Hi Guys, I am building a circuit that measures vacuum and displays it on a LED bargraph and was wondering if anybody has any experience with the LM3914 led driver IC, specifically, building displays with multiples of 10 led's. I have the data sheet and have built a 30 led display in dot mode, but I may need to go to either 40 or 50 led display to improve resolution but cannot find any info on what is needed so it could be scaled correctly. The data sheet has a lineararity circuit, which I thought would be satisfactory for using as span adjustment, but in hind sight, am not so sure. This is designed to be set and left. I want something that can be adjusted as needed. I hope I have given you enough info for you to help. Stephen
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18 years ago