Может эта схема подойдёт? https://img.alicdn.com/imgextra/i4/1804731589/TB2y8xajpXXXXaxXXXXXXXXXXXX_!!1804731589.jpg
http://kupinatao.com/pages/item_detail.aspx?itemid=jM1cU%2f1xsoE1yi6dtD62DA%3d%3d&nick=%E5%90%B3%E6%98%8E%E6%AD%A62013
https://img.alicdn …ajpXXXXaxXXXXXXXXXXXX_!!1804731589.jpg