On Friday 14 March 2014 03:53:45 Andy Pugh did opine: > > On 14 Mar 2014, at 06:21, Gene Heskett <[email protected]> wrote: > > > > Which is the correct assumption? > > It doesn't use reset AFAIK. > It generates a 50% square wave or it doesn't. Depending in accumulator. > Thanks Andy. I had in mind building a charge pump, but then it just occurred to me that if that things 10 volt supply can't even run a sparkfun opto kit, there obviously is not power enough to run a charge pump either. I do have an isolated supply strong enough to do that but I'd have to fire up eagle & design a whole new C-41 sized board to do it.
Charge pumps can be 1% linear if done right back in the late 50's when I built a tach for my 52 mopar hemi-head, then used it for a speedometer for several years, till I'd gotten all the goodie out of its 352 CID hemi. That took most of 140k miles because the first thing I did was put a new fangled paper air cleaner on it. Out on the hiway, it was 30 mph per thousand rpm in high + OD, nailed to the firewall running across South Dakota left to right or vice versa, it could sit at 3300 revs till it was out of gas, which because even at that speed it got right at 20 mpg=about 400 miles on a tank at might as well be 100 mph. I have had only 2 vehicles in my 65 years behind the wheel that could do that, both of them late 40, early 50 models. The other was a 49 Nash Ambassador. That engine was heavily detuned but the stuff was all there. Double sprung, deeply tuliped valves, mushroom tappet heads a good 2.25" in diameter, a square lobed camshaft of about 270 degree duration. It could actually breath if the cam timing was set a tooth late. When I say breath, I mean a good blip of the throttle would send the tach north of 7000 revs, and a block long run in low+OD would hit 8 & break ever piston ring in it, well over 4000 fps at the ring groove. So that killed that car, but it was just as well, it didn't have brakes enough to stop a little red wagon. But it sure was a "Concealed weapon" out on the road while it lasted. Easily outrunning anything but a Duntov Chevy or a Motorola radio at the time. But the Duntov was getting 4 mpg running that hard while I was getting about 19 mpg. :) Most of my quicker cars have been concealed weapons. Didn't look the part at all. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
