [duplicate]

I am rather new to electronics, and I am reading up on the topic. I came across the term ground. I get the large scale applications like the wires leading into the ground from power lines, but how is ...
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248 views

Making a grounded object capacitive

I am trying to make a copper pipe which is placed in a natural park capacitive. It is placed in the soil meaning that it is already grounded. I am using a basic arduino and their capacitive sensing ...
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123 views

Tying ground planes together with a non-zero Resistor

I was reviewing the schematic of a motor driver board and noticed that the digital and analog grounds are tied together with a 3.9 ohm 1/4 watt resistor. I am still trying to find the gerber files to ...
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0answers
29 views

SPDT Switch in Logisim

How do I implement an SPDT switch in Logisim? I need it for connecting 2 pins to ground but not at the same time.
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2answers
70 views

Charging lead acid (car) batteries with a common ground

I have three identical lead acid batteries. All three batteries are on a common ground since they power different components on a same circuit. I have three independent "intelligent" chargers whose ...
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77 views

Ufer ground in home foundations — NEC code / copper conductors [closed]

Here's the relevant NEC code (2014) for the question I have: NFPA 70 250.52 Grounding Electrodes. (3) Concrete-Encased Electrode. A concrete-encased electrode shall consist of at least 6.0 m (20 ...
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2answers
88 views

Grounded thermocouple vs “grounded” thermocouple

I'm having problems with documentation and what appears to be conflicting use of the word grounded. The way I understand it, a thermocouple can be [grounded, ungrounded, or unsheathed] ...
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3answers
125 views

What if I have a voltage between ground neutral? [duplicate]

What does it mean when there is voltage between ground and neutral (220V) and between phase and neutral (220V) but no voltage between phase and ground (0V)? What could happen? Is it safe? Is it ...
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26 views

Floating EEPROM (28c64A) pins an option?

I am building an eeprom programmer for the 28C64A (dip package) with my old basic stamp ii "homework" board (lost my arduino in the move). I have the first four address and data pins, as well as W E ...
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41 views

Using Ground Off Another Circuit [closed]

I have a power outlet without a ground, but I have an electronic device which requires a real ground (can't use a GFCI protected outlet). Would it be okay to run an extension cable from an outlet ...
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1answer
47 views

Connecting two RF devices

I plan to build two RF modules. One is an analog down converter with a balanced output IF of ~50 MHz The second in a fast ADC @ 100 MSPS with balanced input. I want to have them separated for ...
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2answers
116 views

Finding ground in a battery powered circuit?

I don't know if this is an obvious question. I'm powering my circuit (that's used to amplify an EKG signal) by a ±5V battery supply, the amplifier I'm using the ina129 needs a voltage reference ...
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2answers
85 views

Connecting a 10V variable source across a load (without ground) [closed]

I have a problem. I am a second year Electrical Engineering student. But the problem I experienced is from first level electronics (for which I could not find a solution). I have been recently ...
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62 views

RS232 Grounding question

I want to connect 2 devices together using RS232. I initially thought both devices used the power ground as the reference signal for their RS232 (they're powered by the same PSU) so I designed my ...
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1answer
73 views

Ground noise measured on scope

I've connected a scope probe directly to the ground clip of the scope. I then observe the signal on the scope and it's reading 0, as expected. I set my trigger to be 1V above the 0V reading it ...
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70 views

Problems in shifting the ground of a power supply

In order to measure the low noise of a device at a negative voltage between -5V and -1V, I developed the following circuit: Transimpedance amplifier using OPA656U from Texas instruments that ...
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2answers
85 views

Why does power go both to and from a power station?

It is common practice that wires in power lines send power both to and from a power station. Suppose that, instead of forming a closed circuit between a substation and a consumer, both the substation ...
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46 views

RS485 + Power over twisted pairs, still need isolation?

I need to communicate with a piece of hardware on an elevator car. I have a few twisted copper pairs available, but it's not CAT5, so Ethernet is out. Instead I'd like to use RS485. I've been ...
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2answers
63 views

Two chip antennas, same ground plane?

I would like to use a 430mhz RF antenna and a 1575mhz GPS antenna. Both antennas are chip and drive current in the ground plane to radiate. The RF antenna is only useful 1s every minute. The GPS has ...
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2answers
118 views

Common ground : Computer A and USB powered Arduino ( MCU ) from Computer B

I have 1 computer, 1 laptop and usb powered arduino ( MCU ). Arduino is connected to laptop via USB cable. Laptop is connected to 220V wall or runs from batteries. One PIN from arduino is connected ...
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107 views

How can I pump 1000 watts in the ground

I have heard of using the ground for communication with extremely low frequency waves. They said 100 watts gives you a km and 1000 watts gives you 10 km. How can I go about pumping the waves into the ...
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4answers
95 views

Pull up circuit current flows?

