Ingredients:

2 lbs of peanuts – Raw/unroasted work best but any will do. I strongly suggest unsalted. And no shells!

2 cups of light corn syrup – Karo is the name brand here, though off-brand works fine too. Corn syrup is not evil; it keeps the sugar playing nicely while heating!

3 cups of white granulated sugar

2 cups of water – This is used to dissolve the sugar and disappears while cooking

1 stick (8 tablespoons) of butter – I use regular salted butter, though I imagine margarine or unsalted butter works too.

3 teaspoons of baking soda – I recommend buying a fresh box to make sure it really works well! This is The Secret Ingredient that Alton Brown totally missed!

2 teaspoons of vanilla – I use “pure vanilla extract” but I guess imitation would work too.

2 teaspoons of water – Again, this suspends the baking soda and disappears instantly when you add it.
Actually the total producion line making peanut candy brittle from the raw peanut to the finished product includs 6~7 machines in the business world. 
Full Automatic Peanut Brittle Making Machine is designed for the modern candy bar and cereal bar production. Its progressive technology, reliability ,the easy of the operation and flexibility are appreciated by our customers. We can plan,layout,supply and start-up your complete bar line from the kitchen,process, through the packaging.The automatic processing line includes heating, mixing,  platen, cutting and packing. 
Peanut candy cutting machine Flow Chart:

Raw peanut--- Peanut roasting machine---Peanut peeling machine---electric sugar boiler---Mixing machine---Conveyor---Peanut bar cutting machine---Automatic pillow packing machine.
When peanut turned into a guilt-ridden indulgence akin to candy brittles,how could you resist this kind of delicacy.