Mysterious Resonant Circuit

[poynt99]

You probably wanted to say DC does not "inductively couple". DC is not always used in automobiles, and DC motor driver circuit is subject to heavy overheating due to excessive quantity of transients. More advanced autos use 3phase AC motor/generator. Please if you can, give me an URL that compares transmission efficiency of DC and AC power. From what I've read, AC always won. In fact, for more advanced power lines a much higher frequency (in kilohertz range) was suggested.

say what 

yeah check your facts.

DC motor drive is not DC for starters. it's pulsed DC so it doesn't even qualify for this transmission of power discussion.

do you know antenna theory? i'm no expert either, but all conductors radiate, and they radiate better the higher you go in frequency. so for conventional transmission of power along 2 conductors, DC is obviously the best, because there is almost zero radiation. there are IR losses, but boosting it up to similar rms voltages levels (in other words HVDC) as used in AC transmission should minimize this power loss.

AC power transmission usually wins because it is easy to manage. step up and down is a snap. etc.

i'm sure vortex will correct me and add where needed here.

[Vortex1]

Thanks Poynt

Actually,I got tired of typing and hoped someone else would jump in. I agree with your explanation. HVDC has less (near zero) radiation loss but is expensive to up/downconverrt, therefore only used for the long haul and main trunks. 

By the way has everyone calibrated their scope probes at 20-30 MHz before attempting to use the scope display as an accurate indicator?..Considerable error can occur if not.

......V

[aleks]

they radiate better the higher you go in frequency.

Talking about an ideal world, eh? Radiating at 60 Hz, or even at 5kHz is pretty much problematic. I agree that in ideal conditions, highest quality line DC can potentially come out as a winner (if you are sure skin effect of higher frequencies won't make you any good).

[Vortex1]

Oh boy!  We're really in the thicket now.

[innovation_station]

I know I am.  (In the Thicket)  "Only" reason?  Yeah Right.  Ignore me. 

LOL LOL LOL!!!

now that was funny...

ist

is someone gonna post a pic of 1 aa battery powering 80 LED'S??


this can be done cuz i have done it ......