A new meaning for 'electric blanket' - Page 1
Forum section: electronics / general

author: NE666
author_rank: Frequent Contributor
timestamp: July 25, 2025, 07:30:39 am
content: To go with your purchases of organic cotton tinfoil hats, you may now also own an 'organic cotton earthing bed sheet'.I $h1t thee not;https://www.amazon.co.uk/dp/B0F21SD4H2Might be useful for insomniacs with a backlog of PCBs to assemble?

author: Analog Kid
author_rank: Super Contributor
timestamp: July 25, 2025, 07:35:43 am
content: QuoteO, Humanity, I weep for thee ...

author: paul cotter
author_rank: Regular Contributor
timestamp: July 25, 2025, 07:51:56 am
content: I'm an old fogey with likely not that many years left but I do wonder where humanity as a species is headed. I am quite sure every generation of luddites has expressed similar misgivings but it is different now- the rise and rise of the antiscience brigade is an alarming new phenomenon.

author: Kean
author_rank: Unknown
timestamp: July 25, 2025, 07:52:49 am
content: At least it isn't a direct earth connection... so at least it isn't going to harm those with more money than brains.Quote

author: BadeBhaiya
author_rank: Regular Contributor
timestamp: July 25, 2025, 08:08:13 am
content: Looks like maketing department found a new market for giant anti static armbands

author: Gyro
author_rank: Super Contributor
timestamp: July 25, 2025, 09:15:15 am
content: This one keeps coming up every couple of years...https://www.eevblog.com/forum/dodgy-technology/grounded-bedsheets/https://www.eevblog.com/forum/dodgy-technology/harness-the-earths-energy-while-you-sleep-(plug-your-bed-into-mains-wiring)/https://www.eevblog.com/forum/dodgy-technology/taking-esd-a-bit-too-far/

author: paul cotter
author_rank: Regular Contributor
timestamp: July 25, 2025, 09:19:46 am
content: Even with a high value resistor in-line there are dangers. A nearby lightning strike to ground could could induce a very high di/dt sufficient to turn the resistor into a near zero ohm ball of plasma, assuming it is a standard component and not a special component suited to extremes.

author: SteveThackery
author_rank: Super Contributor
timestamp: July 25, 2025, 10:29:03 am
content: Quote from: paul cotter on July 25, 2025, 09:19:46 amIt's OK - we could do with culling back some of the anti-science crowd. Darwinism in action.</irony>

author: Haenk
author_rank: Super Contributor
timestamp: July 26, 2025, 06:00:41 am
content: Surprisingly cheap. I wonder if they simply forgot the trailing 0 when uploading the price to amazon.

author: 5U4GB
author_rank: Super Contributor
timestamp: July 26, 2025, 09:05:04 am
content: Quote from: SteveThackery on July 25, 2025, 10:29:03 amNot necessarily anti-science, a friend of mine has one of these but isn't anti-science, anti-vax, or anything like that, she just has a somewhat muddled understanding of electro-technology stuff. Having said that, my knowledge of her field of accountancy makes her knowledge of electronics look genius-level.

author: BrianHG
author_rank: Super Contributor
timestamp: July 28, 2025, 01:36:55 am
content: But that's only the bottom sheet, what about the top?Say my house is directly beneath 300kv high tension lines and I ground only my bottom bed sheets, having my body acting as a 60hz antenna, picking up the 300kv leakage from the power lines above, say I sweat just a little for a bit of conduction, do I not risk electric shock or burns?See my example attached image, there is a bit of power there and a grounded bed sheet adds a low impedance conductive path straight to ground.A potential life threatening hazard warning should be sold with these sheets.

author: coppercone2
author_rank: Super Contributor
timestamp: July 28, 2025, 01:46:37 am
content: I got scared I had a blanket once, when you ran your hands through it at night it would make visible trails of ESD. One of those synthetic fuzzies, it was extremely warm for its thickness.I wonder if silver keeps the blanket colder

author: paul cotter
author_rank: Regular Contributor
timestamp: July 28, 2025, 10:08:11 am
content: There is no risk from overhead high voltage lines, unless they fall on you. To receive a dangerous shock it is necessary to have current flow and the only mechanism for such current flow is the capacitance of the line to the "victim". At 50/60hz the reactance of the miniscule capacitance involved will produce a negligible current flow. Just because the mercury vapour tubes light dimly does not represent a hazard to the human body. Lightning strikes are where the hazards are, IMHO.

author: voltsandjolts
author_rank: Unknown
timestamp: July 28, 2025, 10:20:34 am
content: Quote from: NE666 on July 25, 2025, 07:30:39 amAlso discussed here:https://www.eevblog.com/forum/dodgy-technology/grounded-bedsheets

author: BrianHG
author_rank: Super Contributor
timestamp: July 28, 2025, 09:09:28 pm
content: WTF, after reading this thread, now all I see are ads for grounding blankets. Do they make a web browser that blocks BS?

author: paul cotter
author_rank: Regular Contributor
timestamp: July 29, 2025, 09:13:32 am
content: A web browser that blocks BS? Could be useful but it would remove my source of entertainment.

author: Halcyon
author_rank: Unknown
timestamp: September 01, 2025, 12:40:07 am
content: Quote from: paul cotter on July 29, 2025, 09:13:32 amAww then I won't be able to laugh at flat earthers.But to answer Brian's question: Brave Browser. It does a fantastic job of blocking ads and fingerprinting.

author: tggzzz
author_rank: Super Contributor
timestamp: September 01, 2025, 08:09:42 am
content: Quote from: BrianHG on July 28, 2025, 09:09:28 pmBlocking AI/LLM slop would be a good start, and test case.

author: SiliconWizard
author_rank: Super Contributor
timestamp: September 01, 2025, 01:34:40 pm
content: Quote from: BrianHG on July 28, 2025, 09:09:28 pmDid you click on the Amazon link?

author: Simmed
author_rank: Frequent Contributor
timestamp: September 01, 2025, 01:49:02 pm
content: i proposea better grade of "connection" to ground

author: Analog Kid
author_rank: Super Contributor
timestamp: September 02, 2025, 01:06:36 am
content: Quote from: Simmed on September 01, 2025, 01:49:02 pmYeah, they say that doesn't even hurt that much if you use enough nails.

author: RJSV
author_rank: Super Contributor
timestamp: September 16, 2025, 04:38:47 am
content: BrianHG:It's not (your example) 300 kv that I'd worry about, but rather the Volts per meter field strengths, because that helps get you ready, to tackle the 3-D world, and effects.Casually (am I doing this right ?). let's say that you've got 30 meters between the ground (bed) and wire. That's going to get you 10 KV roughly, across or through your body., if you are huge, at 1 meter thick.Sounds impressive, but still I don't feel scared, but rather now wondering:Where does that casual analysis go, from here ? Air insulation effects would help quench any current flow. That's sine-wave or near, AC but I'm not sure if capacitance needs to be considered...(where ?).I might lay there, on a bet, on any night where good judgement is absent. But I don't drink, really, although sometimes it's a nice treat.What's the geometry, and field analysis going to look like, to explain to some beginner ?(I'm going to need the beginner's section for the rest of my high voltage physics questions). Thanks,...Rick B.