Alt-BEAM Archive
Message #00913
To: beam beam@corp.sgi.com
From: Richard Piotter richfile@rconnect.com
Date: Wed, 24 Feb 1999 07:41:48 -0600
Subject: [alt-beam] Re: what's 'strobe'
Switching uses power. In an average CMOS (I know this for sure), there is a
point part way through the switching where the FETs are both on (Complimentary
Metal Oxide Semiconductor (using field effect transistors paired up)). When both
EMOSFETs go on, they essentialy are the equivalent of tying a small resistor
from (+) to (-), effectively draining a little power. The more you switch such a
strobe, the more energy it's going to draw, simply by the process of switching.
Important consideration there. Good luck.
dennison wrote:
>
> Exactly! Using another bicore lets say, you could 'strobe' the enable line
> for the 74xx245. This was you would in effect have PWM for the motors you
> drive. So yep, your right. This can be used to change the speed of motors
> depending on lets say the light level.
>
> dennison
>
> >This is a little question for Dennison:
> >
> >In your e-mail of 17 feb (walker with reverse in one chip; I deleted it so
> >I can't copy the text in this message) you wrote something like:
> >
> >'strobe' the enable inputs of a 74x245.
> >
> >Do you mean something like PWM by means of an extra bicore with
> >photodiodes, with a relatively high frequency?
> >
> >Sorry for my lack of knowledge of the English language.
> >
> >
> >Wouter Brok
> >
> >
--
Richard Piotter
richfile@rconnect.com
The Richfiles Robotics & TI web page:
http://members.xoom.com/richfiles
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