Designing a small scoreboard need some help. - Electronic Circuits Projects Diagrams Free

czwalga · 21st March 2006, 04:24 PM

Alright... first off i'm a junior in electrical engineering and this is my first post.

Anyways, i'm trying to build a small scoreboard with 7 segment display logic. This has to be powered on batteries which i'm still figuring out if its feasible depending on how many LED's i use.

The problem i'm encountering is... I have something similar to this.

However in place of each LED segment I would like to replace it with maybe 12 or so LED's. In theory, if just put them all in series they would light up, but the voltages would be very low. I'm not positive with the question i'm trying to ask, but is there anyway I could run the logic through, so say segment A turns on. AND the A signal along with something that will bump up the voltage to power more LED's?

Sorry for the poor wording and thanks for the help.

21st March 2006, 06:08 PM

There are several ways you could do this... Maybe a demultiplexer chip like the 74ls154? Maybe just a transistor driver? What exactly are you trying to do?

czwalga · 21st March 2006, 08:00 PM

I'm trying to make a scoreboard... to count from 0-9. I would like it to beable to run off of battery power with a decent amount of life to it. I would like the 7 segment display to be around 10x6 inches. Therefore I would just use a good amount of LED's for each segment of the display.

**Nigel Goodwin** · 22nd March 2006, 09:42 AM

Quote:

Originally Posted by czwalga

I'm trying to make a scoreboard... to count from 0-9. I would like it to beable to run off of battery power with a decent amount of life to it. I would like the 7 segment display to be around 10x6 inches. Therefore I would just use a good amount of LED's for each segment of the display.

How large a battery are you wanting to use?.

William At MyBlueRoom · 22nd March 2006, 05:11 PM

Are you looking for something like this?

http://www.futurlec.com/DisplayBoards.shtml

Easy to wire if you use an ULN2803 to drive the beast.

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21st March 2006, 04:24 PM	(permalink)
czwalga	Designing a small scoreboard need some help. Alright... first off i'm a junior in electrical engineering and this is my first post. Anyways, i'm trying to build a small scoreboard with 7 segment display logic. This has to be powered on batteries which i'm still figuring out if its feasible depending on how many LED's i use. The problem i'm encountering is... I have something similar to this. However in place of each LED segment I would like to replace it with maybe 12 or so LED's. In theory, if just put them all in series they would light up, but the voltages would be very low. I'm not positive with the question i'm trying to ask, but is there anyway I could run the logic through, so say segment A turns on. AND the A signal along with something that will bump up the voltage to power more LED's? Sorry for the poor wording and thanks for the help.

21st March 2006, 06:08 PM	(permalink)
hyedenny	There are several ways you could do this... Maybe a demultiplexer chip like the 74ls154? Maybe just a transistor driver? What exactly are you trying to do?

21st March 2006, 08:00 PM	(permalink)
czwalga	I'm trying to make a scoreboard... to count from 0-9. I would like it to beable to run off of battery power with a decent amount of life to it. I would like the 7 segment display to be around 10x6 inches. Therefore I would just use a good amount of LED's for each segment of the display.