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Questions tagged [materials]

The raw materials that are used to make components, devices, or products. Use this tag if a more specific tag, like 'semiconductors' or 'ceramics', is not available.

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ESD on two different materials

I am conducting ESD testing on two types of materials with a setup that closely follows the 61000-4-2 standard. We have incorporated both isolation material and a ground plane into our setup. When I ...
DRF's user avatar
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3 votes
2 answers
398 views

Are fiber glass perfboards more durable than phenolic perfboards?

For example, in an identical setup, would a fiber glass perfboard last more years than a phenolic perfboard?
wyc's user avatar
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1 vote
3 answers
104 views

Kapton instead of air gap (ferrite core)

I'm working on a flyback converter topology and I want to create a 1 mm air gap in the ferrite core transformer in order to decrease AL. I didn't find one with air gape, I heard of a solution that is ...
Noureddine Bimgdi's user avatar
1 vote
1 answer
102 views

Would tempered glass be a good material to use within this simple axial flux permanent magnet motor?

I am in the design phase of building a simple axial flux permanent motor, and I am wondering if I should use a piece of tempered glass as both an insulating material and as part of the motor's frame. ...
user57467's user avatar
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1 answer
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Soldering with SAC on a glass PCB

I’m having trouble getting the solder paste to wet my glass PCBs. I am using SAC305 solder. Funny that it works fine on FR-4 but with glass it just balls up. Maybe it is because glass conducts heat ...
Eitan Benchabbat's user avatar
2 votes
0 answers
68 views

Plastic enclosure, ESD considerations

I am working on a product with three plastic components: an injection molded enclosure (Lexan, polycarbonate), a 3D printed mounting tray (ESD PETG, carbon nanotubes) onto which my PCB is mounted, and ...
Jay's user avatar
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6 votes
3 answers
1k views

What is the most common electronics IC package material?

I'm trying to make a thermal simulation of a PCB, and one of the parameters I have to put in the simulation software is the component package material. For most standard ICs as far as I know, it's ...
Alber's user avatar
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Could 94-HB board be used for SMD and THT soldering?

I have a circuit that I designed lately which is quite simple based on just 1 opamp and have an SMD and THT components (like a relay) and will be producing mass production in Chinese factories and it ...
Hazardous Voltage's user avatar
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2 answers
148 views

What are the primary industrial uses of gallium and germanium in electronics?

After the "neon shortage" struck I asked What are the ways in which semiconductor-grade neon is critical for manufacturing? and the answer(s) turned out to be quite informative. Al Jazeera's ...
uhoh's user avatar
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0 votes
4 answers
507 views

Mechanical design of a 7 segment display

If I want to custom design a 7 segment display, I can design a pcb with LEDs etcetera, but where could I find guides on how to design the shroud (shrouding the LEDs from each other, so they don't ...
kando's user avatar
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4 votes
1 answer
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Why would a non-nichrome resistive element be desirable?

While working on a circuit design the other day, I happened across a datasheet for a high-frequency resistor that specifically mentions that it uses a "non-nichrome resistive element". In ...
Hearth's user avatar
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1 answer
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What material exactly is used in the shiny antistatic bags?

I have another question, and in discussing the root cause of the issue there with an experienced RF engineer, he suggested placing a piece of antistatic ziplock component bag between the two most ...
anrieff's user avatar
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7 votes
6 answers
2k views

Is this food box safe for electronics?

I want to organize some components and wiring for power distribution for a small solar panel. Voltages up to about 24 VDC, and currents up to about 3 amps. Components inside will include switches, ...
Boann's user avatar
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1 vote
1 answer
115 views

What is the type of material used for the casing of semiconductors?

I am trying to build some thermal models for leaded and surface-mount diodes and transistors. Below is a picture of the TO-220 outline I got from the internet. What kind of material is the black part ...
FlakR's user avatar
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2 votes
1 answer
215 views

How good of a conductor is laser-induced graphene from Kapton tape (polyimide)?

I had intentions of making a DC electromagnet using laser-induced graphene (LIG), where the graphene will be used as a flexible electromagnetic coil. Something like those 24V electromagnets you can ...
Fulano's user avatar
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1 answer
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Can laser-induced graphene wires produce electromagnetic fields if a current is passed through them?

For those who don't know, laser-induced graphene (LIG) is a porous type of graphene that appears after exposing certain types of carbon-based materials with a laser. In this video, they made LIG on ...
Fulano's user avatar
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2 answers
909 views

Is silicone a thermal insulator or conductor?

