1 x 78L33 voltage regulator
1 x 28pin DIL socket
2 x 6mm screws
2 x 2N3906 transistor
2 x 8 pin DIL socket
2 x 8mm screws
1 x CD4050BE
3 x 16 pin DIL socket
1 x Front panel
2 x 74HC595
1 x female header
1 x micro SD Card
1 x MCP4921
1 x male header
1 x display window
3 x PCB
The GRANDPA module consists of three boards, the top board is used for all of the UI components, the
bottom board is the heart of the sound generating circuit and a small SD card holder board.
Bottom board
Lets start with the bottom board, with the shortest and smallest parts.
Take a strip of resistors and look up the values printed on the circuit boards. Start with the 100K and 1K.
Place them through the board, solder them and clip off the excess leads.
Attention!
Wrong label on the board
.
The 100K resistor from in the lower left part is omitted and instead just
solder in one of the cut off leads from the other resistors. Also the 1K above it is completely omitted.
Next solder the power protection diode. Be careful though, diodes are
polarized
!
Make sure that the
marking ring on the diode body matches the marking on the circuit board.