Ramsey Electronics AR2 Instruction Manual - page 21
AR2
• 21
Now we’ll start installing the other components, starting at the front of the PC
board and working our way around. This will make it easier to find the parts
you’re placing. There’s no polarity on the disc capacitors or resistors. You can
make the board look more professional by having all the writing on the caps
and all the tolerance bands on the resistors point in the same direction. But
the kit will work just as well no matter which way these parts face.
21. Install C18, 0.01 µF disc capacitor (marked .01 or 103 or 10nf).
22. Install R11, 1K ohm resistor (brown-black-red).
23. Install R15, 10K ohm resistor (brown-black-orange).
24. Install C24, 22pF disc capacitor (marked 22).
25. Install C20, 0.1 µF disc capacitor (marked .1 or 104).
26. Install C21, 10 µF electrolytic capacitor. This part has a polarity and
must be installed correctly to work properly . . . and so that it won’t
explode! You’ll note that one of the part’s leads is shorter than the other
and you’ll see a stripe or band down one side of the part; this should
correspond to the shorter of the two leads. The band and short lead
denote the negative side of the cap. Ironically the board will show which
way the positive, longer lead should be placed. Simply place the part,
correctly oriented, into its position and push it down to board level. Then
you can solder both leads.
27. Install C37, 1nF disc capacitors (marked .001 or 102).
28. Install C32, 10 pF ceramic capacitor.
29. Install D2, BB505 varactor diode (marked BB505. Orange body with
black band). This is another polarized part that must be installed correctly
to work. You’ll see a black band on the part and a white stripe on the PC
board silkscreen. Line these two markings up and solder the part in.
30. Install C38, 22 pF ceramic capacitor.
31. Install R22, 47K ohm resistor (yellow-violet-orange). This part is
installed in stand up fashion. That is, one lead will go straight into the
board while the other is bent around to go back down into the other hole.
32. Install C19, 0.1 µF disc capacitor (marked .1 or 104).
33. Install Q1, 2SC2570A NPN UHF transistor. The part has a flat side
Sometimes the ‘+’ sign is difficult to see on the PC board silkscreen.
You want to be sure you get the electrolytics in the right way so when in
doubt, use the Parts Layout Diagram to be sure.