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or 100,000 picofarads. Values over 1000 picofarads are most often stated in microfarads. To make the conversion, move the decimal point to the left six spaces: 0.1 F. Note that values under 1000 picofarads do not use this numbering system. Instead, the actual value, in picofarads, is listed, such as 10 (for 10 pF). One mark you will find almost exclusively on larger tantalum and aluminum electrolytic is a polarity symbol, most often a minus ( ) sign. The polarity symbol indicates the positive and/or negative lead of a capacitor. If a capacitor is polarized, it is extremely important that you follow the proper orientation when you install the capacitor in the circuit. If you reverse the leads to the capacitor connecting the positive lead (called the anode) to the ground rail instead of the negative lead (called the cathode), for example the capacitor may be ruined. Other components in the circuit could also be damaged. Fig. 5-10 shows some different capacitor packages along with their polarity markings.
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5.6 Diodes
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The diode is the simplest form of semiconductor. It is available in two basic flavors, germanium and silicon, which indicates the material used to manufacture the active junction within the diode. Diodes are used in a variety of applications, and there are numerous subtypes. Here is a list of the most common.
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Rectifier. The average diode, it rectifies AC current to provide DC only. Zener. It limits voltage to a predetermined level. Zeners are used for low-cost voltage regulation. Light-emitting. These diodes emit infrared of visible light when current is applied. Silicon-controlled rectifier (SCR). This is a type of high-power switch used to control AC or DC currents. Bridge rectifier. This is a collection of four diodes strung together in sequence; it is used to rectify an incoming AC current.
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Diodes carry two important ratings: peak inverse voltage (PIV) and current. The PIV rating roughly indicates the maximum working voltage for the diode. Similarly, the current rating is the maximum amount of current the diode can withstand. Assuming a diode is rated for 3 amps, it cannot safely conduct more than 3 amps without overheating and failing. All diodes have positive and negative terminals (polarity). The positive terminal is the anode, and the negative terminal is the cathode. You can readily identify the cathode end of a diode by looking for a colored stripe near one of the leads. Fig. 5-11 shows a diode that has a stripe at the cathode end. Note how the stripe corresponds with the heavy line in the schematic symbol for the diode. All diodes emit light when current passes through them. This light is generally only in the infrared region of the electromagnetic spectrum. The light-emitting diode (LED) is a special type of semiconductor that is expressly designed to emit light in human visible wavelengths. LEDs are available to produce any of the basic colors (red, yellow, green, blue, or white) of light as well as infrared. The infrared LEDs are especially useful in robots for a variety of different applications.
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Cathode Band Schematic Symbol for a Diode
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FIGURE 5-11 The polarity of diodes is marked with a stripe. The stripe denotes the cathode (negative) lead.
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LEDs carry the same specifications as any other diode. The LED has a PIV rating of about 100 to 150 V, with a maximum current rating of under 40 mA (usually only 5 to 10 mA is applied to the LED). Most LEDs are used in low-power DC circuits and are powered with 12 V or less. Even though this voltage is far below the PIV rating of the LED, the component can still be ruthlessly damaged if you expose it to currents exceeding 40 or 50 mA. A resistor is used to limit the current to the LED.
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