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1 x 78L33 voltage regulator
2 x 2N3906 transistor
1 x CD4050BE
2 x 74HC595
1 x MCP4921
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 p olarized ! Make sure that the
marking ring on the diode body matches the marking on the circuit board.
1 x 28pin DIL socket
2 x 8 pin DIL socket
3 x 16 pin DIL socket
1 x female header
1 x male header
2 x 6mm screws
2 x 8mm screws
1 x Front panel
1 x micro SD Card
1 x display window
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