Re: Input power measurement

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Stephen Conner by way of Terry Fritz <teslalist-at-qwest-dot-net>" <steve-at-scopeboy-dot-com>

Hi guys,

As part of my research at university I designed a true RMS wattmeter that 
uses your computer soundcard as an input device. The only hardware you need 
is a current transformer, a voltage transformer, a couple of trimpots, a 
mini-jack lead, and a good deal of courage. The voltage signal gets fed in 
the left channel, the current goes in the right, and a piece of software I 
wrote works out the watts, VA, power factor etc. I haven't dared to use my 
prototype with a Tesla coil because I'm worried about getting RF into the 
computer and wrecking it. However if anyone is interested I could write up 
some plans and make the software available for download.

Steve C.