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Kit Construction:
Keep semiconductor parts in the anti-static packaging until you are ready to use them.
Always use good static control practices when working with static sensitive parts. This
means you should wear a grounding strap or work on a static-dissipative work surface.
Use a grounded tip soldering iron. When soldering small parts it is a good idea to use a
small, pencil-type soldering iron of no more than 25 Watts or so, or a temperature
controlled soldering station. Use pliers, clamps or alligator clips as heat sinks to prevent
heat damage to parts while soldering. If you are not fairly experienced with soldering
small parts, you may want to practice on some scrap parts first or get some help.
Work in an area with good lighting. You may want to use a magnifying lens to do some
of the small soldering required. Insert each component from the top of the board (the
side with the white silkscreen lettering), in the order shown in the instructions below. As
each component is installed, solder the leads and trim off excess leads with a small pair
of side cutters.
Before beginning assembly it is a good idea to unpack components, identify each part
and check for any missing parts.
Locate the printed circuit board (PCB). Orient the PCB with the white silk-
screened printing facing up. Use the component markings and outlines to aid in
placing components.
Locate the four .1 µF capacitors. These will be marked "104". Install in the
locations marked C3, C4, C5 and C8. They are not polarity sensitive, so you do not
have to worry about installing them backwards.
Locate the two .01 µF capacitors. These will be marked "103". Install these
capacitors in the locations marked C1 and C7.
Locate six 2.2K Ohm resistors (Red-Red-Red). Install these in locations R1, R3,
R4, R5, R6 and R7. (NOTE: You may omit R3 if you do not want PTT coupled to the
audio signal).
Locate the two 100K Ohm resistors (Brown-Black-Yellow). Install these in the
locations marked R2 and R8.
Locate the two 2N7000 MOSFETs. Install these in the locations marked Q1 and Q2.
Make sure to orient the transistors with the flat side facing as indicated by the outline
on the PCB.
Locate the two 1N4732 Zener diodes. Install them in the locations marked D1 and
D2 on the PCB. These parts must be installed with the proper polarity; make sure the
cathode ends (the ends with the black ring) are toward the silk-screened circles on the
PCB.
Install the 8-pin IC socket in location U1. Make sure the notch is oriented toward
the top of the PCB as shown in the component outline.
Locate the 100 µF electrolytic capacitor in location C2. Make sure to observe the
polarity marking on the board. The longer lead should go into the hole marked "+".
Locate the 10 µF electrolytic capacitor in location C6. Make sure to observe the
polarity marking on the board. The longer lead should go into the hole marked "+".
Connection Kit Manual
04/18/2008
Page 2 of 4
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