Design a circuit with the following criteria. Assume availability of +5V and +9V power sources. i. Input signal that operates between Vin = 0V to +5V, and capable of delivering 0.9mA. ii. Output to control an external 4 ohm grounded load powered by 9V. a) Determine the current applied on the external output load? What type of circuit system do you think you need? b) Draw your designed circuit. Make sure to size passive elements, label actual P/N components, use datasheet values, etc as part of your design process. Must show your work to justify your design.