Other Parts Discussed in Thread: NE5534
Hi All,
We have a problem with DC offset in one of our products, related to the input bias current of the NE5534's that we're using. The issue wasn't present when the product was designed, and it's been in production since about 2006. Unfortunately we don't really know when the issue started to arise, as it's not something we test for routinely in production.
I should stress that the parts we're buying now seem to be within spec, but I suspect that when the product was originally designed either the parts where beating bias-current spec by some margin, or another offset factor was cancelling the effect that we're seeing today.
So my question is, has there been any change in the design or manufacturing process of the NE5534 in the last 10 years or so that might have affected these parameters?
I think the truth is that we may have changed supplier at some point, but I'd like to be able to rule out a change in TI's parts.
Thanks.
