Don Pearce wrote:

On Tue, 22 Mar 2005 00:07:52 +0000, Pooh Bear
wrote:

I was talking in general terms ( and pointing out that the mic pre uses an
op-amp ). No point in having noise when you needn't.

Graham

In general terms, I agree. As for the mic pre, yes there is an op amp,
but its noise contribution is divided by the open loop gain of the
pair of input transistors. It would have to be very noisy indeed to be
significant in that configuration.

At *max gain* - yes. I'm very familiar with that configuration. The 'noise
floor' at min gain is usually set by the op-amp.

Graham