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to the circuit board; remember to trim the extra lead lengths form the PC board Once all the resistors have been installed onto the circuit board, we can move on to identifying all of the capacitors for the project Note that there will be different looking capacitors for this project, some will be small disks, while others will be larger body devices with minus and plus marking on them These larger capacitors with polarity marking are electrolytic capacitors and they have polarity which must be observed for the circuit to work correctly Look through the parts pile and locate the capacitors and place them in front of you You will notice a number of small disk capacitors, we will install these first Look closely at each of the disk capacitors at their markings Sometimes the capacitors are very small and they may not have their actual value printed on them but will instead have some sort of code marked on them Refer to the parts list for these codes or the capacitor code chart in Table 11-2 Locate four or five of these small disk capacitors, identify them and install them on the circuit board, while referring to the schematic and layout diagrams After inserting the disk capacitors onto the circuit board, you can go ahead and solder them to the circuit board Remember to cut the excess component leads Next, move on and install another grouping of small disk capacitors, then solder them in place on the printed circuit board Cut the extra component leads after soldering in the capacitors When you are finished installing the small capacitors we will move on to the larger electrolytic types Capacitors C14, C32, C33 and C35 are all 100 uF to 200 F electrolytic types These capacitors will have either a plus or minus marking and/or black band denoting polarity You must orient these capacitors with respect to their polarity markings Check both the layout diagram and the schematic diagram for polarity references Note also that capacitors C15, C30 and C36 are also electrolytic capacitors with a 47 F value These too must be oriented correctly for the circuit to operate correctly when power is applied It is possible to actually damage the circuit upon power-up if these capacitors have been installed incorrectly, so pay careful attention when mounting these capacitors Install the electrolytic capacitors in groups of two or three Once they have been placed on the circuit board, you can move on to soldering them in place Remember to trim.

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the excess component leads from the PC board after soldering Next we will move to installing the two diodes Diode D1 is the varactor tuning diode while D2 is a 1N4148 silicon diode When mounting the diodes be careful to observe polarity markings on the diodes Usually each diode will have a black or white band at one end of the diode body This color band denotes the cathode end of the diode Refer to the schematic diagram and layout diagrams in order to see how the diodes should be mounted with respect to polarity considerations Before we go ahead and install the semiconductors, take a look at the semiconductor pin-out diagram in Figure 11-4 which will help you orient the components Now locate the transistors from the components Transistor Q1 is a 2SC2498 or 2SC2507A, while transistors Q2, Q3 and Q4 are 2N3904 NPN types Transistors have three leads, a Base lead, a Collector lead and an Emitter lead The symbol for the Base is a vertical line, while the Collector and Emitter are slanted lines pointing to the Base lead The Emitter lead is shown with a small arrow pointing towards or away from the Base lead Refer to the schematic and layout diagrams to determine the orientation of the transistors Clearly identify Q1, the 2SC2498 or 2SC2570A transistor Do not confuse it with the other transistors supplied Position Q1 as shown on the PC board layout, with the flat side facing to the right, toward the middle of the board Press the transistor snugly into the PC board so that only a minimum amount of wire lead is exposed above the board In soldering, don t be afraid to use enough heat to make good clean connections Once the transistors are in place on the PC board, you can go ahead and solder them to the foil side of the PC board Don t forget to trim the extra component leads Now we are going to install FL1, the ceramic filter This component looks like a capacitor with three leads and may be installed either way Next go ahead and locate FL2, the 450 kHz filter Its three leads are delicate and fit in only one way At this time you can locate Y1, the 1024 MHz crystal No special procedure is required Simply press the crystal firmly into its holes as far as it will go Now go ahead and solder in the crystal and ceramic filters, remove the excess leads if any.

units in the College of Architecture, Planning, and Landscape Architecture (CAPLA) The graduate professional program offers the Master of Landscape Architecture degree as an accredited, three-year curriculum Current enrollment is approximately fty graduate students

Table 11-2