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NNTP-Posting-Date: Sun, 17 Nov 2002 22:00:27 -0600
From: "David Jones"
Subject: Re: I need an 8 to 256 decoder or equivalent
Date: Sun, 17 Nov 2002 22:56:11 -0500
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thanks alot. I think that last link will help answer my question. I know a
lot of people gave me a lot of suggestions but since I just a novice I don't
understand the names of the ic's they reffered to so I have to study more
and then go back and take a look at each suggestion. that'll help me make a
more efficient or smaller circuit in the end. but for now the link will
probably help the most. thanks again
"Si Ballenger" wrote in message
> On Sat, 16 Nov 2002 17:35:54 -0500, Gary Tait
> >On Fri, 15 Nov 2002 22:54:56 -0500, "David Jones"
> > wrote:
> >>I'm trying to use an 8 bit binary input to select 1 of 256 different
> >>LEDS(I'm using leds as an example). I know there exists a 4bit input 16
> >>output decoder but I don't know how to get 256 options using it with
> >>IC's. How do I make the equivalent of an 8 to 256 decoder with the
> >>discete components? any suggestions are welcome.
> >Now reading all your posts, it seems you want to have at least 8 lines
> >on your paralell port (or even some sort of serial signal), turn on
> >and off up to 256 loads (for your agument LEDs, but could be anything.
> >If you don't want to do serial (using a micro will make it easy,
> >electronically, the code for the chip, and to send commands to the
> >chip will take work), you could use a multitude of latches and address
> >decoders select an address, and latch data to that address. It will be
> >much simpler, IMO. I can supply you with base schematics you can add
> The below links show how to control a lot of objects with the
> parallel port. The bottom link (watch fro word wrap) controls 380
> christmas lights from the parallel port.
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