[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: Need some capacitor help please
Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com>
Aside from the issue of the single dielectric layer being doomed to failure
for use at 15kV, and assuming that your six poly sheets are actually 5 mils
each, not microns, your formula does not take into account that except for
the outermost pair, both sides of each plate are functional. So, your
formula should be C=k*A*2/d, C in pf, A in sq inches, and d in inches. I
calculate that you will need 15 plates to achieve .013uF.
Original poster: "Philip Brinkman" <peeceebee-at-mindspring-dot-com>
I'm making a new stacked flat plate capacitor using sheets of aluminum foil
7.5"x9" trying to get 0.013 microfarads. Using the equation C=kA/d (k = 2
polyethyline) . I get 3.25 sq. meters, or 74 foil sheets, does this sound
right? My last capacitor had only 30 sheets. I'm using 6 layers of 5 micron
poly plastic between the sheets of aluminum. Thanks, Phil B.