U3a 3 + 11 in Software

Generation GS1 - 13 in Software U3a 3 + 11

Table 13-1

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 5% 10% 20% 1% 2% 3% 4% Tolerance

the components into the circuit board You can fabricate your own circuit board from scratch if you are an experienced builder or you could elect to build the receiver from the kit supplier, Ramsey Electronics, listed in the Appendix We will build the receiver in sections and will begin first with the antenna and input pre-amplifier section Before we go ahead and build the aircraft receiver, let s take a few moments to look at Table 13-1, which illustrates the resistor color chart Resistors have three or four color bands, which begin at one edge of the resistor body The first color band represents the resistor s first digit value, while the second color band denotes the second digit of the resistor value The third color band represents the multiplier value of the resistor The fourth color band denotes the tolerance value of the resistor A silver band represents a 10% tolerance, while a gold band notes a 5% tolerance value The absence of a fourth color band states that the resistor has a 20% tolerance value Therefore, a 10,000 ohm or 10 k ohm resistor would have a brown band (1) a black band (0) and a multiplier of (000), and an orange band Go ahead and install resistors R4, R5 and R6, then solder them in place on the PC board Then cut the excess leads from the PC board with a pair of

end-cutters Cut the excess leads flush to the PC board Next we are going to install the capacitors for the project Capacitors are described as electrolytic and non-electrolytic types Electrolytic types are large sized and larger in value than non-electrolytic types Electrolytic type capacitors have polarity, ie both a positive and negative terminal, often with color band and/or (+) or minus ( ) marking on them These electrolytic capacitors must be installed with respect to these polarity markings if you expect the circuit to work correctly Take your time installing them and refer regularly to both the schematic and parts layout diagrams Non-electrolytic capacitors can sometimes be very small in size, and often their actual value will NOT be printed on them A three-digit code is used to help identify these capacitors; refer to Table 13-2 For example, a 001 F capacitor would be marked with (102), while a 01 F capacitor would be marked with (103) Go ahead and install capacitors C1 through C8 into their respective PC holes on the PC board, being sure to observe polarity on the capacitors before installing them on the PC board Most electrolytics will have a black band or a plus or minus marking next to a pin Solder the capacitors to the PC board, then remove the excess leads Next install inductors L1, L2, L3 and L4 into

Table 13-2

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,