Questions tagged [static]

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72 views

Is it Possible to Static Test With a Barbecue Lighter?

I'm working on an issue with a product where it freezes due to static shocks. I'm trying to recreate the issue and harden the product, but I don't have a real static testing wand like the test labs ...
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2answers
97 views

Are ESD safe tools necessary with proper setup?

My current setup is an ESD mat and ESD wristband both connected via alligator clips to unpainted screws that are screwed into a secondary PC power supply (not mounted in a PC case.) This power supply ...
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2answers
116 views

Grounding Yourself When Working On Electronics

I was wanting to discuss if using a wrist strap connected to a in unpainted screw on a pc power supply (this screw is a mounting screw it is not touching anything inside the power supply) that is not ...
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0answers
43 views

Vacuum sealing MSL and static sensitive components

My small business often builds circuit boards and we have some electronic components that need to be stored in a moisture and static controlled bag. Sometimes we order ICs in large quantities and want ...
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0answers
24 views

Static noise when using TDA2003 amp

I'm currently powering a couple of devices with an RQ-85B, amongst them a Tinker Board S (5V) and a TDA2003 module (12V), which outputs via an 8ohm speaker. These are all mounted in a large (...
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1answer
44 views

Static electricity when touching any metal after power down

I have a PC connected to a couple of devices via a serial port. The item labelled "COM" is a simple manual serial port switcher that requires no power. The item labelled "Rad" is a radio module ...
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1answer
62 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 ...
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3answers
97 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 ...
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1answer
199 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 ...
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1answer
71 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 ...
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1answer
40 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 ...
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4answers
169 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 ...
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1answer
108 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?
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3answers
5k 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
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1answer
427 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 ...
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0answers
189 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 ...
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1answer
78 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 ...
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1answer
112 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_{...
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1answer
330 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 ...
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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 ...
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1answer
312 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=...
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1answer
76 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 ...
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1answer
339 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 ...
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1answer
763 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 ...
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2answers
561 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 ...
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1answer
77 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 ...
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1answer
134 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 ...
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2answers
135 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 ...
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1answer
277 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 ...
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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 ...
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2answers
585 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
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3answers
5k 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 ...
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1answer
37 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 ...
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2answers
173 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, ...
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1answer
154 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 ...
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1answer
5k 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 ...
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1answer
472 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 ...
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3answers
410 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 ...
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2answers
54 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 ...
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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?
24
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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? ...
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1answer
263 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 ...
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2answers
15k 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 ...
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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 ...
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2answers
375 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
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3answers
6k 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....
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3answers
28k 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
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3answers
5k 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 ...
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2answers
7k 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? ...
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2answers
341 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 ...