Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [copper]

The Element Cu known for its electrical and thermal conductivity, both of which are exploited in EE. THis material is typically what is used in PCB's for the traces and also modern CMOS processes have Cu layers in them due to it's superior conductivity. You also see copper in heat sinks to carry heat away from components.

0
votes
0answers
44 views

Power problems related to copper wires and pigtails

I am using a battery to power a odroid which requires 5V/4A. The battery voltage when measured using a multimeter was around 26.7. I had two setups: I used a 1 sq mm copper current carrying wire to ...
1
vote
2answers
56 views

Tank Water Level Indicator Wire

I am building a simple water level indicator (approx like the circuit below) for my tank. However, I am wondering about the wiring, for I suppose copper cables corrode in water and produce toxic ...
2
votes
1answer
127 views

Can Silkscreen Go Directly Onto Copper PCB Layer? (No SolderMask)

Hi I am wondering if a PCB silkscreen layer can be printed directly onto a copper layer without a solder mask. I don't see this often but I have a design for which this would be useful. Has anyone ...
3
votes
2answers
122 views

PCB grounding through screw head

Can we use zinc plated screws for PCB grounding? Means the zinc coated screw head will be in contact with copper trace on PCB for grounding. But this can cause galvanic corrosion between zinc and ...
0
votes
2answers
142 views

DIY electromagnet using copper wire and AC adapter

I want to make for some demonstration (caching some paper clips on ON and doping them on OFF) electromagnet made from copper wire (should it be single wire?) with ferromagnetic inside coil: As power ...
0
votes
1answer
74 views

Why does having magnetic material in the middle of a stator help generate a current?

It seems unintuitive to me why putting a stationary hunk or iron or neodynium in the middle of a copper coil generator would increase its conductivity, because the metal could act as its own ...
0
votes
1answer
141 views

How To Hide The Outline of The Polygon in Altium

I have copied a polygon pour from one PCB to another, but I cannot seem to hide the outline on the new board. Anyone know how to do this? Comparison below: New Board: Previous:
0
votes
3answers
583 views

How do I calculate the resistance of a copper bar?

I'm trying to calculate the resistance of a copper bar in a DC current, but I'm not sure how to do it. The only things I've seen online calculate the resistance of a wire and ask for its gauge, but a ...
0
votes
1answer
233 views

2D DIY capacitive panel

I'm planning on replacing lights with smart bulbs (e.g. Yeelight RGBW) and replacing light switches with capacitive panels connected to Arduinos which will send data to RPi, which will then control ...
0
votes
1answer
322 views

What is the best metal to use for lead acid battery cables?

I purchased an AGM lead acid deep cycle battery, inverter and solar panels. All of the provided cables connecting these devices were made of thick copper. I also have Goal Zero Yeti 400 lead acid ...
0
votes
1answer
61 views

Magnetic field of a 25 micron thin wound up copper ribbon?

What are the magnetic properties of a 25 by 10000 micron insulated copper ribbon that was wound into a dense spiral? It wouldn't be practical because of overheating? Theoretically, graphene has the ...
0
votes
1answer
297 views

PCB layer copper thickness calculation

In a 4 layer PCB, the outer layers 1 and 4 have 1 oz copper thickness and inner layers 2 and 3 have 0.5 oz copper thickness. For example, if I allocate a VCC voltage to 3rd and 4th layer, can I say ...
0
votes
1answer
84 views

Unifilar (non-stranded) copper wires flexibilty

we all know the 26 AWG wires that come inside UTP cables. Those surely are flexible. But what a bout an AWG 15-16 such copper wire, is it flexible enough to use as feeding cable for the 12 V car ...
0
votes
3answers
490 views

measuring resistivity of copper wire

I have a power supply, multimeter, and a copper wire with cross sectional area (A) A= 2.14*10^-3 m^2, Length L = 0.13 m and the resistivity of copper is p=1.7 × 10-8. The goal is to find the ...
-3
votes
2answers
291 views

What size of copper conductor can act as a 50A fuse?

