On Tuesday, February 21, 2012 04:30:03 PM gene heskett did opine: > On Tuesday, February 21, 2012 12:46:48 PM Jon Elson did opine: > > gene heskett wrote: > > > I believe that may be the maximum self destruction voltage, assuming > > > sufficient is available to reach that. At my dvm's diode range, I > > > checked 6 of them, 3 had never seen power, and they all read a > > > couple of millivolts from .989 volts forward, and with nearly 21 ma > > > now flowing its just a few millivolts above 1.24 volts. > > > > OHHHH! These are IR LEDs, which have a lower forward voltage than > > visible light > > LEDs. Those voltages sound right to me. > > > > > Working from one of those 8 ounce bags of 5 or 10 each tape bound > > > 1/4th watt R's the shack has peddled for years, I spotted the 150's > > > thru the bag, but when my hand came back out of the bag, it had > > > 150k's in it, third strip a pale yellow. So, swapping them out, and > > > they actually read 147.7 ohms this time, I now have 3.098 volts > > > across the resistor in series with each LED, and the led voltage is > > > showing at about 1.24volts for all 3 of them. So now I have > > > 3.098/147.7= 0.0209 amps thru each one, and they switch as expected > > > when the slot is blocked. > > > > Ah, that makes complete sense.
Quick test this afternoon, duty cycle sucks, need MUCH narrower slots. Since I don't have anything narrower for bits that will cut that brass, I believe I will make another identical brass wheel and mount it slightly out of time to narrow the slot, there is room for it in the opto's. 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) My web page: <http://coyoteden.dyndns-free.com:85/gene> You could live a better life, if you had a better mind and a better body. ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
