Test: Interfacing Digital To Analog Converters, Stepper Motor Interfacing And Control Of High Power Devices Using 8255 - Computer Science Engineering (CSE) MCQ

DAC is used in digitally controlled gains, motor speed controls and programmable gain amplifiers.

Zener is connected between OUT1 and OUT2 pins of AD7523 to save from negative transients.

An operational amplifier is used as a current-to-voltage converter to convert current output to output voltage and also provides additional driving capability to the DAC.

 DAC 0800 has a settling time of 100 milliseconds.

Stepper motor employs rotation of its shaft in terms of steps, rather than continuous rotation as in case of AC or DC motors.

The internal schematic of a typical stepper motor has 4 windings.

The number of pulses required for one complete rotation of the shaft of the stepper motor is equal to the number of internal teeth on its rotor.

In this scheme, the windings are applied with the required voltage pulses, in a cyclic fashion.

 In early days, the firing angles were controlled by pulse generating circuits like relaxation oscillators and now, they are accurately fired using a microprocessor.

Any switching component of a high power circuit may be sufficient to damage the microprocessor system. So, to protect the low power circuit isolation transformers are used. They are also used if isolation is necessary.