I am used to using all discrete components and one of my main engineers when starting this project spoke about this IC as if it has almost mythical properties. Well after seeing all the ways it can be used and studying the topography and white pages, i can see why. I ended up buying a ton of them and he told me that there is a way to use it as a line in, biased A prior to the VAS stage. Basically the power to the chip will be coming in via the preamp so try and think of it not as an opamp as much as an discrete circuit. I believed the white pages showed a capacitor on the pos and neg rails in and out of it, but i could have sworn rick said something about bootstrapping a 4.7k resistor to the v in and v out. i would rather not have to use another DC rail to power this or a step down transformer since it will not have the gain to drive much but maybe another chip possibly using an opt as a driver for my output transistors - being fully linear and fully differential, as well as possibly using it as a servo for DC zero neg feedback makes it interesting. Can someone help me brain storm about the best way to implement this? i do have additional windings on my toroid for 12 and 18v - if anything like the slew rate in compromised because of lack of power i am we can sure a number of things out. I am looking to minimize parts and improve the design, speed up build time, minimize biasing time and until recently I have not seen the value of an IC for true analog solid state amp designs - the output transistors are LFETS. I am currently getting .005 THD on my all discrete design, and it is unconditionally stable at 4 ohms and 2 ohm stable. It is an over built design for sure but it is solid - I would like to use an IC (preferably the lm6171 because its fully linear, fully differential and fast) for the input and zero neg feedback biasing if possible from 1 chip.
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