Packaging of DIY kits
I have made this page so that you know what to expect when you receive a DIY kit.
A DIY kit comes with a printout of the Bill-of-materials (BOM). Below there is an excerpt from this BOM. This is how it is organized and how I am using it to package your materials):
|Part||Value||Package||Same as||Pieces per board|
You can see that C1, for instance, is a 1206-sized capacitor rated at 10uF/6V. In the “Pieces ber board” column, you can see that each board requires three such capacitors; thus, for e.g. two DIY kits, I would include six such caps.
Small SMD components come in “stripes”, so you will find this “stripe” taped conveniently on a printout of the BOM, exactly at the height of the “C1” row. As you will know of course, SMD capacitors come with no marking at all, so this taping on the BOM printout will help you a lot in identifying your components. Now, if you examine the second row for C2, you will see that C2 is the same as C1 and there is no quantity indication. This is because 10uF/6V/1206 capacitors required for your kits have been accounted for and included within the 3 caps-per-board in the “C1” row. So, whenever you see in the BOM a line with the “Same as” column not empty, you will have to look up the component taped at the height of the row for the named component (C1 in that case). If it sounds difficult, no not worry, you will find it very easy when you lay your hands on it. So, to continue my example, the “C3” row will have four 220nF/100V/1812 capacitors taped to the printout at the height of C3, and this includes the C3’s and the C4’s for two DIY kits.
Now, going down the BOM, when you receive your package, you will notice that some components, starting with C9, are noted with an asterisk and are not taped to the printout:
This is because these are non-SMD (or bulky) components, that are too large to be taped on the printout, so I have packaged them separately, inside a plastic bag. Luckily, all components so packaged so are easily identifiable by their marking, so there is no real reason to tape them on the BOM printout.
Note that I am hand-writing the asterisks as I am adding the components into the plastic bag, to make sure nothing is forgotten.
For some components, the BOM includes alternative values (for a configuration of the DC-DC converter with a higher inductance). In your package, you will find the “standard” values and not the alternative ones. The alternative values are marked on the BOM with an equal (“=”) line and with no quantities marked on the rightmost column, and all the values of the components (origina values and alternatives) are marked with a (printed) asterisk in the second column, like this:
This means that your kits will have an L1 with a value of 100uH. The (hand-printed) asterisk on the first column is because L1 is bulky and thus is included in the plastic bag.
JLVP is a special case. Yo will find it in your BOM printout (hand-)marked with a dagger sign:
This is to note that JLVP is not a “real” component. It is a solder-jumper, etched right on the PCB. You must not forget to solder this (see the instructions on the blog).
The pinheader connector KICSP is not included in the BOM, since you will not need it (the PICs packaged in the DIY kits are pre-programmed).
There is nothing more worth noting in the BOM and packaging.