Watch eBay for a small static inverter. I got an Abbott one for under $50. It takes 28 VDC and puts out 115VAC 400 Hz.
-John =================== > How about one of those 2kw car stereo amps with a 555 input tone ? > > --- On Wed, 3/27/13, Bill Ezell <[email protected]> wrote: > > > From: Bill Ezell <[email protected]> > Subject: [time-nuts] OT - DC-10 gyros > To: [email protected] > Date: Wednesday, March 27, 2013, 1:40 PM > > > Well, I can come up with something topical, read on. :) > > I saw a 'Bendix yaw-rate gyro' on FleaBay recently for $14.50. Of course, > I had to buy it. > > What I got was the yaw-rate gyro package from a Northwest Airlines DC-10 > that was stripped for parts around 2000. The gyro included the pull tag > with tail number, the license number of the A&P mechanic that pulled it, > and some other cool stuff. > > What it turned out to really be is two gyros with two sets of electronics > in one box about 6" x 2" x 5" box, all vintage '80s or so. Even better, > it's a strapdown system. The actual gyro wheel is about the size of your > thumbnail. I've just started tracing things out, and I've gotten the gyros > to spin up. I really love mechanical gyros for some reason, too bad > there's not a gyro-nuts group. I'm going to have great fun getting the > package traced out and running. > > So, to be a bit more topical, the package of course needs 28V 400Hz for > the gyros, 28VDC for something, and +/-15V for most of the electronics. > > Question - anyone figured out some clever solution for the 400Hz power? I > faked it with a signal generator and power amp, but that's a bit bulky. > I'm thinking I'll use one of the class-D amp ICs and a simple op-amp > phase-shift sine generator. > > Topical in a more abstract way, strapdown systems really are very > interesting. They require precise integration of the rate output over time > to derive velocity and position, and really weren't practical until the > 70's when small enough computers existed to do the requisite > calculations. (I worked on the nav system for the Trident missile back in > my Draper Labs days). > > -- Bill Ezell > ---- > They said 'Windows or better' > so I used Linux. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
