2n2222 is fine. Before you change the column resistors, add a transistor to one row and check that the display works as before. Then add the other 7 transistors and test again. Finally, change the column resistors to 300R or 330R.
2n2222 is fine. Before you change the column resistors, add a transistor to one row and check that the display works as before. Then add the other 7 transistors and test again. Finally, change the column resistors to 300R or 330R.