My guitar is hurting me!

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Hey, Pete - have you got any "pictures" of your screwdriver/pliers carrying case and your test equipment? A couple of shots of "oscilloscopes" would be nice too. Can you put a "loaf of bread" in the shots so that we can tell the pics aren't "googled"?

Thanks.

Here you go Bub! It is nice to be self-employed to do stuff like this for you "Gentlemen".

VP
 

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I think I was told the "T Cycle" is basically a 100th of a second period, so if you only get shocked for 1 second you get a 99% chance of living! That is why when someone gets shocked and cant let go because of muscle contraction they are sure to hit their "T Cycle" and their mortality is 0%.

The cumulative probably of a 10msec event that occurs randomly not occurring within 1 sec is:

(1 - 0.01) ^ 100 = 0.366, or a 63.4% chance that the event will occur.

If we change that to an event that *must* occur within 1 second, then the probably of that event occurring within 990msec is 99%.
 
The cumulative probably of a 10msec event that occurs randomly not occurring within 1 sec is:

(1 - 0.01) ^ 100 = 0.366, or a 63.4% chance that the event will occur.

If we change that to an event that *must* occur within 1 second, then the probably of that event occurring within 990msec is 99%.

Well whatever it is, it is gambling with your life. Since I found out about "T Cycle" I rarely if ever put myself in a situation where I may get a shock, and that is not easy being an Electrician and Electronics Tech.
VP
 
I've been killed several times. The funniest one was in physics class (I was a C/D physics student), touched two leads on the bench power supply, screaming, couldn't let go. That was across both arms, very bad, but I guess the voltage must not have been that high.

I've taken 120VAC a couple of times, but only across one hand. Hurts, but doesn't kill you too hard.
 
I've been killed several times. The funniest one was in physics class (I was a C/D physics student), touched two leads on the bench power supply, screaming, couldn't let go. That was across both arms, very bad, but I guess the voltage must not have been that high.

I've taken 120VAC a couple of times, but only across one hand. Hurts, but doesn't kill you too hard.

I got 250v AC (British domestic supply) across one hand a couple of years ago, where an electrician had left twin-and-earth curling out of a switch box. I'd been assured that the electrical consumer unit was all switched off and I was installing a door frame when I touched the wire with the back of my hand. I staggered a bit and I could taste my fillings for the rest of the afternoon, but death did not supervene. :D
 
I picked up a lamp once that had fallen down and broken in a puddle not realizing it was plugged in. I got a hella shock and the weird thing is, it like short circuited my brain so when I dropped it, I picked it right back up! Against my conscious will - my brain just re-sent the same exact signals from the previous second and picked the damn thing right back up and shocked my ass again - luckily I was able to move away from the death trap after the second time or I might still be there today picking that damn lamp up...
 
I picked up a lamp once that had fallen down and broken in a puddle not realizing it was plugged in. I got a hella shock and the weird thing is, it like short circuited my brain so when I dropped it, I picked it right back up! Against my conscious will - my brain just re-sent the same exact signals from the previous second and picked the damn thing right back up and shocked my ass again - luckily I was able to move away from the death trap after the second time or I might still be there today picking that damn lamp up...

LOL, Nightmare - like Homer Simpson reaching for the electrified Duff beer hanging over the power lines over and over again. :laughings:
 
I get shocked at my day job all the time (for the lsat 33 years). It's 60 to 90 volts AC square wave typically at around 15 to 20 amps. It will get your attention. But my best zap was back in the 70's. Where my band practiced there was a cast iron drain pipe that made a 45 about 3' from the floor which at the time looked like a seat. I was holding my electric guitar when I decided to "sit" on it. 120 volts right up my ass.
 
I've been hit with 60hz several times, but one time in the navy, I got hit with 400hz. That was a weird feeling.

Poor Heat is probably wondering what the hell happened to his thread....
 
Note that the amperage capacity of the circuit branch does not determine how much current you receive, Ohm's Law does. This gets back to my earlier statements about skin resistance.

Also, Euro people seem to be unaware that US houses also have 240V, we just don't use it to run general-purpose outlet and lighting circuits. It's reserved for high-demand appliances (stove, AC, clothes dryer, hot tub :cool:).

That means that when we are fuddling around like idiots with outlets we only take half the current (a quarter of the power!) that you do :p
 
I've been hit by 30-40k DC volts tons of times. I think that's about what runs through spark plug wires with a high power coil as what's normally found on race cars. It's only a for a few milliseconds though. It jolts the shit out of you, but isn't fatal.
 
Is this what you mean? Electroshock Therapy Treatment - ECT and how it works Nice try with the "Nascar Story"

VP

PS Ignition systems are AC, DC cannot be transformed with a coil. Furthermore, within electrical engineering, the term DC is used to refer to power systems that use only one polarity of voltage or current, and to refer to the constant, zero-frequency, or slowly varying local mean value of a voltage or current.[2] For example, the voltage across a DC voltage source is constant as is the current through a DC current source. The DC solution of an electric circuit is the solution where all voltages and currents are constant. It can be shown that any stationary voltage or current waveform can be decomposed into a sum of a DC component and a zero-mean time-varying component; the DC component is defined to be the expected value, or the average value of the voltage or current over all time.
 
I am not dead. I know you're all really concerned that I was lying in a smoldering heap on the floor next to my amp, but I was just at work.

I come back and 7 pages of stuff that I will try to sort through later. I will note that the amp is 2 prong. I am also totally with Lt Bob on the safety thing. This is really just an annoyance at this point. Kind of like licking the end of a 9 volt battery, only 4-5 times stronger. I've actually done it intentionally a few times just to confirm the experience, but it isn't so fun when it is unexpected. The house is old and the wiring is probably sketchy with a mixture of 2 and 3-prong outlets (3-prong used here). It does have circuit breakers, and they uh...appear to be in order? The guitar is really old and noisey too. Only the Roland is newer and in reasonably good shape.

Someone mentioned static electricity, and while I have noticed an abundance of that this winter, I don't think it could account for a jolt of this magnitude?

Someone mentioned a picture...there are photos of the room in the "let me see your studio" thread around page 340 something...but it would be hard to capture the actual event on film, so I drew a quick sketch to further illustrate my situation. I hope this helps:

ZAP.webp

Oh, good news - I'm still crack-free!
 
You can't really call an ignition system AC as it charges with DC then lets the field collapse once per spark. You get a bit of ringing because it's a tuned circuit, but it's more akin to the way a DC converter circuit works. It doesn't really matter when you are talking about potential across a load anyway, 20kV is gonna hurt whether AC or DC.

More than anybody probably wants to know:

Pulse Transformer Theory, Pulse Transformer Operating Principles, Pulse Transformer Theories
 
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