An automobile system is to be designed that will sound an alarm under certain conditions. The alarm is to sound if the seat belt is not fastened and the engine is running, or the lights are left on when the key is not in the ignition, or if the key is in the ignition, the engine is not running, and driver’s door is open. Determine the number of inputs and outputs and construct a truth table – Simplify using Boolean postulates, design and implement the circuit.

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.