Im trying to understand how pull up/down circuits works . Let's consider this schematic : I understand that there are two possible current flows : When the button is not pressed, the current ...
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0answers
100 views

3 pin power adapter: 24V, GRN and COM

I'm trying to make a replacement power adapter (24V---3.75A) for a medical monitor. There are 3 pin connectors and the diagram on one side of the supply box reads: 1- 24V, 2- GRN and 3-COM. I ...
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1answer
144 views

How to safely use the power-socket ground for the anti static wrist strap?

I saw as practice to use the power-socket ground for the anti static wrist strap, I saw this done where there is no available specially designed ground for anti-static pads and bracelets, but this may ...
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2answers
171 views

Can I use ferrites for the ground connections?

I may have an issue with conducted EMI through the ground connections between devices in a system. There is specifically a device which clearly creates noise on the measured signal from another ...
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1answer
295 views

Why my DAC works without GND and VCC?

This is the most interesting thing I have seen! I have built a DDS that sends data (D0-D7) to a DAC (ADV2175). The design worked fine and I just have a low frequency alias noise (a question here). ...
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1answer
85 views

Which configurations are safe to use an oscilloscope?

A USB device is connected to a Laptop PC. Laptop PC has a ground earthed power supply. Oscilloscope's negative lead is connected to ground via its own power supply. Oscilloscope's negative lead ...
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120 views

Controlling an RC car

I 'm planning on controlling an RC car via ΒeagleBoard-xM. Pistol transmitter uses ic TX2 encoder. As image shows, right-left commands are implemented by a 3-part conductive area. Specifically, when ...
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3answers
132 views

Nodal analysis with two voltage sources

EDIT: I am not removing the linked question and redoing the question. How do you formulate an equation on a node with two voltage sources connected in it, regardless if it is a supernode or not? ...
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2answers
86 views

Okay to have both negative and positive grounded equipment at same site(location)?

We have a radio comms site with multiple equipment. Originally the site was set up with a positive ground at the rectifiers. We have some new equipment that is powered from the rectifier shelf, that ...
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51 views

Controlled sources in Tina-TI

I am using Tina 9 to verify whether my answers in mesh analysis and nodal analysis are correct. Just started using it, and I have some queries about controlled sources. On simulating control sources, ...
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222 views

Why connect two power supply grounds?

I'm reading a tutorial and it is showing how to control a DC motor with Arduino board's micro controller. A DC motor is fed by a 9V battery and a transistor is controlling the PWM as in the figure I ...
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2answers
227 views

Why is chassis connected to earth ground but not neutral?

My question arose from my previous questions. Here depicts how electricity is distributed to houses:http://www.epanorama.net/documents/groundloop/feed_1phase.gif It seems like the earth ground and ...
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1answer
127 views

How to achieve common ground for a single ended input?

I'm using a current loop transducer as in the set up picture I provided. The transmitter is regulating the current proportional to a physical quantity and regulating the current. It is a typical 4 ...
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1answer
89 views

How to ground pins on a multilayer board with a ground plane?

Let's say I have a multilayer board with a single dedicated ground plane. Should I place all the grounds directly to the plane with a via as close as possible to the pin/pad or should I be looking ...
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2answers
91 views

Eagle ground plane polygon

I have been struggling to get the ground plane to fill in Eagle. Basically I have a very simple schematic, it is just VCC, two LEDs and GND. Now I went into Eagle, selected draw polygon and drew ...
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1answer
328 views

What is mecca ground?

I came across few different ground names (digital, analog, signal, power, mecca, EM, shield, etc). I do understand most of them - but mecca is a new one for me. Can someone please explain me this ...
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299 views

Use battery negative as ground

Powering an arduino board using batteries via the the barrel connector, is it ok to use the negative terminal as ground wherever its needed? For example, I have a shield that takes +5 and Ground from ...
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110 views

Getting +/- voltage from a benchtop power supply

I have this benchtop PSU which I got from some dude on Craigslist: I need to power a circuit that requires +12v, -12v, and a ground reference. Currently the way I do it is to use one channel of the ...
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106 views

Is grounding needed when using adapter to phone?

I am doing research on an audio plug. I wonder, is it a must to connect grounding circuit from handphone to the earphone if we use an adapter (image 1). Or can I do the connection like in image 2? ...