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1. CA(U1) - common anode. You should connect it with Vcc. 2. Between U1 and outputs of U2A, U3A....U8A it is necessary to put resistors (for example, 300 Ohm).
As stated, correct the LED connection and add the series resistors. Also, for debuging, add the 7447 LED circuit you asked about previously. Once you get your NAND gate solution, you can delete the debug circuit.
