droppers are nolonger triggered by a redstone update the same way dispensers are
it use to be that i could power a dropper with a lever, then run pulsing red stone circuit behind it and every time it pulsed the dropper would drop an item.

also i set my droppers up ontop of each other and ran repeaters into every other one, but when i power it the dropper that is directly powered by the repeater does not work no matter how many times i try to give it power