My lecturer broke his hip and the stand in is struggling. I am stuck with this coursework and am pretty desperate to get this finished. I need to build a safety circuit using NOR gates. It is short and probably easy for someone with knowledge of circuits any help will be appreciated. Question A powered guillotine uses a motor to position the cutter. The cutter must not operate while the motor is running. There is a guard which must be closed and locked before the cutter can operate but there is a maintenance facility which will allow the cutter to operate with the motor stopped but the guard open. A traffic light system must be incorporated to show when the Guillotine is unsafe (red), safe (green) and when in maintenance mode (amber). The guillotine can only operate once when in maintenance mode. Draw the Karno map and design the safety circuit using two input NOR gates (use as many as you require). If each gate has a MTTF 1526173, calculate the MTBF for your circuit (in hours). How could you redesign the circuit for an improved MTBF? How could you achieve a MTBF of 1 × 109 hours? What will the reliability be after 5 years? (Show the calculations).