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PostPosted: 10.10.2004 00:35 
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Junior Modder
Junior Modder

Joined: 02.10.2004 06:53
Posts: 15
Hey,

I was down at the electronics store and came upon a MAN6740 - "2 digit numeric display red c.c." I didnt know what exactly I could use it for but I thought hey, it'll be nice to have one lying around in the event that I do. So I was thinking maybe having the counter count down from its max (i think 9.9) when a trigger sets it off (perhaps someone opening the side panel or starting up the comp). any ideas how to go about doing something like this. the display has a whopping 18 pins...and i think according to the data sheet each one controls a number. I guess i'll need more parts to control this thing. but i have no clue about electronics, so if someone could help me out, i'd very much appreciate it.


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PostPosted: 10.10.2004 09:31 
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Site Admin
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Joined: 24.01.2002 10:09
Posts: 4683
Location: Finland
Datasheet is always the best place to start:
http://www.fairchildsemi.com/ds/MA/MAN6740.pdf

From there you can see the pins orders and a diagram that shows you how the segments are formed inside the module.

Some examples and tests to do with it:
http://www.play-hookey.com/digital/expe ... splay.html
http://www.ffldusoe.edu/Faculty/Denenbe ... n16-20.htm (bcd stuff in the middle of the article)
http://www.nutchip.com/progetti/counter_en.htm (4511 part for driving the display)

Find more with google by using keywords like: seven segment schematic

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