Elecraft K1 - Manual (Page 9)

8
E
LECRAFT
Unpacking and Inventory
Handling Integrated Circuits and Transistors
This kit uses integrated circuits (ICs) and transistors that
can be damaged by electrostatic discharge (ESD). Problems
caused by ESD can often be difficult to troubleshoot. To
avoid this:
Leave parts in their anti-static packaging until you install them
Use an anti-static mat on your work bench
Use a soldering iron with a grounded tip
Ground yourself using a wrist strap with 1-Mohm series resistor
At minimum, touch an unpainted, grounded metal surface
before handling ESD-sensitive components
Inventory
We recommend that you do a complete inventory, using the parts
lists in Appendix A. Start with the K1 Packing Box Parts list,
which details the items you should find when you first open the
box. Additional parts lists are provided for components used in each
subassembly. Component photographs are provided in most cases.
Identifying Resistors and RF Chokes
Resistor and RF choke values and color bands are provided in the
text. However, it's helpful to familiarize yourself with the color
code. The color-code chart, Figure 3-4, shows how to read the four
color bands on 5% resistors. For example, a 1,500 ohm (1.5 k) 5%
resistor has color bands BROWN, GREEN, RED and GOLD.
1% resistors are similar, but use five bands: three significant digits, a
multiplier, and tolerance. The first four bands on a 1.5 k, 1%
resistor are BROWN, GREEN, BLACK, BROWN. The multiplier
value is 1 rather than 2 in the this case because of the third
significant digit. 1% resistors have color bands that are sometimes
hard to distinguish clearly; use an ohmmeter to identify them.
The markings on RF chokes reflect their value in microhenries
(µH), using two significant digits and a multiplier. Example: a choke
with color bands RED, VIOLET, BLACK has value of 27 µH.
Tolerance
(gold = 5%,
silver = 10%)
Multiplier
Second Digit
First Digit
Color Multiplier Digit
Black 0 x 1
Brown 1 x 10
Red 2
3 x 100
Orange x 1K
Yellow 4 x 10K
Green 5 x 100K
Blue 6 x 1M
Violet 7
Gray 8
White 9
Color Code
Silver -- x .01
Gold -- x 0.1
Figure 3-4