Re: WTF ! MIT to eliminate power cords ?

In article <466A2083.9E968E29@xxxxxxxxxxxxx>,
mike.terrell@xxxxxxxxxxxxx says...
krw wrote:

In article <466A153B.2695F751@xxxxxxxxxxxxx>,
mike.terrell@xxxxxxxxxxxxx says...
krw wrote:

In article <46698395.4E85CE@xxxxxxxxxxxxx>,
mike.terrell@xxxxxxxxxxxxx says...
Joel Kolstad wrote:

"Jim Thompson" <To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx> wrote in
message news:tgpi631k3g8ttvpqs58rkehh804vmpovlc@xxxxxxxxxx
My apologies, MIT has gone Demoncrat on us. This deviation from the
true MIT "nuts and bolts" engineering was a big contributor to my
deciding to retire from the Educational Council in April :-(

No, no Jim, you should *encourage* this trend -- more consulting work for you
in the future! :-)

There was a guy at the last Oregon State University engineering expo who had,
as his project... an... 8:1 multiplexer... built using... TTL logic.
Oooooohhhh! Aaaahhhh!

At least he didn't use a microcontroller?


Now if it was a TTL Analog Multiplexer it would have been
interesting.

Not a problem. Use a TTL OC output to tie inputs of an opamp summer
to ground:

___ ___ ___
A1 o--|___|-------.-|___|------o-----|___|- -------|
| | |
___ | ___ | |\| |
A2 o--|___|- -o---)-|___|------o-----|-\ |
| | | >- --------|-----
| | ---|+/
| | | |/|
__ | | |
Inh1 -| \ | | o
| )o--} GND
-|__/ |
|
__ |
Inh2 -| \ |
| )o------
-|__/
(created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de)

It's not a great analog switch, but it works.

--
Keith



You are ignoring that a typical analog switch is bi-directional.

Ok, drop the opamp.

--
Keith


Now you are ignoring the 'on resistance'.

I said it wasn't great. I just said it could be done. ;-)

--
Keith
.

Relevant Pages

  • Re: WTF ! MIT to eliminate power cords ?
    ... There was a guy at the last Oregon State University engineering expo who had, ... Use a TTL OC output to tie inputs of an opamp summer ... You are ignoring that a typical analog switch is bi-directional. ...
    (sci.electronics.design)
  • Re: WTF ! MIT to eliminate power cords ?
    ... There was a guy at the last Oregon State University engineering expo who had, ... Now if it was a TTL Analog Multiplexer it would have been ... Use a TTL OC output to tie inputs of an opamp summer ... You are ignoring that a typical analog switch is bi-directional. ...
    (sci.electronics.design)
  • Re: WTF ! MIT to eliminate power cords ?
    ... deciding to retire from the Educational Council in April :-( ... There was a guy at the last Oregon State University engineering expo who had, ... Now if it was a TTL Analog Multiplexer it would have been ... You are ignoring that a typical analog switch is bi-directional. ...
    (sci.electronics.design)
  • Re: So why is this person buying P2K computers if he already has his own emulator?
    ... Ignoring the number of words for a moment, wouldn't reverse ... engineering require the use of engineers? ...
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