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Re: Opamp class A bias using FET - how to calculate resistor value?

See? I was right the first time :) Tnanks guys... I can't access that link from work, so I'll read it when I get home.

If I want to go the measuring route - what's a ballpark to start in? I don't want to fry the opamp because I picked a value that's totally off the scale. I think I want around 3mA, from what I've read. It seems that the optimum value is also opamp dependent, so does it make sense to play with say a 10K pot, and then put in fixed resistors once I've found the point I like?

Also, if I try this - what should I be listening for? What changes in the sound when I do this class A biasing, and what would change by increasing or decreasing the current? Also, how could I tell from the datasheet if I need to bias to V- or V+? I read a thread where someone said that some opamps should be biased the other way.

One last question - can I do this for the opamps in my CD player's output stage too?

So many questions :)

Thanks,
Saurav

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