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Re: super cheap capacitance/inductance Tesla coil metering



Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Dmitry,

The current to the streamer tends to be made of high frequencies along with the streamer's fundamental frequency current. So you need to measure with a high bandwidth like 2Mhz to "see" much. Putting a small scope on the terminal does work, but is fairly risky

http://hot-streamer.com/temp/DaveTest-82.jpg

http://hot-streamer.com/temp/DaveTest-83.jpg

Very cheap meters are pretty common though:

http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=92020

so the voltage to isolated digital readout is pretty easy ;-)

But one either needs to do an RMS conversion, peak detector, or something to get useful information from the complex real current signal.

http://hot-streamer.com/temp/DaveTest-84.jpg

Cheers,

        Terry


At 10:02 AM 12/11/2005, you wrote:

Hello Terry.

how about small, battery powered, light-weight, can be placed on top
of the toroid and wired between the toroid surface and breakpoint,
optocoupled (NOT fiber optic) current probe? something like this:

http://www.pupman.com/listarchives/2002/August/msg01391.html

"You need to make up a Voltage-to-Frequency converter for the sending
end and a Frequency-to-Voltage converter for the receiving end.  The
circuits are pretty simple and a whole slew of manufacturers make ICs
for that purpose."

substitute "voltage" by "current". if i only live near you i`d even
buy such thing from you. seriously.

i think such device will be much more useful than el cheapo primitive
lc meter. coz anybody can tune the coil "for maximum smoke" - you
never need any equipment at all to do that.


>>> > Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>
>>> >
>>> > Hi All,
>>> >
>>> > Making an oscillator with a 555 timer to measure capacitance is on my
>>> > mind.  I "think" it could do inductance easily too...
>>> >
>>> > I was thinking of a trivial LM555C timer circuit powered by a 9V
>>> > battery

-----
I have never heard of a coiler blowing up a pole pig!  A pole pig can
easily blow up a coiler, however.  You could also be hit by a bus though.
27-08-96 (c) Richard Hull, TCBOR