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There is a lot of di erence between the simple world of DC and the rich dynamics of AC signals. After a brief introduction into the basics of sinusoidal signals we went and looked at ways of turning AC back into DC. The diode is our rst component that has to be inserted into a circuit in the correct direction. This is because they only conduct electricity in one direction. Except, of course, for Zener diodes. These two types of diodes give us the ability to control and limit input signals. The main focus of this chapter was the capacitor. While capacitors block direct current, they allow the electric eld to pass through and move the electrons on the other side of their dielectric. Capacitors are normally used in conjunction with resistors to make lters, through they have their uses in other types of power circuits. The RC time constant is a common thread that runs through a variety of capacitor/ resistor circuits and de nes how quickly that circuit can react to changing voltages.

= = = = = = = = = =

1. What type of electric current comes out of your wall What is the other type of current 2. What is frequency 3. What does a diode do What happens when you put one in a circuit backwards What happens if you apply more voltage to a diode that is plugged in backwards To a Zener diode 4. What are the parts of a capacitor 5. Does a capacitor conduct electric current What does a capacitor do 6. What is a common circuit using a capacitor and a resistor What is the formula that describes its behavior

Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.

brought high, the chip operates in the half-step mode. This mode doubles the resolution of the stepper motor. For instance, the motor we are using rotates the shaft 1.8 degrees per step. When operating in the half-step mode, the shaft rotates 0.9 degrees per step and the overall rotation speed [revolutions per minute (rpm)] of the shaft will be one-half of the speed of the full-step mode. If pin 10 is brought to ground, the UCN-5804 will operate in full-step mode.

An inductor is the inverse of a capacitor. Where the capacitor blocks DC and passes AC, the inductor blocks AC and passes DC. The capacitor uses the electric eld for its e ect while the inductor uses the magnetic eld. But we are getting ahead of ourselves. Magnetism is the other half of the electromagnetic eld introduced in 4. The capacitor manipulated the electric eld and now we get to play with the magnetic aspect. Magnetism seems magical in its e ects, pushing and pulling at metal from a distance. While there are di erent types of magnets, we look at the magnetism that is created by a moving electric eld. Not only can we use

Connecting a drive wheel to a shaft can become a major problem. A simple solution is provided (see Fig. 10.9). Purchase a largediameter plastic gear with a set screw. The mounting hole on the gear should match the shaft diameter of the stepper motor. Center the gear on the wheel. Drill three holes, 120 degrees apart, through the gear and wheel. Mount the wheel to the gear using three machine screws, washers, and nuts. Next mount the wheel gear assembly to the stepper motor shaft using the set screw.

magnetism to create physical forces to drive our robots, we can use it to a ect the behavior of our electronic circuits.

Like networking, Fibre Channel uses a layered approach in its architecture. The five layers in the Fibre Channel architecture are FC-0, FC-1, FC-2, FC-3, and FC-4.

Now let s build a simple stepper motor controller from a PIC16F84 and examine the operating principles of stepper motors.

An electromagnet is a temporary magnet created by current in a coil of wire. Recall for a moment the perpendicular forces of magnetism, electric current, and physical force from Figs. 4-1 and 4-2. Whenever you run electricity through a wire, some magnetism is generated. Normally, though, this is not enough to be useful. If you put enough current through a wire you might get some noticeable magnetism, but increasing the current to that level is rarely practical. What you need is a way to gather a whole bunch of magnetism together, collecting it into a bundle, until it has a useful strength. A tight coil of wire creates this bundling of magnetic elds. While electrons are owing through it, the coil is a magnet with a North and a South pole and magnetic ux looping between the two (Fig. 11-1). Magnetic ux is, roughly, the stu of magnetism as de ned by how dense the magnetic eld is over a particular area of space. The magnetic eld is normally shown as lines curving through