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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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21st Sep 2018, 7:20 pm | #81 | ||
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Re: Bach with sparks!
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Also for the time being, very limited capacity to find a work space that can be left in situ- I don't have that here. A lovely local co-creative venue called 'HackSpace' where I used to do machining and metalwork closed down as the lease expired and rents increased. But I'm hoping to get started once autumn/ winter set in and - bearing in mind my physical limitations too -I will post if and when I'm satisfied that I've fulfilled the standards I originally set. Otherwise I'll keep quiet until I have. It's quite a nice coincidence, as I think the forum can really only give space to one project of this rather extreme kind at a time! So no great hurry here
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Al |
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1st Nov 2018, 5:40 pm | #82 |
Hexode
Join Date: Jul 2016
Location: Ashby de la Zouch, Leicestershire, UK.
Posts: 253
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Re: Bach with sparks!
I am still here, but recently had a small stroke which is a wake up call for me.
Not sure what caused it yet, still having various tests. In the unlikely case that it was caused by RF energy from the teslas in my brain that caused it I am going to build a Faraday cage, RF grounded, to completely surround the 3 SSTCs before I start any experimenting again.
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"One small step for man".....because he has arthritis. www.retinascope.co.uk Albert. |
1st Nov 2018, 6:02 pm | #83 |
Nonode
Join Date: Feb 2005
Location: Worcestershire, UK.
Posts: 2,534
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Re: Bach with sparks!
Glad you're OK. It's most important to look after the smooth running of that prodigious brain of yours! Get well soon.
Steve |
1st Nov 2018, 9:42 pm | #84 | |
Hexode
Join Date: Jul 2016
Location: Ashby de la Zouch, Leicestershire, UK.
Posts: 253
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Re: Bach with sparks!
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Of course, Potty, with the p, might better describe myself, methinks !
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"One small step for man".....because he has arthritis. www.retinascope.co.uk Albert. |
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2nd Nov 2018, 11:36 am | #85 | ||
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Re: Bach with sparks!
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Best of luck with your health and recovery , Albert.
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Al |
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2nd Nov 2018, 1:16 pm | #86 |
Hexode
Join Date: Jul 2016
Location: Ashby de la Zouch, Leicestershire, UK.
Posts: 253
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Re: Bach with sparks!
Thanks Al for that. Stroke was all over quickly but automatic ban on driving after a stroke for 1 month was a blow.
The Faraday will have 1 inch square holes in it so OK for my tesla's running at about 250 kHz Will stop RF but allow one to see the sparks. Planning one big Faraday to screen all three. Don't know what Bach will eventually think about being trapped inside a cage.
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"One small step for man".....because he has arthritis. www.retinascope.co.uk Albert. Last edited by Viewmaster; 2nd Nov 2018 at 1:21 pm. |
2nd Nov 2018, 2:31 pm | #87 |
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Re: Bach with sparks!
Yes, Albert, the driving ban sounds like a frustrating sitch. It will soon pass, though !
Your Faraday cage sounds good close to microwave frequencies! You’ll still see plenty of action and if will limit damage to consumer equipment, help prevent some RCD trip-outs ( when caused by ground loops in consumer equipment) and crucially, keep fingers away from pulsing high-current circuits connected to low impedance mains. So all in all , a sound plan. And all the glory of Bach will still shine through!
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Al |
2nd Nov 2018, 5:49 pm | #88 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,667
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Re: Bach with sparks!
Sorry to hear of your stroke, glad your ok. "In the unlikely case that it was caused by RF energy from the teslas in my brain that caused it" - is this a possibility, if however unlikely?? Didn't know high energy RF could be dangerous, though thinking about it it's not too dissimilar to microwave energy.
Andy.
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Curiosity hasn't killed this cat...so far. |
2nd Nov 2018, 6:02 pm | #89 | |
Dekatron
Join Date: Nov 2006
Location: London, UK.
Posts: 3,496
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Re: Bach with sparks!
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I am not saying they can't damage human tissue as they obviously can under very unnatural circumstances that would have to be set up deliberately. The wavelength of Albert's coils is approx 1200 metres = 1200 *100cm =1.2E5 cm So Albert's waves are 10,000 times longer than the wavelength of a domestic microwave oven. They absolutely can't penetrate human cells. On the other hand, the very large charges that build up in things that surround a Tesla coil in operation can and easily do lead to RF burns. Typically, we'll see pretty brush corona bursting out of the corners of metal objects, including nearby white goods, etc. I've had a burn from a nearby metal object even with just 20W RF out when tweaking a drive circuit --- and Albert's cooking with a few hundred watts of RF. I'm not the big expert on RF burns, except that even a small one does noticeable damage to visible tissues like fingertips. I have no idea what they can do to the inside of the body. I'd suggest caution around anyone with cardiac tendencies including arrythmias, or allowing any RF to pass across the heart. I'm very very skeptical of the 'safety' of demos which have a Tesla coil operator demonstrating the 'harmlessless' attributed to the 'skin effect' (literally, in this case, of human skin) while allowing a plasma discharge to a finger or hand with massive levels of power. Note, I am saying this is NOT safe. I have never done this and will never do it.
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Al Last edited by Al (astral highway); 2nd Nov 2018 at 6:08 pm. |
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3rd Nov 2018, 7:52 am | #90 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,667
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Re: Bach with sparks!
Thanks Al, interesting stuff.
Andy.
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Curiosity hasn't killed this cat...so far. |
7th Nov 2018, 12:24 pm | #91 |
Hexode
Join Date: Jul 2016
Location: Ashby de la Zouch, Leicestershire, UK.
Posts: 253
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Re: Bach with sparks!
Here's a mock up of the trio inside a rough assembled Faraday cage without
any front to it yet. In case of arcing from any tesla to the cage I am going to part line it with clear polycarbonate sheeting where any arc may occur Only one tesla is working. Other is near finished and the baby one not yet final assembled. Looking more like Brighton Pavilion by the day.
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"One small step for man".....because he has arthritis. www.retinascope.co.uk Albert. |
8th Nov 2018, 10:52 am | #92 | |
Pentode
Join Date: Aug 2008
Location: Melbourne, Australia
Posts: 213
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Re: Bach with sparks!
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9th Nov 2018, 8:44 am | #93 | |
Hexode
Join Date: Jul 2016
Location: Ashby de la Zouch, Leicestershire, UK.
Posts: 253
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Re: Bach with sparks!
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Having come so far I must go on ……with due caution. , I am engaged in various non spark projects as well, such as repairing a Sullivan's mirror galvanometer. Might use it to measure the spark intensities.
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"One small step for man".....because he has arthritis. www.retinascope.co.uk Albert. |
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9th Nov 2018, 10:30 am | #94 |
Dekatron
Join Date: Jul 2007
Location: Penrith, Cumbria, UK.
Posts: 3,687
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Re: Bach with sparks!
You need to ask auntie Google about ICNIRP.
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Regds, Russell W. B. G4YLI. |
19th Jan 2019, 5:08 pm | #95 |
Hexode
Join Date: Jul 2016
Location: Ashby de la Zouch, Leicestershire, UK.
Posts: 253
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Re: Bach with sparks!
It's been on the back burner recently, or rather the back sparker.
Other fish to fry I'm afraid. But working on it again in between times. The music I am now getting has great distortion on some notes. Maybe I am overloading an input, somewhere, somehow? More anon.
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"One small step for man".....because he has arthritis. www.retinascope.co.uk Albert. |