Todd Bailey wrote:

> Recently I started designing a discrete BJT op-amp (my first time) for an
> audio circuit, and in doing so have been studying the manufacturers'
> schematics of different monolithic op-amps.  In several of the circuits
> (the 741 [Horowitz and Hill, p.189] and the 5532
> [http://www.dself.dsl.pipex.com/ampins/webbop/5532.htm] so far) I have
> seen components drawn into the schematic which look like a normal BJT
> with an extra collector or emitter leg drawn on.

I'm not sure what you are trying to do, but it seems to me that the 
techniques to use when building an amplifier from discrete components are 
quite different from the ones to use when creating an integrated circuit. 
The "components" available are just too different in the two cases. Also 
don't forget that the schematic of an integrated circuit is something like 
an approximation; this becomes more obvious when you look at the actual 
silicone layout.

If you want to build a discrete audio amp, you are probably better off with 
some literature about discrete amps, rather than studying schematics of 
integrated opamps.

Gerhard

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