About past tense "ed". How do you pronounce it?

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May 18th 2012 04:18
"-ed "as in wanted, needed.

Is it like a weak sound of e as in eat, meet?
Or, is it like a weak sound of i as in sit, bit?

According to the spelling, I think it should be pronounced a weak sound of e as in eat.
But, All dictionary use a pronunciation symbol, i as in sit.

And, there is a similar question. How do you pronounce e in "decline" ?
In this word, all dictionary also use a pronunciation symbol, i as in sit.
I think in this case, it should be pronounced a weak sound of e as in bed.

Or, e in eat, e in bed, and i in sit of each week sound are completely the same sound?