pleas said me if is there a mistakes in this circuit shematic because if i select the position n° 1 for exemple some leds ordered by 2n2222 n°2 turn on despite their vcc is isolated ....I can't understand below the schematic:
The transistor collectors should be connected to the cathode ends of their respective LEDs. All LEDs should have their own individual current limiting resistors. The outputs of the 4017 are numbered 0-9 coresponding to a 1-10 sequence. There may be other errors, but those are the most obvious.
The second and third set of Black leds look like they are reversed, the leds need to be connected with the cathodes to the transistors, each led needs its own resistor,also if your only using 3 outputs, pin 15(reset) needs to be connedted to to the forth output (pin 7) to give a better display.