If I would like to use a piece of copper conductor as a 50A fuse, what size of conductor should I use? What is your advice for dimension? It doesn't have to be 50A very accurately, the parameters I ...
0
votes
1answer
150 views

Copper overlapping via and when to use thermal relief (Eagle PCB Design)

I have created a copper track which runs around the signal pin from an SMA connector (as shown in the image). The problem I seem to encounter now is that from the polygon fill, the copper pour ...
0
votes
1answer
313 views

Exposed copper on PCB

I tried to separate soldering on a Raspberry Pi but exposed some copper. The Raspberry Pi boots just fine. Is this safe?
1
vote
3answers
300 views

Altium pads and holes print PDF

I'm trying to print a PDF to put my PCB design on copper, and I get the PDF document and everything seems to be alright but when I print my design the pads are filled in black. PDF Output And this ...
-2
votes
1answer
92 views

Copper standard used for PCB manufacturing

Could someone help me with information associated to the type of copper standard which is used for PCBs (single layer & multiple layers)? And if possible share datasheets if available. Thank you ...
0
votes
2answers
284 views

Can I use copper tape to connect Live AC power?

I want to fit a light on a wall in my flat, but there's no way of getting power cables discretely to it (I can't get to it from behind the wall, and the wall's not thick enough for me to embed a cable)...
0
votes
3answers
934 views

Slayer Exciter : Aiming for Larger Arcs

I was recently building a larger slayer exciter. I've been trying out different coil ratios, coil materials, different transistors and many circuit variation, most of them just excited a fluoroscent ...
-2
votes
1answer
173 views

Creating EMP emittor, is this capacitor good?

I'm creating an EMP and i was wondering what the discharge on this capacitor is: 1 x Castle Cap Pack (50v, 12s LiPo, 880 Farads) -Its used for helicopters and airplanes so surely this would be good ...
0
votes
0answers
360 views

How to do Calculations for a heating pad?

I am designing a fabric heater using copper wire for initial calculations. I need to find the power required to achieve a temperature difference of 40 degree Celsius & ambient temperature is 20 ...
0
votes
0answers
391 views

How to turn a ribbon cable into copper wire

I am 12 years old and build lasers and invent many things, but I ran into a problem. While building a laser I realized that the diode I had got from an old DVD player, got it's power supply from a ...
0
votes
2answers
53 views

General Steps (guidelines, formulas and matices) in selecting wire-gauge for copper wires, when knowing the load characteristics?

I would like to ask if someone could summarize the steps/process we follow in order to select an appropriate diameter of copper wiring for an application in which we just know the main characteristics ...
0
votes
3answers
466 views

Change in transformer efficiency (leading power factor) with increasing load current

Does efficiency increase or decrease when the load current increases (assuming copper losses equal iron losses along with a leading power factor load)?
0
votes
2answers
285 views

Copper Strain Guage

My understanding is that strain gauges are constructed using Constantan etched onto a flex PCB. According to wikipedia Constantan is highly suitable strain gauge material due to its high gauge factor. ...
0
votes
2answers
206 views

Using Electricity and Magnetism to Lift non-ferromagnetic Copper Pennies

Is there any way (If you pumped a lot of current through a copper penny by shorting a circuit out through it with leads on either end) to create a magnetic field in the penny and lift it with a (very ...
1
vote
0answers
91 views

How to find the optimal section of a magnetic core of a transformer and of the windings?

I'm designing, as a hobby project, a simple step down transformer with a power rating of 300VA. These are the requirements of the design: Rated nominal power: S_n = 300 VA Nominal frequency: 50Hz ...
44
votes
9answers
15k views

Why are copper cables round?

Why are cables only made of round shapes? What is the advantage of it? Why aren't there triangular or quadrilateral or pentagon shapes of cables?
-5
votes
2answers
527 views

Copper wire thickness

What diameter copper wire (single core, not isolated, open air) is needed to safely conduct 120A current from 22.2V battery to a load on 30cm distance? Of course I searched on the Internet and there ...
1
vote
1answer
66 views

Proper thickness of different copper items normally used in Electric switch and socket?

When i open the plastic casing of electric switch and socket normally used in household like (250 V AC 16 A Switch , 250 V AC 13 A Socket) then i found different shaped copper bar. copper rod, copper ...
6
votes
3answers
753 views

How can I protect veroboard from corrosion/ tarnishing?

