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Questions tagged [static]

The tag has no usage guidance, but it has a tag wiki.

0
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1answer
34 views

Optimal Grounding for a PVC Dust Collection System?

It is common in woodworking (A hobby of mine) to make a dust collection system (Basically a tube hooked up to a vacuum to carry away dust created from automatic woodworking tools) out of PVC. We'll ...
4
votes
3answers
88 views

If two objects are grounded, why do they still need to be bonded? And if they are bonded, why does each still need to be grounded? (fire safety)

When transferring a flammable liquid, both the container and the receptacle are supposed to be grounded and bonded. If they are both grounded, shouldn't the change on each be equal to ground? And if ...
0
votes
0answers
29 views

Static noise on a TDA7492 Bluetooth sound amplifier board?

I have a KKmoon TDA7492 bluetooth sound amplifier board with an AUX interface (https://www.amazon.co.uk/gp/product/B075QZ19VJ/ref=ask_ql_qh_dp_hza). The issue I have is that whenever I connect ...
0
votes
1answer
112 views

How does this electrostatic generator operate?

I'm trying to understand how this piezoelectric static generator works. I've found this video and I would love for someone to explain to me the operation of this device, and maybe assist me with a ...
0
votes
1answer
51 views

Can leakage current to ground generate static electricity?

I'm having a weird issue at my workplace where some industrial equipment is present. Almost every time I leave my laptop (with grounded aluminum body) for a while and come back I will get a quite ...
0
votes
1answer
26 views

Static noise when electric guitar plugged into amp

I have an Epiphone Wilshire that is producing a "static" sounding noise when plugged into an amp. I removed the cover plate and found a loose, black wire (ground?). It looks like the wire is connected ...
2
votes
4answers
105 views

Flooring for home lab

I am setting up a home electronics lab for projects with my kids, currently ages 4 through 10. What type of flooring would work best? We will be doing art projects in the same room, so we need ...
-1
votes
1answer
74 views

How is this copper showpiece making static electricity

I'm trying to make a showpiece which generate static electricity just like in this YouTube video LINK Does it have Tesla Coil (Slayer Exciter) inside it or Negative Ion Generator?
11
votes
3answers
4k views

What is the smallest metal object you can ground yourself with?

Say I am installing a new CPU in my desktop motherboard and I am interested in grounding myself (by touch or one of those nifty bracelets) to avoid damaging my components. What is the nature of ...
2
votes
1answer
223 views

Usage Of Static Electricity To Remove Dust?

If I have a fine metal mesh -- say a stainless steel mesh at 50 micron, and I'm having dust build up on it, can I use static electricity to remove the dust? I have another mesh that's 500 micron, and ...
0
votes
0answers
152 views

Can a grounded static-shielding antistatic bag be used as a circuitry work surface to protect from ESD?

Basically, I have looked around about how to take proper care with respect to ESD and I am quite confused. I know an antistatic bag of any type would not provide additional protection from ESD if used ...
-4
votes
1answer
75 views

why dont we just use ion wind flowing through evacuated pipes?

Why dont we just use ion wind flowing through evacuated pipes? I ask this because if we reduced the atmospheric pressure in the pipes somewhat, and made them out of a cheap yet durable insulating ...
1
vote
1answer
100 views

Calculate current of resistor with Norton's Theorem

I have a problem with the following circuit: simulate this circuit – Schematic created using CircuitLab I have to calculate the following data using Norton's theorem: \$R_n\$ \$A_n\$ \$I_{...
0
votes
1answer
69 views

Why do I get terrible static in my phone mic / recording when my phone is charging from the mains? [closed]

I live in an apartment block in the UK. When I record my voice into my phone's voice app when the phone is charging from the mains, I get a terrible constant static sound that is not present when the ...
14
votes
2answers
1k views

How does static dissipative foam work?

I am planning to build a grip-release sensor using the foam. I'm pretty interested in the way it works. Does the resistance in circuit increase or decrease when force is applied onto it? And this will ...
0
votes
1answer
203 views

Anti-Static Soldering Mat - Makes hair stand on end?

