FM100B • 34
35F. Install D2, the other MV2105 varactor diode. Again note orientation.
This diode provides our modulation.
36F. Install C9, a 10 pF ceramic capacitor (marked 10).
37F. Install R9, a 10K ohm stand-up resistor (brown-black-orange).
38F. Install R23, a 470K ohm stand-up resistor (yellow-violet-yellow).
39F. Install C30, a 0.001 uF ceramic capacitor (marked 102).
40F. Install R14, a 47K ohm stand-up resistor (yellow-violet-orange).
41F. Install C11, a 0.1 uF ceramic capacitor (marked 104).
42F. Install R10, a 100K ohm resistor (brown-black-yellow).
43F. Install R11, a 220K ohm stand-up resistor (red-red-yellow).
44F. Install C3, a 10 uF electrolytic capacitor. The ‘+’ sign indicates the
positive lead and the negative lead is marked by a stripe or a band on the
part itself. The positive lead (it is also the longer of the two) should be
placed in the hole marked with the ‘+’ sign. Proper orientation of this part
will ensure proper operation of your VCO and therefore your whole kit.
45F. Install R36, a 1K ohm trimmer potentiometer. The top is orange and
marked 102. This pot is used to adjust your RF level to minimum require-
ments to prevent interference.
46F. Install C43, a 0.001 uF ceramic capacitor (marked 102).
47F. Install L1, the large metal can inductor with the tunable slug. Make
sure the pins are through the holes before soldering into place.
Whew! That was a lot of steps. Definitely check all of your work up to this point
for orientation mistakes. Double check all of your electrolytic capacitors to be
sure the positive symbols are on the opposite side of the negative stripe. Also
make sure there are no solder bridges or cold solder joints. Lastly check your
surface mount components with an eye loupe or magnifier to see if there are
any solder blobs where there shouldn’t be.
If there are no problems up to this point it is time to move on! Now we are on
to easier stuff with less steps. Be careful with your assembly, you wouldn’t
want to get this far and then make a mistake causing the project not to work.
With soldering iron in hand, on to the next section!
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