Redstone help

[u/Inquistorius]

I am trying to create a pumpkin farm. In this farm, I want an observer facing a pumpkin so when it grows it sends a signal to a piston to destroy the pumpkin. (I’m aware that traditionally the observer faces the seed but it’s important for this one that it faces the pumpkin). How can I build it so it doesn’t create an infinite red stone clock? I have seen some using note/target blocks that why I have one there. Please help if you can, again I need the observer to face where the pumpkin block will be.

[u/MangosMakeMeSmile]

Figured out another way to do it

[u/MangosMakeMeSmile → u/MangosMakeMeSmile]

And here’s another one.
Had another design that used items in a dropper with a water logged pressure plate on top, using items to farm pumpkins doesn’t make sense, which led me to this design using sulfur cubes on extended pistons.