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Great Instructable! I am new to arduino electronics. I have a question concerning the schematic: Is the last TPIC6B596 Ground connected to the Arduino board? In case of using only the ATMega 328 IC, will there be a sinking current problem or not? I hear that common cathode 7segs will have the problem. I only have a cathode 4 digit 7segs display, how would the schematic look in this case?Thanks