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CHAPTER 10 Capacitance
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Fig. 10-25.
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Twin-T notch lter.
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Audio lter
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Try This: Design some of these lters, and then build them on your breadboard. Plug them into the audio circuit you used for the capacitor test and see what they do. The load resistor is the speaker, and this will be 4 or 8 ohms. If it is an ampli ed speaker then all bets are o . Change the component values and see how they a ect the lter.
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DIODE-CAPACITOR CIRCUITS
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Some interesting e ects can be had by mixing capacitors with diodes. For example, we can revisit our full-bridge recti er from Fig. 10-8 and add a large capacitor to it to smooth out the ripple. Ripple is the amount by which a signal wobbles away from a pure DC line. Figure 10-26 shows a ltered AC to DC power circuit. This is a very common circuit, found in all sorts of systems. You want a large capacitor in this circuit. You aren t tuning the circuit against a speci c frequency so much as you are using the capacitor s ability to store an electrical charge. The signal charges the capacitor as the voltage rises so the output is somewhat less than it would normally be. As the signal voltage drops the capacitor discharges, raising the output voltage above what it would normally be. The result is to smooth out ripples in the signal.
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Capacitance
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Fig. 10-26.
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Power lter.
Fig. 10-27. Voltage doubler.
Fig. 10-28.
Voltage multipliers.
Voltage multiplier
A circuit that seems like magic is the voltage multiplier. I present it here as a bonus circuit. Try it out. Try to gure it out. Figure 10-27 is a simple voltage doubler. This circuit, like the others, requires an AC signal on the input to work correctly. Figure 10-28 shows a voltage tripler and quadrupler. More diode networks can be added to get as much voltage as you can stand.
CHAPTER 10 Capacitance
Summary
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.
Quiz
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
CHAPTER
Inductance and Magnetism
Introduction
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
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