I bought this (supposedly) anti-static soldering mat, because I was ruining my standard ESD mat when I would go to reflow things. https://www.amazon.com/gp/product/B06X97Y379/ref=...
0
votes
1answer
74 views

Could sliding down a slide damage my camera? [closed]

Specifically one of those plastic spiral slides - I was at the playground with my children yesterday and when we went down the slide there was enough static generated to stick our hair on end. Of ...
0
votes
1answer
240 views

Static Timing Analysis for I2C

Could Anybody help in getting started on I2C signal Static Timing Analysis. I just wanted to start with 1 single master slave combination. I have MPC8343EA as Master and TMP100 as slave. I know the ...
2
votes
1answer
647 views

Voltage divider to measure Van De Graaff generator

Imagine one wanted to measure the discharge from a Van De Graaff generator using an oscilloscope. The voltages are way beyond what a typical scope and probes can handle. I was thinking about how a ...
1
vote
3answers
473 views

Cleaning a computer CPU - Do gauze pads with polyester in them cause ESD?

Do gauze pads, the type used for scrapes or burns, cause ESD if they have a mix of polyester in them? What if the polyester mix gauze pads have rubbing alcohol on them too? They don't have any lint ...
0
votes
1answer
76 views

Forensics: electrostatic detection circuit for lifting “indentations” from documents

Wikipedia explains that an EDD: ...is a specialized piece of equipment [used to] reveal indentations or impressions in paper which may otherwise go unnoticed. The electro-physical basis whereby ...
0
votes
1answer
107 views

Floating ground plane and static

I have two ground planes, one of which is connected to Earth (chassis). The other is for PT100 circuitry and is floating, but connected to the body of the PT100. Is there any standard procedure for ...
0
votes
2answers
130 views

Static discharge of large items (metal)

We have a cabinet which is flushed with dry air and the metal instrumentation inside it tends to build up an unwanted charge. Obviously parts of the machinery are not sufficiently earthed (working on ...
1
vote
1answer
230 views

When shipping electronic components, can I reduce static by using dryer sheets or sprays?

Can I use dryer sheets, or anti-static spray on polyurethane foam to reduce static between the foam and the polypropylene container the foam is in? I need to ship some ESD sensitive electronics ...
3
votes
1answer
2k views

How to protect electronics from static electricity during shipping

I have some electronics (EDIT: electronics are in enclosures, but with lots of wires coming out of the enclosures; the electronics are a part of a prototype) with ESD sensitive components I need to ...
0
votes
2answers
521 views

Modifiying variable inside of Interrupt vector. AVR

My question is again about modifying variables inside the ISR. If the variable used only inside of ISR, I don't have to declare it as volatile, right? After some researching, I figured out that ...
3
votes
3answers
4k views

How to remove noise from power adapter

I am making an audio amplifier using an LM2879. I am using the schematic provided in the data sheet. For a starting point, this design works pretty well, although the base cutoff point could be a ...
-3
votes
1answer
35 views

wanting to know the equations for calculating the output of a generator that has a static input

There is a variable speed generator that is 100% efficient. It has a 2 ft. diameter pulley attached to its shaft. There is 100 ft. of cable attached to the pulley and a 1000 lb. "static" force ...
-1
votes
2answers
146 views

Why will metal make static electricity dangerous?

I was recently at one of those science shows where, as part of the demos, a couple of volunteers were charged up with a van de Graaf generator so that their hair would stand on end. Standard stuff, ...
0
votes
1answer
96 views

electrostatic seperator build questions

I am building an electrostatic seperator for plant material. the two materials I am trying to seperate have a negative charge but one responds a lot more to positve charges so I feel there will still ...
0
votes
1answer
4k views

How do I get rid of speaker static?

I made the basic TPA1517 circuit as shown on page 11 of the datasheet. When there is nothing plugged into the input, there is a lot of static. When I do plug something in, there is less static, but it ...
0
votes
1answer
378 views

Getting rid of electrical noise produced when one touches amplifier and amplifier's dials

I purchased a Lepai LP-2020A+, which is a pretty good little amp for the price, but I've modified it to make it much better and decided it deserved a better casing to look the part, too. So I ...
1
vote
3answers
299 views

How do I store and transport microcontroller boards safely?

