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Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
yes, when I was much younger I had a phase when I used to shock myself and friends with a battery/transformer for 'fun', 10, 20 or more holding hands in the playground ..... never a shortage of volunteers/victims :)
my kids like sweets so sour that they turn your face inside out !
must be something to do with youth,
now I'm old and boring and I tend to avoid electric shocks and sour sweets.
(we did amuse ourselves at work with stupidly hot chilli flavoured chocolate recently)
Registered Member #5598
Joined: Thu Jul 05 2012, 11:18PM
Location: Llandudno, north Wales.
Posts: 20
I remember many years ago when me and a friend were rummaging through an old train yard and we found this box, fairly small but very heavy. Inside the leather lid was a handle which went onto it and it had two output wires and some gauges. The faster you wound the higher and nastier the shock it gave you. Needless to say we used to have competitions as to who could hold on the longest, I won but do still have a small weird scar on my wrist where I wrapped the wire round to win and it actually left a burn.
What the machine was I will never know.
Now that was fun!!!
On the other hand I also have a scar on my head and spent three days in hospital which was not fun after been thrown 20ft into a fence because when it was raining at the same yard I accidentally caught a third rail. Don't really remember much apart from OUCH severe pain and waking in hospital feeling like I had had a horse kick every bone and muscle in my body.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
The box that you found was probably a what I refer to as a 'megger' a high voltage insulation tester.
Those I use at work give 250V, 500V or 1000V dc from a small internal inverter A custom one we used for virgin pantograph testing was very large, I think the maximum output was 100 kV but never used above 50kV or 75kV 50 Hz ac. not my area but I was curious as it looked like a water tank with a Tesla coil on top, turned out to be a hv transformer under oil and a high voltage insulator/terminal.
VERY useful for testing igbt, thyristor etc. in the motor drives that we repair. 'megger' a trade name I think ( ) ... like Xerox for photocopier, Hoover for vacuum cleaner etc.
P.S. a used megger from eBay is a very cheap low power high voltage dc source. test or charge hv capacitors etc. 'needs calibrating' is probably professional/tradesman use that requires a renewed certification/cost - probably a good buy Take care, even 68nF at 1 kV will make you jump (I know!)
Registered Member #3926
Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525
Harry wrote ...
IIRC Platinum was, ZVS flybacks aren't deadly. Possibly under ideal conditions they are. I have a microwave inverter transformer, THAT is deadly with ZVS, a few hundred mA at a couple of kV
I was yes, mainly because I was very stupid, I hope no one else does get shocked by the ZVS, it's can be deadly, it depends how much power you are pushing trough it, mine was about 300watts as the voltage was sagging badly, the PSU was built by I, needs more smoothing caps.
Anyway if I can remember it hit my left hand and went through my chest out my right hand to my grounded PSU.
I hope this never happens to anyone else, nothing worse than being shocked..
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zvs deadly?
