Now, let's get building!
First, we’ll install the “normal” parts that mount on the “component “ side of the circuit board with their leads passing through to the “solder” side of the board. This will also help us to get acquainted with the up - down, left - right orientation of the circuit board. Remember that the chip components will be mounted on the solder side of the circuit board so only use the amount of solder necessary to make the connection, being careful not to “flood” the circuit board traces with solder.
1. Sort your surface mount components by type to make it easier when installing. The parts are in marked bags that are easily identifiable. The markings on the individual parts will be explained when the part is installed.
2. Install crystal Y1, marked 12, 16 or 24.
3. Install the black plastic battery holder. Note the polarity markings on the holder and install correctly.
Now you’ll begin soldering the surface mount components to the solder side of the circuit board. If there is any question as to how they should be installed, review the surface mount soldering instructions. For correct positioning, consult the component layout diagram.
4. Install C1, 10 uF electrolytic capacitor, orient the marked ‘+’ side as shown.
5. Install C2, .001 uF chip capacitor.
6. Install L2, .10 uH chip inductor. If you look very closely, you’ll see that it is marked either R10 or 101K in very tiny letters! Inside of that little body is a very small coil of wire.
7. Install L1, .15 uH chip inductor, marked 151K in little, tiny letters.
8. Install C9, 5 pF chip capacitor.
9. Install C8, 5 pF chip capacitor.
10. Install R9, 100K ohm chip resistor.
11. Install C11, another 5 pF chip capacitor.
12. Install Q4, the MMBTH10L NPN surface mount transistor (marked 3E). Be sure to orient it as shown in the parts placement diagram. Those sure are small mounting “tabs”, aren't they!
13. Install C7, the last 5 pF chip capacitor.
MR6 • 10