I'm looking for a carrying case for my various electronics components, mostly various microcontroller boards (Arduino, Teensy, etc). I've seen a lot of people use plastic tool boxes, sometimes with ...
0
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2answers
52 views

Question about Static charges & dissipation

I have been practicing ESD safety procedures in my workplace. We typically use grounded ESD Wrist Straps and ESD mats. If I correctly understand the static charges stay put until they come in contact ...
2
votes
2answers
1k views

In order to charge the glass rod, why do we RUB it with a sillk cloth?

Why can't we get the same results if is wrapped with a silk cloth for some time? What actually happens when we rub it?
23
votes
2answers
4k views

Anti-static bags - safe to support powered circuit boards?

Is it generally safe to rest a low voltage powered up circuit board on an anti-static bag when debugging? A simple meter reading suggests it is a good insulator, but it must conduct to some extent? ...
1
vote
1answer
241 views

Does a Wimshurst machine work fine with normal glass disks?

I want to build my own Wimshurst machine and I cannot find plexiglass disks. However, in our town there is somebody that cuts normal glass circles–so I wonder if normal glass disks would replace ...
13
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2answers
13k views

How often does static kill computer components? In the past? Now? What's the difference?

Full disclosure: I'm a computer engineer and a software dev. I'm not an electronic engineer. If this question has already been answered, please link to it, I've done cursory searches on Google and SE ...
10
votes
1answer
3k views

Getting rid of static charge in fuel tanks

Back in the olden days, fuel trucks had a chain suspended from the axle to the ground to dissipate the explosive static charging fuel will buildup from sloshing around inside a tanker. I remember ...
0
votes
2answers
325 views

Circuit for measuring static charge

I want a cheap tool for investigating the source of and solutions for static electric shocks (from a vehicle). This link shows a particularly attractive solution; just a FET, LED, resistor and ...
10
votes
3answers
5k views

Avoiding static shocks from vehicles

I don't entirely understand static electricity; particularly how it seems to flow through rubber shoes and paint, but seemingly not rubber tyres or car seats. I am tired of getting shocks from my van....
15
votes
3answers
24k views

Why does a sweaty finger neutralise the touch-sensor on my phone screen?

My experience is that when I'm running, my fingers "don't work" on my phone screen. My understanding was that the sensor on a touch screen works on static-charge, ie that you act as an 'earth' to ...
19
votes
3answers
4k views

Static shocks all over the building

I just came from the local library, it’s quite big, and most of it is made of an architectural design using mostly painted metal book shelves painted with some kind of anticorrosive paint along with ...
10
votes
2answers
5k views

What is the purpose of input protection on USB (or at all)?

I have seen quite a bit where reverse biased diodes are used to clamp input voltages when spikes occur. What is the typical reverse breakdown voltage for a diode used in this type of application? ...
0
votes
2answers
308 views

electron affinity and measuring open circuit voltage of insulators through rubbing

I am rubbing two insulators, polyester and teflon on each other. Teflon has more electron affinity than polyester. I need to know exactly how much charge is transfered to teflon and polyester in the ...
103
votes
13answers
25k views

Measuring feline capacitance

When I pet my cat, and then touch her on the nose, I get a little shock. Sometimes, when she walks up to something, her nose sparks and she jumps back and puffs out. I was wondering how I might go ...
2
votes
1answer
381 views

ESD Anti static mat Grounding and AC volts

I have an rubber ESD anti static mat on my bench that came without the snaps. I installed 2 snaps, one on each side of the mat. I connected the ground wire from the snap on the mat to the ground in ...
3
votes
1answer
3k views

What is the difference between a static and non-static expression in vhdl?

suppose if I have two signal declarations as follows signal x:std_logic_vector(1 downto 0) := (others => '0'); signal y:std_logic_vector(1 downto 0); does ...
0
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2answers
133 views

How to avoid static shocks on equipment

Instead of grounding myself with a bracelet, can I wear rubber gloves? Will this prevent any equipment I touch from getting shocked?
0
votes
1answer
192 views

Electric field around tape

So, there's a tape with width of 2a, -a on the -y and a on the y, and it very long, penetrating the the plane of picture, it's charge density (dQ/dS) is σ=σ0 * y /a , σ0 is a constant. What is the ...