On Thu, Jun 04, 2009 at 01:27:42PM -0400, Jim Lynch wrote: > > So to get a 6 ohm resistor at 18 watts you'd take 4 of these in series > in parallel with 4 more in series. That would give you 6 ohms at 20 > watts. 3 x 4 = 12 in each leg and two of those in parallel would be 6 > ohms. Resistors in parallel add power so you'd have 10 watts x 2, or 20 > watts. > > Seems cheap enough to me.
It really isn't about the price, Jim; it's about the amount of involvement necessary. I.e., I'd have to sit here in Charleston and wait for the resistors to come in; then, I'd have to put it all together. Since that huge clump of resistors won't fit into the AP housing, I'd now have to cut the wire to the drive unit, insert the resistors - whoops, all that is going to be sitting out in salt air; better build a case for it. While I'm at it, those resistors shouldn't just sit there in the case - they'll couple all that heat into the closed space and cook themselves, so I guess I'd better rig a heat sink inside the case to mount them on. Oh yeah... I'll need some kind of external connectors on the box, too - maybe a terminal strip. I'll also need to find a good place for mounting this thing - where the heck can I do that along the route of the wire? - and make sure it doesn't get in the way of anything else, or jab anyone in the back when they sit down. Oh, and I should probably make the case waterproof - don't want those solder joints to oxidize! - and where the heck can I buy a suitable case, heat sink, heat transfer compound, terminal strip, and suitable screws? Maybe Radio Shack... yeah, I'll get a taxi... maybe stop by Home Depot if RS doesn't have everything I need... I have little doubt that Pending would be born right here in Charleston if I started down that path. Not what we're aiming for. :) -- * Ben Okopnik * Editor-in-Chief, Linux Gazette * http://LinuxGazette.NET * _______________________________________________ Liveaboard mailing list Liveaboard@liveaboardnow.org To adjust your membership settings over the web http://www.liveaboardnow.org/mailman/listinfo/liveaboard To subscribe send an email to liveaboard-j...@liveaboardnow.org To unsubscribe send an email to liveaboard-le...@liveaboardnow.org The archives are at http://www.liveaboardnow.org/pipermail/liveaboard/ To search the archives http://www.mail-archive.com/liveaboard@liveaboardnow.org The Mailman Users Guide can be found here http://www.gnu.org/software/mailman/mailman-member/index.html
