That brings back memories. The fun of being at Grandma and Grandpa's was the Popular Mechanics and Popular Science magazines I could page thru when visiting.
I remember all the pages in the back of the magazine where people were trying to sell things, I always wanted a VW Bug replica car conversion to a porsche or some old cool MB. Those pages are like today's internet advertisements, only the pages didn't do much tracking of your 'reading' history. Mark On Sun, Apr 10, 2022 at 4:55 AM Mark <wendt.m...@gmail.com> wrote: > Beat me to it. I was just about to say the exact same thing. > > What comes around goes around. > > Mark > > On 4/10/22 05:28, Gregg Eshelman via Emc-users wrote: > > In other words the person who designed that created a pulse width > modulation motor controller without calling it that. > > > > > > On Saturday, April 9, 2022, 08:18:17 PM MDT, John Dammeyer < > jo...@autoartisans.com> wrote: > > > > > > Really nothing to do with LCNC or even automation. > > > > I've been cleaning out old shelves and I have piles of Popular > Electronics Magazines. This one from December 1965 (yes, almost 57 years > old) has an article on how to improve model trains so they start slowly or > crawl rather than lurching forward requiring backing off the speed control. > > > > They call it pulse power. Using only transistors and diodes the article > describes a method of creating narrow pulses superimposed on a varying DC > voltage. One knob controls the width of the 12V pulses and the other the > amplitude of the DC mixed with the pulses. The pulses are 60Hz. > > > > Now we just buy stuff like that for way less than what the transistors > would cost. Things have come a long way. > > > > Just thought I'd share. > > John > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
