Peter Ladefoged, allows you to master the vowels in heed /hid/, hid /hɪd/, head /hɛd/, had /hæd/, hod /hɑd/, hawed /hɔd/, hood /hʊd/, who’d /hud/.
With button and Praat You can analize what he is saying, and doing your recording until it satisfies you, you will have recognized the vowels [i , ɪ, ɛ, æ, ɑ, ɔ, ʊ , u].
RECORD AND COMPARE.