hi there i am quite reforumlating this into demorgans law thanks in advance (All INVERTED) (a inverted) (b inverted) (c inverted) (none inverted) - - A.B.C + A.B.C + A.B.C + A.B.C thanks its for a 3 input alarm. If 2 or more inputs and on then the output is on thanks ed
[attachmentid=1021] I'm Assuming this is what you want whenever there's 2 input on, output is high. [attachmentid=1023] This is the answer I have for you, just learned in my class 2 days ago.
Here's an explanation on how I got the answer: [attachmentid=1024] This is call K-Mapping which is covered in allaboutcircuits in Digital section. [attachmentid=1025] This is the output that you wanted. I place a 1 on 011,101,110, and 111. Then I had them all grouped up accordingly in pairs. So now we have 3 pairs. From there the answer is just simply: [attachmentid=1026] Lookup K-Mapping in Boulean Algebra in Digital.