Re: [CAD_CAM_EDM_DRO] Re: Lost steps

In a message dated 8/20/00 10:24:22 PM Central Daylight Time, Ozzie@...
writes:

<< Your first two paragraphs are a bit beyond my knowledge base. I don't
know what circuits properly bypassed means >>

Sorry, I know nothing of proprietary ("store-bought") driver circuits that I
have never had in my own grubby hands.

"Bypassing" is "Electronic-speak" for [bypassing noise to ground], and the
word usually implies that CAPACITORS are connected from each power-supply
line to GROUND. Some DC power-supplies are +5VDC only, and some are such as
+5, +12, -12, and kitchen-sink, pluse "O Volts" (or "ground"). To "bypass",
say, the 5VDC, you would run a 0.1 uf. capacitor from it, generally very
close to the "load", and then directly to ground, via the shortest,
"beefiest" connection you can make (within reason! Not with #4 Kearnies,
but, say, to a "ground track" on the PCB at least 1/4" wide, etc. That is,
not a 1/64" wide "signal track" 4" long from where it last was connected to
such a "beefy" ground.)

Or, some would surely use MUCH more capacitance than that 0.1 uF! That
latter would work only to "bypass" such as "radio-noise" to ground, but if
you had, say, "electrical noise" due to motor-starting, etc., you would want
to use 10 uF or even more, and ALSO a "ceramic" or "mylar" 0.1uF, in
parallel! It's a kinda nebulous thing that lektronik-tinkerers learn with
years of cobbling PC-boards, etc! And, as you should surmise from my
grammar, here, I am NOT a wizard, and some "ol' boy" in this group with more
grey-matter between his ears should answer you, instead of dum' ol' me!!!
(But I'm happy to supply the levity!) Jan Rowland