From Hull AWE
- it is most commonly a plain '-d' (IPA: /d/), but
- after alveolar consonants the vowel '-e-' is realized and '-ed' becomes the syllable '-id' (/ɪd/), as in the disyllables 'wanted' (/'wɒn tɪd/) and 'worded' (/'wɜːr dɪd/);
- after some other consonants, such as '-s-', the sound is the unvoiced consonant '-t-' rather than the voiced '-d-': 'crossed' is the monosyllable 'crossed' (/krɒst/), and 'laugh' gives 'laughed' (/lɑːft/).
You may also want to see -s (phonetic).