The
e in 'Princeton' is
silent, so the word doesn't have a
t after a vowel. It is preceded by /s/. Use a neutral, unaspirated T, not D.
In general, a T that connects an unstressed syllable to a stressed one is pronounced as an aspirated T. So the bolded T's below are all pronounced T, not D.
attend, liturgical, utopia, detergent, return, atomic, isotope, rotation
CJ