PROJECTS: PIXELMUSIC 3000
makezine.com/14/pixelmusic
3. SOLDER THE CIRCUIT BOARD
If you’re new to soldering, proceed with caution; there’s a lot of minute work here. Also, there’s no shame
in using a bigger perf board — it will make your life easier.
3a. Add the 40-pin socket to the
board, over the centerline, and solder
2 corners down. You won’t solder every
pin; on such a tight board, you only
want to solder the pins being used.
3b. Add the EEPROM and crystal.
Orient the EEPROM upside down, with
the pins nearest the notch ( 5 and 6)
facing the bottom of the board and
connecting to pins 37 and 38 of the
socket. Wire pin 8 to the middle rail
for power, and solder-bridge pins 1– 4
together and connect them to the
rail for ground. Connect the crystal
to pins 30 and 31 of the socket.
3c. Add the 10kΩ resistor. Wire one
side to EEPROM pin 5 and Propeller
pin 38. Wire the other side to power
and bridge the connection over to the
EEPROM’s power pin, pin 8 (under
the blue ground wire).
3d. Add all remaining power and
ground connections for the Propeller,
following the schematic.
3e. Solder the 4-pin programming
header to the edge of the board and
wire all of its connections.
NOTE: For each connection, fill both holes with
solder, then span them
with a wire. Or for short
straight runs with nothing
in between, you can use a
solder bridge. Test the
continuity to confirm
connections and check
for shorts.
120 Make: Volume 14
