Alt-BEAM Archive
Message #02061
To: beam@corp.sgi.com
From: David David@quidan.demon.co.uk
Date: Tue, 6 Apr 1999 15:19:13 -0700
Subject: Bicore using 74xx240
> I've tried again to make a bicore out of a 74LS240 and it just won't
> work.
> What's more is that if I use unequal resistors the two LED's do
> pulse, but one faster than the other, using equal resistors the LED's
> do not pulse.
> Here is the circuit diagram I am using, I wonder if you can help me
> out:
>
>
> ____________________________
> | __________________________|__
> | | | |
> | | |\ | |
> | -||--o---------| >o--------o- |
> | | |/ |
> | l |
> | | | |
> | | | |
> | T |
> | | |
> | -o- GND |
> | |
> | |\ |
> ---||--o---------| >o-----------o-----
> | |/
> l
> | |
> | |
> T
> |
> -o- GND
>
>
> All of the enables are connected to GND. The resistors are 1M
> and the capacitors are all .22uF.
>
> --
> David Welch
>
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