Sorry, Poor instructions.Just did... but now I'm getting the following error:
It seems that VDD belongs to the schmidt gate:
The thing that's neat about this set is that you can hook them up to your supply, be it 5, 10 or 15 volts. The requirement is that you add a label to the supply you want to hook it to named Vdd. So if your power supply for the circuit is 12 volts add a label to the 12 volts calling it Vdd.