Make: Volume 75

surface mount buttons! It’s identical to the way

you soldered the resistors and capacitors: put a

blob of solder on one side, set the button in place,

then secure the other side

(Figure

F

)

.

You can use this same technique to solder

MOSFET Q1 into place. That part has three pins,

so just make sure each pin matches with a pad.

3. SOLDER THE INTEGRATED

CIRCUITS

There are three ICs on this board: a flash chip, an

SRAM chip and a GPIO expander. Like the diodes,

when soldering these parts you’ll need to be

aware of the orientation. Each part has a small

dot on its plastic body that should match with the

dot on the board’s silkscreen (Figure

G

).

The ...