I am looking for the circuit to make speed control for the AC motor as shown in the image. Please give me a good circuit so that i can build one for my friend. Thank you.

 

I am looking for the circuit to make speed control for the AC motor as shown in the image. Please give me a good circuit so that i can build one for my friend. Thank you.

I think you can use a circuit like this.

Or, the easy way.
http://www.ebay.com/sch/i.html?_fro...nkw=universal+motor+speed+controller&_sacat=0