A fabric produces two kind of products, the product one of red color and product two of green color. Before the quality control they arrive through a conveyor belt in a random way. Through a system of image recognition a piston drives a separator that passes from position one to position two depending on the product. The conveyor belt moves relatively slow therefore several seconds pass before the separator switches position. The piston moves two switches (N/A) when it is on position one or on position two. The control system requires a variable exit voltage between 25 and 10 volts. Design a circuit that performs this function.