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.
1
vote
1answer
24 views
Choosing a ground for ltspice circuit
I am just getting into this software. I construct my circuit, and it tells me to choose a ground. I only have experience with "ideal" circuits and circuit elements, and have only seen "ground" in the ...
1
vote
2answers
89 views
Single wire systems need two wires; so how does ethernet over ground work?
It is possible to design networking systems that only use two wires: one for data and one for a common ground. Examples include 1-wire and Pin&Play. These are called single wire systems because ...
3
votes
2answers
81 views
Why are leads from the negative terminal considered grounds?
I'm using a 9V battery with a 5v regulator as a power supply. What I can't grasp is why I place the regulator in the (+) lead of the battery. If electricity is electrons flowing, and the excess ...
0
votes
1answer
75 views
Ground Fault Question Regarding a 3 Phase Circuit
I'm needing to design a 3 phase ground fault detection system for a 480V system. It will need to be able to trip when there's ground fault current >1A.
I have done some reading and it sounds like ...
4
votes
2answers
152 views
Do 2 5V DC wall warts in the same AC outlet have a common DC ground?
I'm trying to power a LED strand from one wart (5V), and my logic driver FPGA from another wart (also 5V). Both warts are plugged into the same outlet strip. I know I should probably power them from ...
3
votes
1answer
101 views
Power Plane and Decoupling Capacitors Routing
Forgive me for my simplicity. I'm just a hobbyist and not an engineer by trade.
I am trying to make my first 4 layer PCB in Eagle and I have a question I cannot find the answer to regarding power ...
0
votes
2answers
154 views
Transistors never work for me
TOday, I have built an LED cube. I put it all together, arduino, mess of wires and all, and it doesn't work. Fiddling with it a little bit, I find that if I short certain wires to ground, the LED's ...
1
vote
2answers
81 views
DC Voltage Grounded with AC Input
This is an image from a book showing us how to solve BJT circuits via AC analysis:
So I understand that when doing AC analysis to ground all the DC voltage sources but I don't understand why. Can ...
1
vote
1answer
91 views
Tying multiple power supply grounds
I'm planning on a home automation system, and two sub-sections will be separated by (say) 100 feet. These will be connected by a low-amp, low-voltage data connection. To avoid running significant ...
2
votes
3answers
146 views
Ground on Breadboard
I need to connect an input signal from a function generator to a circuit I made on a breadboard.
If I use a BNC to Banana cable, then would the "ground" of the function generator (the ground on the ...
3
votes
1answer
93 views
What's the use of ground coupling on digital oscilloscopes?
What's the practical use of ground coupling on modern DSOs? I know that it can be useful on analog oscilloscopes to adjust the ground exactly to a graticule line, but from what I've seen, most of the ...
0
votes
1answer
81 views
How do I wire a relay board into existing series recepticles
I have a four channel relay, that I'm going to attempt to wire into a terminal block. I have experience with mains wiring and some experience with electronics, but no experience wiring relays. ...
2
votes
2answers
145 views
bridge rectifier connected to a raspberry pi gpio
I'd like to connect a bridge (full wave) rectifier to my Raspberry Pi (RPi), GPIO pin 22 (configured as an input). I have configured the rectifier such that it has a 120VAC input and 3VDC output (I ...
4
votes
1answer
67 views
How do I connect a signal shield to minimise noise from close proximity AC
In my proposed application, I will have approximately 30 RS-485 nodes configured in 3 chains spaced ~1m apart. There is a need to pass through 240v L-N-E, +5v, A, B, GND in each node. The physical ...
0
votes
1answer
131 views
How does this heavily oxidized copper-to-steel joint work in earthing?
Wikipedia article on grounding features this photo:
Here's a close-up of the joint:
Clearly the steel rod is heavily oxidized and the copper wire is oxidized. The clamp is coated with something ...
