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0
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2answers
75 views

Not Understanding Grounding in an Electrical Circuit

This might be a stupid question but i am just a little confused about grounding/earthing. Specifically for example in a home when some electrical appliance faults, the current will go to ground since ...
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0answers
42 views

Odd Ground/Power(?) issue with Mixing Desk - alternate grounding?

I am a bit stumped with this one. Unfortunately there are a few variables involved, but I will do my best to ask an answerable question.... I just built a DIY synthesizer. It functions absolutely ...
1
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1answer
61 views

Can a ground fault be caused by something outside the home?

Yesterday afternoon, I had a GFCI switch trip. It would not reset. I figured I had a ground fault. I left the home for a few hours and after I returned I was able to successfully reset the GFCI. The ...
5
votes
1answer
102 views

Measuring soil resistivity and estimating soil equivalent resistance in a long distance

I'm trying to size the Neutral to Ground resistor (NGR) in the Wye of a 138 KV to 4160 V Delta-Wye Transformer. In order to find the proper value I have estimated the charging current of the system by ...
4
votes
1answer
83 views

Re-wiring experimental apparatus: Questions regarding proper ground, DC power supplies, and precision instrumentation

The apparatus consists of a large metal spherical chamber attached to a metal table. There are two electrical enclosures bolted to the table legs. The chamber is outfitted with multiple servomotors, ...
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1answer
299 views

Joining ground between ESP32 and LED Strip from single power supply

I'm driving an APA102 LED strip from an ESP32. Both are powered from a single 12V power supply that is brought down to 5V using a high-current (10A) buck converter. This works fine when I join the ...
0
votes
2answers
136 views

Balanced star 3ph system

I have balanced star three phase generator 380V with junction point is connected to ground And current through from junction point to ground is I0=0 for that clearly say it is balanced system when i ...
0
votes
1answer
49 views

Modifying power strip in enclosure to attach to power entry connector

We are using an off-the-shelf power strip to distribute power to several devices in a large aluminum, painted Hammond brand enclosure. We'd like to be able to switch the power on and off with an ...
0
votes
3answers
215 views

Floating power supply: voltage difference fixed but separate voltages not?

I have a +/- and GND power supply. The GND should be fixed to earth ground, and asking the supply for 5V gives \$\Delta v = v_+ - v_- = 5V\$. If I use a voltmeter against the positive and ground ...
1
vote
1answer
285 views

Ground Connection When Using AC Wall Wart Supply

I'm working on an audio project and was planning to power it off of a +/- 12V wall-wart power supply, of the type commonly used to power modular synthesis racks. I've noticed that these supplies only ...
11
votes
5answers
4k views

Automotive ground shift phenomenon

I'm working on the integration of a sensor into an automotive platform, using a standard 12v negative chassis setup. I am trying to understand a somewhat mythical phenomenon that is experienced known ...
2
votes
2answers
91 views

Could You Use Common cathode RGB LED without providing power to G and B

I know this kind of defeats the purpose of an (common cathode) RGB LED, but if you only wanted Red on a RGB LED would it be acceptable to use only the R pin and the Cathode pin to get just red? Sorry ...
0
votes
0answers
69 views

Right ground connection between different blocks

Which is the right way of ground connection? Is it necessary to separately connect grounds between different blocks, without touching other grounds? Something like ground PCB trace going through ...
1
vote
2answers
253 views

Grounding options between three PCB's

I have a PCB (let's call it PCB #1) that has a Li-ion battery as its power source, sourcing 12V to 17V. The power from the battery is used to step down to 6V using a buck converter on PCB #1. A cable ...
1
vote
2answers
113 views

Static Discharge on Metal Enclosure for Tablet causes restarts

The setup I currently have is a Aluminum enclosure for an Android Tablet. Inside the enclosure, a shielded USB cable is routed into the micro USB port and out through a small opening. This cable is ...
0
votes
2answers
115 views

unexpected power supply behavior

I am using this large 24V power brick (rated for 9.2A) to power a small circuit (an arduino controlling some RGB LED strip, drawing less than 0.5A). If I physically pull the plug out of the wall, the ...
0
votes
1answer
257 views

Shielding not connected to USB connector causes tablet restarts

I have a custom USB cable, USB type A male on one end and a DB-9 connector on the other end (only using 4 pins). The shielding of the cable is connected to the USB connector but not the DB-9 connector,...
0
votes
1answer
77 views

Hooking audio compressor to mains without chasis

I am nearing the completion of my DIY compressor project, and I have a rather seemingly basic question.. Once I hook up my toroid and everything, since I don't have my 19" 1U rack enclosure yet, but ...
1
vote
3answers
682 views

Child-Safe setup for ESD protection environment on desk

I need to setup an anti-static workbench in my spare office, and kids sometimes get into it ever since they learned how to pick the locks. My intended approach is to: Lay out an ESD mat on the desk....
1
vote
2answers
247 views

Can I use a double insulated power supply with a metal framed sculpture with LEDs

I have built a tree shaped wire framed sculpture with LED lighting. The LEDs each have a positive supply to the anode via an insulated wire and resistor, and the cathodes are connected directly to the ...
1
vote
1answer
62 views

Is it advisable to try to discover a place to make a ground connection on a board with a separate AC power supply?

I am building a device consisting of a microcontroller (an Arduino mini) attached to various output devices, which will be triggered using a wireless doorbell receiver. The receiver is a single board ...
13
votes
3answers
18k views

Grounding and why charge leakage occurs

A basic nugget of info is missing in my end-to-end picture of how grounding works and why it's important. When a voltage is applied in a circuit the electric current starts flowing (or the field ...
4
votes
2answers
3k views

Why the measured voltage increases when I change ground reference?

The following image shows my connections: The grounds of all devices are connected to a common PCB. When I measure the 1.2V referenced to the ground on my PCB, it reads 1.201V which is great. But ...
12
votes
4answers
5k views

Why would a power supply unit with insulating case and galvanic separation need a grounded power cord?

Recently I witnessed an external IBM laptor power supply that looked like a usual switched-mode power brick (rather small and lightweight for it more than 50 watts power) in plastic case but had a ...