Hi Nigel,
I like your idea, but it won't do what I need it to do. In my original post, I asked for a single NAND gate LED flasher. I had only one gate left and I didn't want to have to use a whole chip just for a flasher. (I know, I could just use a flashing LED--but that's not the point!) :wink: Anyway, I can't change the existing logic as it is used for other things. In a nutshell, what I want is when I get two logic-high levels at the existing AND gate, it drives the last NAND gate as a 1-2Hz LED flasher. Got anything in your bag of tricks?