Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [metal]

78 questions
8
votes
4 answers

Free Electron in Current

An electric current is a flow of free electrons. Are these free electrons totally free from the orbits of metal atom or they moving by jumping from one orbit to another orbit of the atoms? If they are totally free, what does enforce them to keep…
adba
  • 301
  • 1
  • 6
7
votes
2 answers

Why is there often a metal clip around a dc motor

I have seen many DC motors with a piece of sheet metal that is bent and snaps onto the motor casing. What is its purpose? Is it an additional cooling body? Or maybe to concentrate the magnetic field better? It covers the whole area where the…
Bruce
  • 1,051
  • 7
  • 17
5
votes
1 answer

Any simple short range metal detector?

I'm looking for a simple short range metal detector. I've looked everywhere and I can find only complex metal detectors circuits to find metal at several cms of distance, most over 60cm, they are an overkill for my purposes. What I want is a simple…
kR105
  • 317
  • 3
  • 14
5
votes
3 answers

Safest way to ground a metal enclosure

I am currently building a nixie clock with some high frequency components (GPS) and I am planning on putting the clock in a metal enclosure. The highest voltage used in the clock is approximately 510V (referenced to CLOCK GROUND). There are three…
hlove
  • 63
  • 5
4
votes
1 answer

Metal detector vs ground penetrating radar (GPR) frequencies

I was reading about metal detectors and at first got thinking they use lower frequencies because of ground/rock losses. Low frequencies will penetrate better, but seeing GPRs penetrating much deeper and using much higher frequencies got me wondering…
Ron Vaisman
  • 804
  • 7
  • 13
4
votes
2 answers

What is more conductive, copper or doped silicon?

At room temperature, which is more conductive: copper, N-type silicon, or P-type silicon? What are their respective conductivities?
gstudent
  • 107
  • 1
  • 4
3
votes
1 answer

What is wrong with this soldering iron?

It's body is blackened, just after 5 minutes of heating and it's body is also bent. How can I solder when the iron itself works so poorly? P.S: I am using it for the first time.
supreet shetty
  • 31
  • 3
3
votes
1 answer

How are metal leads on through hole parts made?

For example, consider a TO-92 packaged part: How is one of its leads manufactured? Can they be customized?
Conor Patrick
  • 317
  • 3
  • 14
3
votes
1 answer

What are USB Connectors made of?

What type of metal are the tips of USB connectors/plugs typically made from? Aluminium? I've noticed they will often, quite-easily, oxidise/rust/corrode.
voices
  • 1,039
  • 1
  • 15
  • 29
3
votes
2 answers

Parameters of a metal detector coil

I built metal detector called MiniPulse Plus (it is a kit. comes with calibration instructions but says nothing about the coil, except that it should be between 300-500uH). A circuit sends a pulse into the coil (58uS width, at 1KHz), it waits for…
Gabriel
  • 793
  • 2
  • 14
  • 33
2
votes
1 answer

Why do dielectric waveguides support hybrid modes and metallic waveguides do not?

Can anyone explain to me qualitatively why dielectric waveguides (core and infinite cladding) support hybrid modes (E_z and H_z components in the guided wave), while metallic waveguides cannot? I am sure it is about the boundary conditions but I…
Minas Michael Opethian
  • 33
  • 2
2
votes
0 answers

What metal(s) are old game console RF shields made of and coated with?

I'm restoring my old game consoles (like NES) and am having trouble finding what the RF shields are made out of and coated with so I can sand out the corrosion and re-plate them. I thought it might be steel sheet metal plated with Zinc and chromate…
liquidRock
  • 121
  • 2
2
votes
0 answers

Troubleshooting component failures in a metal box (that's next to an air band radio transmitter)?

I have a little project that's been experiencing component failures, and I'm having trouble figuring out what to do about it. I think the issue is ESD but that's just a guess. Also I'm a total noob so, whatever's happening, the root cause is…
danavee
  • 135
  • 6
2
votes
4 answers

How can I drive an LC tank circuit to get a nice and clean sine wave?

As advised by Andy in this post, I constructed single loop transmit and receive coils: I use this circuit to transmit a powerful field: The Tx signal has a large spike that is reflected in the Rx signal, too: How can I drive the Tx tank circuit…
maijaz99
  • 33
  • 5
2
votes
0 answers

Another ground question...plastic case with metal front panel, ethernet, connectors

I'm currently designing a board that will have: a primary power supply of 24VDC from an external converter a shielded Ethernet connector two BNC connectors (for two +/-10V signal, 14 bits, <100Hz) The housing is in full plastic (screw headers…
aurelienr
  • 21
  • 1
1
2 3 4 5 6