How would I create a circuit that gives an output similar to the one of a button when a block behind is powered with a lever but not when not powered?
Sebastian Wright 
Sorry about the length of the title of this question. I have a circuit where I am trying to get an output like the one of a button from an observer looking at a piece of redstone dust that is powered by a lever. This is obviously simple enough, but the catch is that I only want the observer to give an output when the redstone dust it is observing is powered on, not when it turns off. I have tried so many different ways. The time it takes the redstone dust that the observer is observing varies every time by the way. A quick reply would really be appreciated! Thank you!
11 Answer
use this redstone contraption. Also, I couldn't fully understand "The time it takes the redstone dust that the observer is observing varies every time by the way" so if you find a way to do that just connect it to this.
this is how to make it and what this does:
- do that "The time it takes the redstone dust that the observer is observing varies every time" thing
- if you know how to make an AND gate skip to # 9
- place 2 parallel repeaters with 1 block between them
- place 2 comparator facing towards each other, one on the end of each repeater
- right click both comparators
- place 1 redstone block for each comparator (the combination of signal + right clicked comparator + redstone block is 1 way to make a not gate)
- place a comparator on the block that the 2 comparators are facing and right click it
- place a redstone block for the comparator (this NOT gate can take 2 inputs and be a NAND (NOT AND) gate, also note how the repeaters do not take input from the redstone block)
- now put the observer to the input of one repeater
- put the redstone dust itself for the other input (so the observer has to give signal and the redstone must be on, therefore not sending a signal when the button goes off)
