Alt-BEAM Archive

Message #05675



To: beam@sgiblab.sgi.com
From: Sean Rigter rigter@cafe.net
Date: Thu, 12 Aug 1999 19:25:47 -0700
Subject: [alt-beam] Re: LEM videos now on-line.



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Richard Piotter wrote:


Personaly, I wanted to enter, but I havn't ordered parts in the longest
time!!! Sucks! also, is there a good 245 based reverser circuit??? If
so, then maybe I can build hexapod before the robotics meeting next
Thursday at St. Paul MN.

--------------------------------------------------------------------

Here you go Richard

I designed this one specially for you. So no more excuses for not finishing
Hexapod!

The G input disables all outputs when the PNC is active high. The D input affects
only the M1 outputs by reversing the connections between Nv1 and Nv3.
A 74AC245 can drive small motors (ie BG Micro Lens motor) directly but a
74HC/HCT245 will require h-bridges where the M1/M2 motors are shown.
At +V=5V, the total supply current increases by 1mA.

enjoy

wilf


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Attachment: 245REV.gif

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5676 Thu, 12 Aug 1999 22:15:39 -0400 [alt-beam] Re: LEM videos now on-line. beam@sgiblab.sgi.com SG WOW! a whole OTHER ic chip for just a reveser?
the 74HCT240 that Ian uses on his master slave bicore
only uses one resistor and a 40 uf cap.
hmmm... looks complecated!


At 07:25 PM 8/12/99 -0700, you wrote:
>Richard Piotter wrote:
>
>
>Personaly, I wanted to enter, but I havn't ordered parts in the longest
>time!!! Sucks! also, is there a good 245 based reverser circuit??? If
>so, then maybe I can build hexapod before the robotics meeting next
>Thursday at St. Paul MN.
>
>--------------------------------------------------------------------
>
>Here you go Richard
>
>I designed this one specially for you. So no more excuses for not finishing
>Hexapod!
>
>The G input disables all outputs when the PNC is active high. The D input
affects
>only the M1 outputs by reversing the connections between Nv1 and Nv3.
>A 74AC245 can drive small motors (ie BG Micro Lens motor) directly but a
>74HC/HCT245 will require h-bridges where the M1/M2 motors are shown.
>At +V=5V, the total supply current increases by 1mA.
>
>enjoy
>
>wilf
>
>Attachment Converted: "c:\pipeplus\eudora\attach\245REV.gif"
>

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