I'm working on a circuit which will rest on top of the lithium polymer cell that powers it. A large portion of this circuit would be better off with minimal temperature drift so I'm planning to place ...
Ryan's user avatar
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3 votes
2 answers
543 views

1940s phototube collector material / datasheet for a tube

I have browsed countless pages on Google but cannot find a datasheet that tells you the material/element of the collector plate (the semi-circular plate in the tube) in a phototube (not a ...
Dian Sheng's user avatar
12 votes
5 answers
2k views

Working with wooden breadboard - recommended materials

For certain reasons I am interested in constructing low power circuits using wood instead of PCB/Protoboard as a surface upon which to place and join components. Although many might find this silly, I ...
sasukenebe's user avatar
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1 answer
95 views

Thermionic emission

I am doing the calculation for the "finding the temperature of filament". I tried with: Resistance (R=V/I) Resistivity (ρ = R·L/A) Temperature (T = (ρ-ρ0/ρ0-δ) + T0) Here ρ0, δ and T0 are ...
Hardik Chaudhary 's user avatar
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3 answers
307 views

PCB power plane copper and lamination thickness

One of the boards I have has these surface traces that run a lot of current through. I believe they are called power planes. Does anyone know a typical copper thickness (35 um?) ? Also, what is the ...
FlakR's user avatar
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0 votes
1 answer
195 views

Motor shaft adapter cannot be removed [closed]

Motors that I have worked with in the past are as simple as can be, having just one long cylindrical metal shaft sticking out from the magnetic interior (and thereby allowing the "end product ...
bobuhito's user avatar
  • 544
-1 votes
1 answer
85 views

What is the insulation material on the wire for this PCB transformer? [closed]

Circled below: It's a bit wrinkled. Can anyone tell just from the texture and color?
FlakR's user avatar
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2 votes
4 answers
396 views

Sustainable packaging for electronics and PCBs [closed]

As an electronics engineer, I design and have lots of PCBs contract manufactured. Every supplier I have ever used will always use packaging materials like PE foam pouches and bubble wrap. Some use the ...
monkey's user avatar
  • 121
12 votes
1 answer
707 views

What are the ways in which semiconductor-grade neon is critical for manufacturing?

This is a question about material use specifically in semiconductor manufacturing. CNN's Ukraine halts half of world's neon output for chips, clouding outlook begins: Ukraine's two leading suppliers ...
uhoh's user avatar
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5 votes
1 answer
617 views

What is the correct carrier concentration equation to use?

In this book I am reading, it gives the intrinsic carrier concentration as: \$ n_i = \sqrt{N_c\cdot N_v} \cdot e^{({\frac{-E_g}{2*K*T}})} \$ While another book says the carrier concentration is: \$ \...
Geno C's user avatar
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0 answers
2k views

What is the resistivity of n- and p-type silicon at operating temperatures?

Searching around for the resistivity of p and n silicon, so far I can only find data such as this: image source Notice it says "Room Temperature Silicon". What I want to know is the ...
DrZ214's user avatar
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0 votes
0 answers
119 views

Electrical conductivity of quartz glass at a certain temperature

What is the state of the material, from the electrical conductivity point, of quartz glass at 1100 K temperature, given the value of conductivity at 330 K temperature which is 1.5 × 10-12 S/m and 8.7 ×...
Alex Hrenciuc's user avatar
0 votes
1 answer
203 views

What's are the material properties that distinguish a magnetic containment disk from an induction cooker?

My picture below shows a coil carrying AC current, generating an alternating magnetic field. On top of the coil I've drawn a disk of high-permeability metal. Such as carbon steel, or mu-metal. If the ...
Eddie's user avatar
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0 answers
48 views

What do fixed values for the coercivity and remanence of magnetic materials really mean?

I've recently found a table in a book that lists values for the coercivity and remanence of some magnetic materials, one value per material. As far as my understanding goes, the shape of a material's ...
M S's user avatar
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0 answers
94 views

When is PCB thermal destruction desirable?

In the Wikipedia page for FR-4, it contains this excerpt: FR-4 epoxy resin systems typically employ bromine, a halogen, to facilitate flame-resistant properties in FR-4 glass epoxy laminates. Some ...
MicroservicesOnDDD's user avatar
0 votes
1 answer
108 views

What is that rubbery white substance in switching power supplies?

There is often some rubbery white substance (looks kind of like some hot-glue) in switching power supplies. In this example it's on the right side between those electrolytic capacitors. What is it; ...
t0bias's user avatar
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0 votes
1 answer
58 views

How does the resitivity of different material add up?

I have material A (e.g. carbon) which is a poor conductor with a resistance of around 700 ohm. what would happen if I melted some high conductive material (B) on it (e.g. copper). Would the resistance ...
Anwar Elhadad's user avatar
6 votes
3 answers
637 views

What's the right replacement for vintage "glass cloth insulation" that transfers heat in Variac?

