Boards usually come with their design faults, but for this version it is acceptable:

• Diode D1, (below the Arduino) should be replaced by a shorting wire.

• The resistor array uses only eight of the nine resistors, but unfortunately has to be a ten pin array. A 9 pin array can be used but must be mounted on pins 2 to 10, and a short has to be made between pin 1 and 2.