All of my veroboard-copper-tracks gradually slowly becoming blackish, scratch-like marks, or sometimes brown-black patches. Here's one from extreme (sorry for bad soldering, it is 7- 8 months old, ...
0
votes
1answer
500 views

Design of permanent magnet generator

I had taken this video as a reference to make my own permanent magnet generator: Permanent magnet generator. However, I am not able to understand how the copper coils are wound and outputted. ...
1
vote
2answers
4k views

How to calculate the resistance measured between probes in water

I have read already quiet a lot about the conductivity of water/ fluids but i can not find a formula to calculate the resistance between probes in a fluid. For example: use-water-as-a-conductor-for-a-...
10
votes
5answers
16k views

Does oxidized copper conduct electricity?

When the surface of copper turns that greenish oxidized color, does the resistance to current flow increase or isn't affected? For instance if the point of contact is secure and clean but bare ...
0
votes
1answer
204 views

9V battery positive soldering pad went off from my circuit board

OK, so I got a little problem. Today I was soldering something on this circuit board and the positive wire tore apart. I had to resolder the wire, but when I was heating up the old solder to remove it,...
0
votes
1answer
230 views

Question about Skin depth

It says that the energy of the EM wave decays rapidly if it travels through a good conductive material. Therefore, much of the wave is travelling on the surface of the copper wire. (since it decays ...
1
vote
2answers
2k views

How to remove Kapton polyimide film from Pyralux cupper sheet?

I want to etch Pyralux sheet and will follow this tutorial. The sheet I want to try is LF9120R and it is 1 oz of copper per square ft (or 305g/m^2). They describe ...
0
votes
2answers
2k views

Burning Temperature of Copper Winding of Motor

Burning Temperature of Copper Winding of Motor. I Have 3 motors 150watt 0.75Amp 220V in Copper and Aluminum and Copper clad aluminum. I want to know the maximum internal temperature of these motors ...
3
votes
1answer
434 views

Apply etch resist on copper

I cannot get my toner etch resist on to my copper board. I'm doing with the iron, but each time I try the ink does not transfer completely. I've tried many things - applying some water on it, ...
3
votes
1answer
332 views

How do wires connect to transistors?

So I was looking at the schematic of NPN and PNP transistors which basically involved layered blocks of doped material stacked. My question is how do wires connect to these devices? I think this ...
0
votes
1answer
105 views

Phone charger basic question

I'm (kinda) new to electronics and I have a simple question... So, I have a phone charger and I cut the wire because I wanted to connect the PWR and the GRD to another circuit. But when I connected ...
1
vote
5answers
523 views

Welding Thermocouple to Test Sample

I have a 3mm copper test sample that is going to get heated up, and I would like to know how hot it is actually getting. Previously, we have just held the thermocouple close to the sample, but we are ...
-2
votes
1answer
80 views

Materials for a speaker [closed]

if I have a flat, copper sheet and a magnet, Can I make a speaker? Or do I need magnet wire coiled up?
0
votes
1answer
109 views

Heat Kathal with D Cell batteries

I have Kanthal A1 26AWG (3.21 Ohms). I need to heat a small cardboard box (Tissues box) 15 degrees Celsius over the room temperature. And I am using 2 D Cell Batteries of 1.5V. I coil the Kanthal ...
1
vote
1answer
2k views

Add exposed copper to eagle board?

I am new to using eagle. I want to put some exposed copper pads that I can solder to on my board. The catch is that they cannot have through holes. I tried just making polygons in the top layer, but I ...
1
vote
1answer
86 views

Why are shorter leads preferred over longer leads?

I'm building oscillator circuits on a copper plate for an RF design class using the dead-bug method. I know that short leads between components is preferred over long leads, but why is this? I heard ...
0
votes
1answer
325 views

Which is the best material to create a magnetic field?

I'm trying to create a magnetic field and I'm also trying to induct electricity wirelessly to a light bulb. What I have to do is create a round coil but I'm not sure what is the most conductive ...
11
votes
3answers
6k views

Electricity not conducted by copper wire

Im am quite stunned as to what might be wrong. electronics beginner I bought today some copper wire, 20SWG /0.9MM from maplin (UK), for a project I am working on. There is no power going through ...