Questions tagged [static]

Anything related to static electricity, i.e. the physical phenomenon in which electric charges accumulates on objects even in absence of a steady current flow. Do NOT use for questions about electronics in a state of equilibrium (i.e. as opposed to transient or dynamic behavior).

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73 views

ESD damage to old system [closed]

I was doing a capacitor check on an old xbox motherboard. I always knew that you could damage a motherboard by touch but at the time either my mindset was off or overconfident in its supposed rarity. ...
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1answer
39 views

Static charge behavior (in ref to Grob's Basic Electronics book, 13th Ed, p33)

I have a question pertaining to the aforementioned book in a section titled "Potential between Different Charges". The paragraph goes as follows: When one charge is different from the ...
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What keeps frying my RF switches?

Short version: What might be breaking the first sensitive component connected to an ungrounded 14cm UHF dipole antenna mounted 30' above the ground? Could it be related to static electricity? I have ...
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129 views

Protect ESP32 GPIO from ESD events, resets on inputs!

I'm working on a product that uses the ESP32 WROOM module. There are 6 exposed pins that user can touch, shown by the header attached. There is a piece of plastic that slides across a plastic ...
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71 views

How to get static on CRT screen instead of black screen?

The TV in question is a Sony Trinitron KV-14M1D CRT. I know it sounds backwards but I need the screen to show white noise for a project (oscillograph); but there seems to be a static block that ...
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2answers
70 views

Theory Question: Speakers don't work unless I poke soldered points with screwdriver

In case you couldn't tell by the title, I don't really have any idea what I'm doing with electronics. Something happened though, and I am really curious about it. Don't know how to ask it specifically,...
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139 views

Static shielding bags for PCB protection

As I understand it, metallic static shielding bags act as a Faraday Cage once sealed which protects the contents against external electrostatic discharges. They also prevent triboelectric charge ...
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21 views

How can I simulate different realizations of these joint random variables with the given PMF?

If I have two Discrete Random variables X and Y which have the joint PMF: \$P_{xy} = c(x^2 + y^2)\$, where \$x\$ belongs to {1,2,4} and \$y\$ belongs to {1,3} I tried to make two discrete random ...
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228 views

In an isolation transformer, to what is the electrostatic shield winding attached?

In the following diagram of an isolation transformer, found on Wikipedia here for the diagram and also here for the definition of Isolation Transformer, there is a special winding in between the ...
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1answer
144 views

What "mode" is static electricity (lightning?) Is it common-mode, differential-mode? It seems half-way, or "mono"

The common-mode or differential-mode designations assume two conductors, one in-phase, the other anti-phase, but a static circuit is different because the "conductor" is concentrated in thin ...
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75 views

Is a loose psu plugged into a three prong outlet but off a good thing to clip to an esd mat aligator clip?

I bought an anti static mat, ifixit portable, so I wear the wrist strap, clip it to the mat, the ground wire that came with the mat clips the the mat the other aligator clip clips to the grill of a ...
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80 views

How real an issue is static for hobbyists (Arduino etc.) for parts storage?

The parts I buy come in all kinds of packaging: Here we have a USB charger in a basic anti-static bag, Kapton tape and MOSFETs in ESD bags and a small development board in a plain plastic bag. I'm ...
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188 views

ESD Capacitor Calculation, 330Ohm Series Resistor and ESD Clamp Voltage

I have a input power filter circuit. It has ESD Protection capacitors which help to protect the downstream circuit from ESD Pulses. ESD Capacitors Specifications : C0001, C0002, C0003, C0004 = 47nF, ...
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78 views

How bad are dusters on PCBs?

There are 3 types of dusters that I know of: Microfibre Electrostatic Vehicular AFAIK, the microfibre variant relies more on contact with dust than on electrostatic attraction, unlike the ...
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2answers
77 views

Can static be discharged when removing sensitive electronics from a static shielding bag while you and the bag are at the same voltage?

Suppose you have a static/ESD shielding grey bag housing electronics sensitive to ESD. I believe that this type of bag has a static dissipative surface and a conductor on the inside serving as a ...
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102 views

If antennae work best at full, half or quarter wavelengths, why don't received signals at 1, 1/2 and 1/4 wavelengths interfere with each other?

How does a simple radio receiver-antenna differentiate between incoming wavelengths that are the same wavelength as the antenna, one-half and one-quarter? Or would I just hear static unless I have a ...
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1answer
230 views

Would the static charge from a silicone work mat be dissipated by an ESD mat if placed on top of it?

I know the proper rubber mats that are both ESD safe and heat resistant are quite expensive, and definitely out of the price range of a beginner hobbyist like me. I have also read that the silicone ...
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121 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
824 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
720 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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1answer
53 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
523 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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155 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
393 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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160 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
77 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
432 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
137 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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7k 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 ...
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1answer
894 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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240 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
80 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
143 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
2k 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
409 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
79 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
472 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
921 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
716 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
79 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
162 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
196 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
389 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
719 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 ...
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3answers
6k 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
238 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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224 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 ...