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Twenty-four: Analog To Digital Converters
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Figure 24-3 8 channel A/D converter ADC 2 Courtesy of Radio-Sky Publishing
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Table 24-1
Resistor color code chart
Twenty-four: Analog To Digital Converters
Color Band Black Brown Red Orange Yellow Green Blue Violet Gray White Gold Silver No color
1st Digit 0 1 2 3 4 5 6 7 8 9
2nd Digit 0 1 2 3 4 5 6 7 8 9
Multiplier 1 10 100 1,000 (K) 10,000 100,000 1,000,000 (M) 10,000,000 100,000,000 1,000,000,000 01 001
Tolerance
1% 2% 3% 4%
5% 10% 20%
The first color band will represent the first digit of the resistor code, the second color band denotes the second digit of the code, and finally the third color code represents the resistor s multiplier value Resistors will generally have a tolerance code which is the fourth color band The absence of a fourth color band indicates a 20% tolerance value, while a silver color band denotes a 10% tolerance and a gold band represents a 5% tolerance resistor A 100k ohm resistor s first band should be brown (1), its second color band is black (0) and its third band will be yellow (0000), so (1)(0) times (0000) = 100,000 ohms or 100k ohms Place the eight resistors on the circuit board and solder them in place Next, trim the excess component leads flush to the edge of the PC board with your end-cutters Capacitors are generally identified as polar and nonpolar types The polarized capacitors are also called electrolytic capacitors and they have polarity, as each of the two leads are labeled as plus (+) or minus ( ) and this polarity must be observed when installing these capacitors in order for the circuit to work correctly Non-polarized capacitors are usually small in physical size and in their actual value Take a look at the capacitor identifier chart in Table 24-2, it illustrates the capacitor codes used to identify smaller sized capacitors Many times small capacitors do not have room to print their entire details on the body of the capacitor, so a three-digit code is utilized to label them
For example, a 001 F is labeled (102), while a 01 F capacitor is labeled as (103) Identify all of the capacitors in the ADC-2 project and separate them into piles polarized vs non-polarized and place them in front of you Once identified you can go ahead and install the capacitors on the PC board in their respective locations Pay particular attention to installing the electrolytic capacitors correctly Once you have placed the capacitors on the board, you can solder them in place, then cut the extra component leads flush to the edge of the board The analog to digital converter contains a single silicon diode at D1 Remember that diodes have polarity and they must be mounted correctly for the circuit to work Diodes will generally have an anode and cathode lead, they will have a white or black band closer to one end of the diode The end closest to the colored band is the cathode lead, look at the schematic or part layout diagram and then install the diode This circuit employs two integrated circuits, the main A/D converter chip and a regulator chip An integrated circuit socket for U1 is highly recommended, so in the event of a possible IC failure, you can simply plug-in a new chip without having to un-solder 20 pins or more from the foil side of the PC board Integrated circuit sockets will usually have a notch or cut-out at one end of the package The pin just to the left of the notch or
Table 24-2
Capacitance code information
This table provides the value of alphanumeric coded ceramic, mylar and mica capacitors in general They come in many sizes, shapes, values and ratings; many different manufacturers worldwide produce them and not all play by the same rules Some capacitors actually have the numeric values stamped on them; however, many are color coded and some have alphanumeric codes The capacitor s first and second significant number IDs are the first and second values, followed by the multiplier number code, followed by the percentage tolerance letter code Usually the first two digits of the code represent the significant part of the value, while the third digit, called the multiplier, corresponds to the number of zeros to be added to the first two digits
1st Significant Figure 2nd Significant Figure Multiplier Tolerance 01 F 10% CSGNetworkCom 6/4/92
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