Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [interference]

For questions about electromagnetic interference (EMI); see also the [emc] tag.

Electromagnetic interference (EMI), disturbance that affects an electrical circuit due to either electromagnetic induction or electromagnetic radiation emitted from an external source. See

380 questions
18
votes
1 answer

Unusual interference

I'm experiencing an effect somewhat like GSM frame-rate audio break-through in my audio systems - completely different frequencies but equally wideband. I've noticed it occasionally in the past - always at this precise time of year. The sound is…
Russell McMahon
  • 150,303
  • 18
  • 213
  • 391
17
votes
13 answers

Is it possible that the phases of the moon could have an effect on the operation of certain types of electronics?

What type, what could the potential effects be, and why would this happen? EDIT: Yes, I am talking about physics not the supernatural. I figured this would be obvious unless people thought I was joking around, the tides are effected I know that much…
MetaGuru
  • 293
  • 2
  • 7
2
votes
1 answer

Treadmill charges electrostatically, creating interferences with my PC

I have been using a treadmill for around 10 months, then it started causing my PC to detect connection and disconnection of my keyboard. It took me a while to realise that the treadmill was the source of the problem. At first it was creating these…
Norcino
  • 121
  • 4
1
vote
1 answer

Can ferrite beads deal with electromagnetic interference on attached PC peripherals?

This questions is more related to computer + external electromagnetic interference with my PC. I'm using a PC where one USB 3.2 Gen2 port is occupied with a USB 3.0 USB hub. I'm facing problem with specifically the USB sound-card connected to the…
15 Volts
  • 486
  • 4
  • 13
1
vote
2 answers

MAX 485 performance

I wanted to test the performance of MAX485 drivers. I set up one driver and one receiver 2-3 meters apart. A 100 Hz square wave was being sent down the line. Roughly in the middle of the cable I put a high voltage coil (similar to ones found in…
Blaž Umek
  • 93
  • 6
1
vote
1 answer

How to model this scenario/circuit with 50Hz interference?

There is an industrial amplifier for force transducers. It amplifies strain gauge outputs and outputs voltage. Lets call this as a voltage source Vtrans. Its output is around 50 Ohm. I measure it with a data-acquisition board as follows: The max…
floppy380
  • 1,845
  • 7
  • 38
  • 74
1
vote
1 answer

Electromagnetic interference to my project

I am working on a project for couple of months and eventually it gets completed and worked perfectly on the test bench. But the issues arise when I installed the system. Let me show you some pictures of my project, The controller part The LCD and…
Siddhartha Sadhukhan
  • 199
  • 1
  • 1
  • 10
1
vote
1 answer

Credit Card Swipe Interference

I am asking a question as a part of library maintenance for electrical equipment. We have installed a POS machine with credit card swipe on the same outlet as a laser scanner (used to check in books). Apparently, the POS gets a signal immediately…
Maribel Cabrera Ibrahim
  • 11
  • 2
0
votes
1 answer

Desktop screen goes black because of radiowaves from phone?

I hope this is the right community for this phenomenon. For some weeks my desktop screen went black for some seconds - no warning prompt no nothing - and then came back to life. I usually change my phone directly below the monitor. Today, the…
breathe_in_breathe_out
  • 103
  • 1
0
votes
2 answers

How exactly do inground electric dog fences work? I need help making a square perimeter with one side that dose not trigger the collar

I need help laying out an in ground electric dog fence in a square formation with one side of the square not triggering the collar. The issue it that the manufacture says that inorder to do that we need to make a double loop in which the wires are 5…
Robert Barnett
  • 19
  • 2
0
votes
1 answer

PMR446 interferes with small electronics?

Some small electronic devices react to PMR446 adversely temporarily, when exposed to a PMR446 transmitter, during the transmission. Portable DVD player: Green horizontal stripes on screen. Increasing if I hold the PMR446 transmitter near. Portable…
neverMind9
  • 742
  • 1
  • 7
  • 22
0
votes
2 answers

Why is 50/60Hz interference is also called RFI interference?

I encounter sayings like this everywhere: RFI interference is unintentional radiation from sources such as electric power transmission lines. My confusion comes from my following thinking: 1-) First of all, power transmission lines work with…
floppy380
  • 1,845
  • 7
  • 38
  • 74
-7
votes
1 answer

Jamming Devices

Im am thinking about building a low power broadband jamming device to blanket a small area, around 400 sq.ft. I want my frequency range to be from DC to 100 ghz. Would amplifying the outputs of noise diodes that are summed to produce this broad a…
Fred Paine
  • 55
  • 1
  • 2