I ripped apart a broken 1950s-era Variac autotransformer to diagnose an internal short in the core, and found a layer of gooey insulating fabric mat between the coil/taps and the mounting plate: The ...
BZo's user avatar
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0 votes
0 answers
41 views

Durability of SMD MEMS pressure sensors in pure oxygen enviroment

I have a question regarding durability/reliability of COTS SMD mems pressure sensors in oxygen rich (basically 100%) atmosphere under pressure of 1bar/1atm and temperature around 20C/293K. Sensor ...
Felix's user avatar
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0 votes
3 answers
654 views

Why silver plating for 3.5 mm stereo jack

Never thought about it until previous part I used, 3.5 mm stereo jack, gold plated, has depleted in the place I was buying it from. Research for replacement shows that such connectors may have gold or ...
Anonymous's user avatar
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1 vote
0 answers
247 views

What is the material of AC outlet plug pins? Is it standardized? Are they usually just stainless steel?

^ The title. I want to know if the material is food safe and wanted to know if it would be toxic if introduced into a material that will be consumed. It will be exposed to liquid constantly and I don'...
Adi's user avatar
  • 11
0 votes
1 answer
177 views

Material selection of heating element

I am interested in heating coils which are heated using Ohmic/Joule/resistive heating - specifically, how the material for the heating coil is selected. When I read about heating coil materials - ...
EddieP's user avatar
  • 273
1 vote
1 answer
523 views

ATX Power Supply Pin Material? (gold or tin)

I'm planning to use an ATX power supply to power a small set of 12v devices. I've read plenty of guides about adapting ATX -> bench supply, but I can't seem to find any mention of the connector ...
Kevin W.'s user avatar
2 votes
2 answers
3k views

B-H curve of structural steel

I have already been searching the web and COMSOL for a few hours, but I can't find the B-H curve of structural steel (more specifically S235JR - EN 10025.) In COMSOL there is a list of nonlinear ...
mss's user avatar
  • 123
0 votes
1 answer
89 views

Nichrome powder acting as a resistor

I’ve been doing some experiments recently with metal powders and I’m wondering if someone can help me interpret the results and give me some advice. I wanted to test how the metal powder would work in ...
EddieP's user avatar
  • 273
0 votes
1 answer
124 views

700 °C insulating material used for a spacer

I have a problem with finding a material that does not self ignite below 700 °C. It is supposed to serve as a 5 mm spacer that is also serving as a best thermal insulation as possible. The spacer must ...
MaDrung's user avatar
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0 votes
2 answers
95 views

If wire was thread

I have a small paper lantern that is hung on a thread. The lantern only weighs 20 grams, but it pulls the thread taught. I want to light the lantern with a small LED. Despite the increase in weight ...
Hackstaar's user avatar
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0 votes
0 answers
45 views

How can I stabilize unstable voltages over a silicon plate?

I've been working on an experiment where I investigate the hall effect over a circular silicon plate. Here is the schematic The two channels of the oscope are placed between the plate. Each of the ...
Jacob Lara's user avatar
0 votes
1 answer
57 views

Electrical Motor filler metal for laminated stacks

Looking at several cores from failed motors some will have a filler-type material that is inside the stack of laminates. This material is almost always silvery, and it does melt relatively low, ...
J.Hirsch's user avatar
  • 131
1 vote
1 answer
105 views

How can I make a 16x16 led pannel without losing the brightness intensity of each single led?

So, this is my first question here in this forum and I don't know if I'm doing this right. Then in fisrt place, I'd like to apologize myself if I'm doing something wrong or if my english is a little ...
Lucas Sievers's user avatar
0 votes
2 answers
536 views

Lead/Ball Finish on TI parts

I will be using the TMP117 in a design I'm working on, and was a bit curious to what the difference is between the different Lead/Ball finishes listed in the datasheet? There's a choice between ...
Lars Petersson's user avatar
0 votes
0 answers
40 views

Measuring conductance of the material used in fabricating Antenna

I have a composite polymer material with injected conductive particles inside it, making it a not-so-perfect conductor. I have also fabricated a simple dipole antenna using the wires made of the ...
Anonymous's user avatar
0 votes
0 answers
251 views

Effects of wood on UHF transmission

I have set up the following scenario in gprmax. From the results obtained using the software, I realized that when I increased the wood thickness the power received at the receiver increases instead ...
JoeyB's user avatar
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0 votes
5 answers
2k views

Are heatshrink tubings toxic for human health (e.g, using them in a "prolongedly-touched" place)?

Are heatshrink tubings toxic for human health (e.g, using them in a "prolongedly-touched" place)? E.g. if I use them for supporting the tip of my phone charger or the tip of a 3.5 mm Audio jack (for ...
NerdyNerdie's user avatar