Clearly OT!
Indeed electronics have come a long ways since then.
I still have my Dad's 200 w-sec strobe. Oil filled caps from Edmund
Salvage dumped to the flash tube with a thrytron. Later vintage an
electronic ignition, nice toroid 6 v to 400 v converter and a decent SCR
for my PV544 (pregnant roller skate). Got me a gain of about 1.5
mi/gal averaged over a year. .... and a constant current supply ... that
drove a 1:2 step up transformer to light 5 to 32 orchard heaters ( eg. 1
row ) a single person could light up a whole orchard in a few minutes,
either propane or fuel oil. I think that project only lasted a few
years. pulsed 220 drifting avout an orchard was just too dangerous.
Finally came the switch to sprinklers and orchard fans. ....
and then grey smog in the morning went away. No the old days were not
necessarily the good old days.
Dave
On 4/10/22 8:31 AM, Mark Johnsen wrote:
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
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