Author Topic: BCD Complement switch project ideas?  (Read 815 times)

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Offline rpetithoTopic starter

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BCD Complement switch project ideas?
« on: November 11, 2019, 05:31:12 pm »
All I ended up with 12 of these. All are 0-9 BCD complement. Any project ideas?

870488-0

-Bob
 

Offline SeoulBigChris

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Re: BCD Complement switch project ideas?
« Reply #1 on: November 12, 2019, 11:04:58 am »
Back in the early 90s I designed a digital frequency synthesizer add-on to an existing product. The user could dial in frequency using thumbwheel switches almost identical to these.  This system didn't have a computer, and I ended up converting the BCD digits to the binary control word needed by the synthesizer using a series of EEPROMs - one bank to do BCD to decimal, and another to do a reciprocal operation. 

As for projects, how about using them to set a clock? Or build an old-fashioned front panel to a modern ARM embedded board.

-Chris
 
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Online Yansi

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Re: BCD Complement switch project ideas?
« Reply #2 on: November 12, 2019, 11:49:22 am »
There are some interesting ICs for binary/BCD conversion, just as this one:

http://www.utm.edu/staff/leeb/DM74185.pdf
 

Offline shved

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Re: BCD Complement switch project ideas?
« Reply #3 on: December 17, 2019, 05:07:02 pm »
You can use it with 74ls42 or similar BCD chip.
 


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