22
c. SN74HC595 Shift Register (U3): The shift register decodes information received from the
microcontroller to operate the 3-digit display. This IC should be installed in the same way as
the previous chip.
i. Mind the divot on one end of the IC and align it with the PCB graphic at U3.
ii. Tack one pin in from the top (52), then...
iii. ...flip the board over and solder the pins on the solder side (53).
52
53
d. CD4050 Hex Driver (U4): This hex driver takes the MIDI data generated by the
microcontroller and sends it out the MIDI port with enough current to drive long cable
lengths. Once again, install this IC in the same manner as the previous chip. Remember to
align the divot on the IC with the PCB graphic on U4. Tack one pin in from the top (54), then
flip the board over and solder the pins on the solder side (55).
54
55
