BCD or Binary Coded Decimal is same as HEX only it rolls over at "9"
Thus, you have to decode 9 combinations of 4 bits. Not hard but hardware
intensive as diodes take a lot of space. You need pull-up and pull-down
resistors to
create "AND" and "OR" gates.
An elegant approach is to use a PIC micro to do the stuff you need. It costs
a dollar or two and the development environment is free.
If you need help, I can help set you up :)
If you have a FAX, I can send you a diagram for the diode decoder you want
to have :)
Alex
===================================
If we can accept the notion that GUNS are
the killers and not the people, why is it that
we can not accept the idea that CARS are
the speeders and not the drivers?
Alex, trying to understand the world around.
==================================.
----- Original Message -----
From: "Pete Smith" <n4zr@contesting.com>
To: <towertalk@contesting.com>
Sent: Friday, December 21, 2001 3:15 PM
Subject: [TowerTalk] Decoding BCD with passive circuit
>
> I'm told that this can be done with a diode matrix to power switching
> relays. Can anyone point me to a reference, preferably on the web, for a
> basic circuit? Application would be in remote antenna switching.
>
> Thanks!
>
> 73, Pete N4ZR
>
> The revised World Contest
> Station Database
> is online at www.pvrc.org
>
>
>
>
>
> AN Wireless Self Supporting Towers are now available! Windloading tables,
> foundation diagrams and charts, along with full details are now at the
> AN Wireless Web site: http://www.ANWireless.com
>
> -----
> FAQ on WWW: http://www.contesting.com/FAQ/towertalk
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>
AN Wireless Self Supporting Towers are now available! Windloading tables,
foundation diagrams and charts, along with full details are now at the
AN Wireless Web site: http://www.ANWireless.com
-----
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Submissions: towertalk@contesting.com
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