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** https://note.com/solder_state/n/nde97a0516f03 and https://www.youtube.com/watch?v=op_DhPr2goc ** arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the PCB. If you use 9 mm vertical board mount OR: | | | | | R3, R21, R27, R28 R4, R6, R7, R30, R31 | 1 | SW_3PDT_x3 | 3PDT miniature toggle switch - 7mm, with 3-4mm extra space - micro toggle switch ON-ON | | | | R5 | 1 | Conn_01x07 | \*(optional) SIP socket, 2.54.

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