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Just finished building my TPD. It is recommended on the WIKI to test everything before soldering the led displays in place as they cover several of the 595 IC. The schematic is good but there is a lot more data that would make testing go much quicker and easier. Here are the work sheets I put together to test my TPD. Hope this saves you from having to work this out on your own.   The following Dout assignments are with the TPD directly connected to the core with nothing in between. This is recommended for testing as you do not have to worry with anything else if your core is good. Dout shift register chip chain order and pin counts   u1    u2     u6      u7      u8       u3      u4      u5        u9  0-7  8-15 16-23 24-31 32-39 40-47 48-55 56-63   64-71 SEG SEL  M2G  M2R  M2CA M1G  M1R  M1CA BiLEDS   U10 is on its own DIN serial chain. DIN is easy to test just close the switch and you should see the pin toggle in the console.   To test Digital Out Shift Registers from the mios console: Set dout 0 1 --> sets dout 0 to 5v set dout 0 0 --> sets dout 0 to 0v I liked turning things off as I went so only the one that I was testing was on.   IC IC pin dout#   led pin          IC IC pin dout#   led pin          IC IC pin dout#    led pin U3  1       40         10               U4  1        48         11               U5  1        56         12        2       41         7                       2        49          8                       2        57          9        3       42         4                       3        50          5                       3        58          6        4       43         1                       4        51          2                       4        59          3        5       44         22                     5        52          23                     5        60          24        6       45         19                     6        53          20                     6        61          21        7       46         16                     7        54          17                     7        62          18      15       47         13                     15       55          14                    15      63          15   IC IC pin dout#   led pin          IC IC pin dout#   led pin          IC IC pin dout#    led pin U6  1       16         10               U7  1        24         11               U8  1        32         12        2       17         7                       2        25          8                       2        33          9        3       18         4                       3        26          5                       3        34          6        4       19         1                       4        27          2                       4        35          3        5       20         22                     5        28          23                     5        36          24        6       21         19                     6        29          20                     6        37          21        7       22         16                     7        30          17                     7        38          18      15       23         13                     15       31          14                    15      39          15   Led matrix pin out from top of board: 13 14 15 16 17 18 19 20 21 22 23 24  0   0   0   0   0   0   0   0   0   0   0   0   1  0   0   0   0   0   0   0   0   0   0   0   0  1   2   3   4   5   6   7   8   9  10  11 12   For U1, U2, U9 and U10.  These IC are also not captive when the board is complete so you can get at them fairly easily. It would still be good to test everything with just the IC, caps, box header and resistors on the board. It is a lot easier to get at the ic legs with a soldering iron with the other components not in place. IC IC pin dout#   led pin          IC IC pin dout#      led pin         IC IC pin dout#    led pin             IC     IC  Pin  Dev Pin U1  1        0         a                  U2  1         8           Step 100      U9  1        64         G                 U10       11        ENC1        2       1          b                         2        9           Step 10              2        65         G                               12        ENC1        3       2          c                         3        10         Step 1                3        66         G                               13        ENC1 SW        4       3          d                         4        11         BPM 100            4        67         R                               14        Available        5       4          e                         5        12         BPM 10              5        68         R                                 3        SW1        6       5          f                          6        13         BPM 1                6        69         R                                 4        SW2        7       6          g                         7        14         BPM .1               7        70         R                                 5        SW3      15       7         DP                     15        15         Available           15       71         G                                 6        SW4     Hope this makes your testing go much easier. I did this on paper and marked with red anything that was not working or just did not seem right.  I then went back and soldered anything that needed it again then retested. I am not sure why but some of those 595 pins just do not want to take solder. Maybe I just need more practice or flux.   on the encoder mine is turning backwards. I read elsewhere to set the config to the odd shift register instead of the even. I have not tried this yet but will give it a shot. Tested and I set the Encoder to 1 instead of 0 on the shift register and it is good to go now. Does anyone know how to get the display to run in the other modes? I see in the sequencer program that there are other modes but I do not see a way to alter it. Is there a pointer to the location of the text that displays on the TPD on startup? It plays "HW config v4l" on startup. I have not located it yet in the code but am looking.   I looked through the TPD wiki and the seq manual but do not see anything on the above.   Thanks for the great add on to the SEQ now I just need to get the panel cut for it.  

A number of people claimed interest in a Eurorack variant of my TPD, so I sat down and tried to modify the parts layout to somewhat better accommodate the Eurorack width. Here is a screenshot of the PCB. It is essentially built on altitude's advice on Eurorack dimensions, which I know nothing about... is this 14HP? So, the PCB is 100mm x 69mm (height x width), and the parts list is identical to the regular standard TPD. Also, the UI has the exact same layout, so you can use the template in the Wiki for your front panel. The mounting holes are different, though. Depending on interest, I might get a run of boards made after an initial testing of the prototype which will probably go to altitude.

garbage in the matrix & the numeric displays, & the LEDs on the seq itself are flickering, buttons non-functional. sequencer happily playing though.   when I unplug the TPD, the sequencer is back to normal. sometimes when I plug in the TPD, there's nothing at all, other times the displays will light up but not moving or with anything useful in them.   I'm guessing one of the 595s has gone bad, but it's going to be tricky to isolate the culprit as they are connected in parallel & some of them are hiding. :-/   I *think* the problem is with one of the 74HC595s that I can actually get at.... I've carefully cut the track where it goes up from the socket to U2 & this has stopped the TPD from interfering with the sequencer's control panel, suggesting that one of the clock signals is being shunted or held high by either U1 or U2.   anyone else had a problem like this?

I recently received a few requests for TPD kits, as some of the parts seem to be difficult to obtain in some areas of the world - surprisingly, the 7 segment LED displays were among them. Unfortunately, I cannot do complete kits now, but I have purchased enough parts for 5 "semi" kits that should help with the most difficult parts. The semi kits consist of:   1x TPD PCB 7x 7segment LED display green 2x duo LED matrix module 1x rotary encoder with switch 4x three-legged common cathode duo LED, clear or diffuse, you decide   These are thought for people who are really having difficulties finding these - as I had to pay import duties to Norway you will most probably be cheaper if you can order them elsewhere. I am asking 24€ plus shipping per semi kit as above. For more information about the TPD have a look in the Wiki: http://www.midibox.o....php?id=tpd_pcb   PM me or post interest here, I can ship immediately.   Best, ilmenator