I apologize for not making myself clear. what i altered was Vcc2. Instead of supplying 9v from the Arduino i supplied 20v from the bench power supply. i cannot figure out how to insert the diagram on this forum but it may be useful to scroll to the 3rd page of this website http://web.ics.purdue.edu/~fwinkler/616/sn754410_Arduino.pdf and observe the fritzing diagram.