Homer J Simpson said:
Most people know a gun will kill them. Not as many know a sign transformer
will do this as well.
The fact that he's confused about what a transformer will transform is a
red flag that he is in the unknowing group.
You wanna take a chance on that?
I asked him a basic question and I warned him of the danger. You'd have
done better to mind your own business since your knowledge is so slim.
Oh!! Great come back. You asked him a question... did he ask for a question
to his question or to answer his question? If you know so much about this
shit then surely you could supply more information. Your question about how
he will convert DC to AC shows just how ignorant you are... Your trying to
act like your intelligent by misdirection. The crux of the matter is not
that how he will get AC from DC(which I assume he will do by an inverter
like everyone else) EXACTLY what he asked.
Unlike you I do not know the true answer so I did not respond. I wouldn't
want to give him bad advice. Maybe you should take that advice instead of
trying to act like you know something about something you don't.
My answer would be to add about 100kohms in series with the cap to generate
a peak instantaneous current of V/R ~= 2k/100k A = 1/50 A. While this is
over is rated max of 10mA it is only 10mA above it and will die down to 7%
of that within ~5 RC's. For his application this might be to long. He
mentions that it is for a pulsed laser but how long between each pulse does
he need. How big is the cap? In anycase he could work down from the 100kOhm
resistor to increase the charge rate. Although having a resistor of 1ohm
produces an instantaneous peak current in the secondary of about 2000 A and
that means its over 4M in the primary. I'm sure that he will definitely not
get this out. But even if it pulls just 10 amps from the 12VDC supply it
could eventually cause problems. (depending on how fast and how many times
it is pulsed) Obviously there will be a saturation point that will limit the
peak inverse current and most devices can handle a substantially higher peak
inverse current but I have no specific answers.
But unlike you have I have no practical experience with the subject so I did
not answer... You also obviously have no practical experience but answered
with nonsensical questions trying to act like you know something that you
don't(which you do a lot of).
I mean, come up... WTF is up with "How will you convert DC to AC?"??? WTF do
you think you can ask such stupid questions. You are assuming the guy is a
total idiot... and this really means you are the idiot. He did not ask
anything about that and you should assume that he as a little bit of a clue
what he is doing. Now maybe it is the case he will hook up the 12VDC supply
directly to the sign transformer and it won't work... GUESS THE **** WHAT???
YOU KNOW THEY MAKE 12VAC POWER SUPPLIES TOO? Your fucking question is moot
and just a waste of time. If he does have that problem he will post back and
say it doesn't work and then someone will solve that problem very quickly
and he will just have to run to wal-mart and by a 12VAC adapter or tear out
the rectification in his 12VDC adaptor.
Now instead of that bs you should have tried to answer his real problem but
no, since you have no clue you misdirect like a magician. A magician has no
real magical powers so they pretend. You are nothing but an intellectual
magician. I see your BS all the time in this NG and you do more harm than
good and I think its time someone pointed it out. Surely though there will
be those that will jump on me because they too are intellectual magicians
and everyone knows you guys stick together.
Also, it is true its a probably a good idea to point out that it could kill
him but if he doesn't know this already then maybe natural selection needs
to take place. Also, every time someone plugs in a device you need to warn
them they might die too. Do you know that only about 200 people a year die
from electrocution? Of those how many do you think are not electricians or
kids?
"A low-voltage (110 to 220v) 60 Hz AC traveling throughout the chest for a
fraction of a second may induce ventricular fibrillation at currents as low
as 60 to 100 mA; about 300 to 500 mA of DC are required. If the current has
a direct pathway to the heart (e.g., via a cardiac catheter or pacemaker
electrodes), much lower currents (>1 mA, AC or DC) can produce fibrillation.
Body resistance (measured in ohms/sq. cm)* is concentrated primarily in the
skin and varies directly with the skin's condition. Dry, well-keratinized,
intact skin has an average resistance of 20,000 to 30,000 ohms/sq. cm,
whereas the resistance of moist thin skin is about 500 ohms/sq. cm. "
So assuming the length of is arms to chest is ~30cm gives about
2000/(30*30k) = 2mA. Ofcourse if he's playing with the shit wet or swetting
a lot then that goes up to about 133mA.
Instead of being a moron about the dangers you should just point out that
its not safe and maybe link to a site about the dangers and some saftey
precautions. Ofcourse if he's poking around in the circuitry while its life
then maybe he deserves to get electrocuted. Its not that bad though, I've
messed around inside of life TV's and not be electrocuted. (Maybe it was a
stupid thing to do but I'm alive.)
The point is, Homer, is that if your not going to try and answer is
questions then why bother to post? I know you need to feel useful but its
just a waste. Try volunteering at something your good at like picking up
trash.