Originally posted by n9xv@Jan 22 2005, 11:26 AM
Elaborate a bit :unsure:
Originally posted by n9xv@Jan 23 2005, 09:25 AM
Ok, now I'am with you. Its been a while since I came accross that topic. I've heard of people using VERY powerful magnets around the meter to do that too!
I'll check out the schematic online, now I'am really curious.
i figured about doubling the caps voltage and resistor to enable it to handle 240 volt, but from what you say, .. treble the resistance might be best.Originally posted by n9xv@Jan 26 2005, 02:20 AM
I did find that circuit on the web. It sounds like the one your talking about. They said it was ment to be used at night or low current activity times. But even at that, it seems like the greatest concern is the resistor. The showed about 20-30-Ohms.
A couple of amps through a 25-Ohm resistor is 100-Watts of heat dissapation. You would want a resistor of at least twice that rating to be safe. I dont know if thats a circuit I would feel comfortable enough to leave in place while I'am asleep!
The RC time constant works out to be about twice the periode of the 60-Hz AC power frequency. The period at 60-Hz is 16-mS. They claim that at some point in a low current draw situation that you can make the power meter go backwards!
Well, lets just say they have'nt convenced me yet! I dont see why you could'nt do the same thing with an inductor. That seem to be alot safer anyway! That would throw the voltage out of phase with the current as well.
An interesting proposition to say the least! - - - To be continued B)
by Ikimi .O
by Ikimi .O