Re: [CAD_CAM_EDM_DRO] 3.3v to 5v Parallel Port conversion

Jan, Jon, Robert (Quale and Campbell),

Thanks for all of your suggestions. I suspected that it might be a fairly
simple circuit (or not so simple, with the opto-isolation and whiz bang
stuff of the Mach2 Breakout board), but figured I needed to verify. After
finishing the mechanical portion of my mill conversion, where a certain
amount of recklessness with welder, dead blow and angle grinder served me
well, I taught myself a tough lesson in the delicacy of electronics when I
executed an unfortunate Xylotex board. As I await a replacement, I'm trying
to double check EVERYTHING. Thanks again.

Jay Arnold

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, September 17, 2003 6:07 PM
Subject: Re: [CAD_CAM_EDM_DRO] 3.3v to 5v Parallel Port conversion


> Jay:
>
> I assume you have a source for +5VDC, and know which is "ground", and such
> IMPORTANT trivia. Now all you need is a 74HCT541 octal buffer. That is
an
> 18-pin 5V IC which will happily take inputs as low as 2.4 VDC, and just as
happily
> output probably at least 4.75 VDC, if your supply is 5.0 VDC, into a 300
ohm
> load. It might be ideal for you to add eight 10K resistors, one to each
> input, tying the other ends together to Vcc, to insure that IC's inputs
never
> "float" (BAD for CMOS stuff, particulary up in the dry, cold winters!)
>
> If you are not into making your own "special" PCB's, Radio Shack sells
some
> nifty small stuff which have solder-pads which make cobbling "made-up"
> breadboards for such as this reasonably
> straightforward.
>
> Have fun, and work carefully, and it will work if you don't klutz
somewhere!
> Jan Rowland
>
>
> [Non-text portions of this message have been removed]
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
> Moderator: pentam@... indigo_red@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
>