Re: [CAD_CAM_EDM_DRO] Re: not working!

JanRwl@... wrote:

> In a message dated 05-Aug-00 12:31:13 Central Daylight Time,
> jmelson@... writes:
>
> > but can sink a good deal of current, at least 10 mA, <
>
> True, if a relatively-new PC, right? I mean, some "old" PC's may have
> been
> using 74LS374's to drive the LPT-1, and those were not "very good" at
> sinking
> even 10 mA, and keeping the voltage below 0.8 VDC! One thing THIS
> ignernt
> ol' fool has taught himself over the decades is, "If it seems easy,
> breadboard it; measure it, worst-case; choose components for at least
> twice
> that dissipation/voltage-drop; and pray to the diety of your choice!
> Repeat
> twice. If "OK'" all three times, then, it MIGHT work "in the real
> world".

Yes, for those of us with oscilloscopes, DVMs and lots of small parts to

tinker with, this is easy stuff. But for somebody who has to go to the
Radio Shack to get one resistor, and whose best electrical instrument
is an old VOM it might not be so easy to do.

Jon