Try this: http://imgur.com/a/CsnUl#0
It's also worth noting that none of the pistons for the circuitry are sticky as well. The lone piston facing upwards is pushing a sand block, btw, so that it may fall and reset once unpowered.
Edit: Fail, you can make it a bit faster by replacing the torch tower with the same upside down slab line from the opposite side. It can also be much faster if you invert the input, but I don't feel it's worth the extra space it'd take up.