Alt-BEAM Archive

Message #10062



To: beam@sgiblab.sgi.com
From: Thomas Pilgaard ascii@hum.auc.dk
Date: Fri, 11 Feb 2000 08:01:49 -0500
Subject: RE: 74x240 question



> Just very short -
>
> Is there a difference between the HC and HCT types?
>
> Thanks
>
> Thomas
>
> > -----Original Message-----
> > From: owner-beam@sgiblab.sgi.com [mailto:owner-beam@sgiblab.sgi.com]On
> > Behalf Of David Perry
> > Sent: Friday, February 11, 2000 11:36 AM
> > To: beam@sgiblab.sgi.com
> > Subject: Re: 74x240 question
> >
> >
> > hmm, my beam ant and head (old motor) both ran pager motors fine
> > - what are
> > you using for a pwer source?
> >
> > david
> >
> > -----Original Message-----
> > From: Ben Hitchcock
> > To: beam
> > Date: Friday, 11 February 2000 2:57
> > Subject: 74x240 question
> >
> >
> > >All,
> > >
> > >I have been experimenting with a 74HC240, and I can't get the
> > chip to drive
> > >a pager motor directly even with three outputs ganged together.
> > >
> > >I've seen this done with 74AC240, I was just wondering if anyone had
done
> > >this with a 74HC240 at all?
> > >
> > >I like HC because of the low current consumption (I'm making a
> > photovore).
> > >How does the current consumption of AC compare to HC? I guess
> > I'll have to
> > >use driver transistors anyway, because Dick Smith doesn't stock any AC
> > >chips.
> > >
> > >I noticed in wilf's 240 uCore schematic that he used HC, which is why I
> > >thought that I might be able to use pager motors with two
> > outputs ganged up
> > >together.
> > >
> > >Any ideas?
> > >
> > >thanks,
> > >Ben
> >
> >
>

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