bigal_scorpio
Active Member
Hi to all,
I have hand built a 12 x 12 LED matrix and wondered if it was possible to use an IC that could cover all 12 connections on the common side instead of chaining maybe two 595s?
I have in my box some CD4040be ICs and since it is a 12 stage ripple counter I was thinking maybe I could use that to control either the rows or columns. I don't mind using something else to beef up the capabilities of the IC as it will be eventually driving two identical displays that will both show the same characters simultaneously. I was thinking possibly a couple of ULN2803s for each side or at worst case 12 single power transistors to drive both.
But will the 4040 do the job that is usually done by 595's. From the datasheet I can't figure out if the outputs are on one at a time or one more each cycle and whether I should source or sink for the required effect?
Any help or ideas will be much appreciated, even if the info shoots down my idea at least I will know then that I have to order some 595's. Doh!
Al
I have hand built a 12 x 12 LED matrix and wondered if it was possible to use an IC that could cover all 12 connections on the common side instead of chaining maybe two 595s?
I have in my box some CD4040be ICs and since it is a 12 stage ripple counter I was thinking maybe I could use that to control either the rows or columns. I don't mind using something else to beef up the capabilities of the IC as it will be eventually driving two identical displays that will both show the same characters simultaneously. I was thinking possibly a couple of ULN2803s for each side or at worst case 12 single power transistors to drive both.
But will the 4040 do the job that is usually done by 595's. From the datasheet I can't figure out if the outputs are on one at a time or one more each cycle and whether I should source or sink for the required effect?
Any help or ideas will be much appreciated, even if the info shoots down my idea at least I will know then that I have to order some 595's. Doh!
Al