How to make an automatic redstone dropper!

Take your 2 Cobblestone and place them 8 blocks from each other

Next take the 7 Powered Rails and the 2 Detector Rails. Place the 2 Detector Rails on one side and fill in the rest with Powered Rails

Next, you need to delete the 1 Detector Rail and 1 Powered Rail on the top pf the Cobblestone block and then replace it with another Cobblestone Block

After that dig a hole and put a Redstone Torch under one of the Powered Rails to activate all rails

Get your 7 Redstone and make this shape. Make sure your Redstone is on the side with the Detector Rail

Next put your Dropper next to the end piece of the Redstone

Then you can fill up your dropper with whatever you want! I just picked chicken for it

Next take your Minecart and place it on the Powered Rails

Last of all, your Minecart will hit the Detector Rail which will signal the Redstone to make the Dropper spit out what is has in it

Enjoy your Automatic Redstone Dropper! :)