> 
> 
> Is there any good book or sites on amplifiers. Still
> cannot quite explain the "action"/flow of the
> amplifier circuit.
> 
> Thanks,
> John
> 
Search TI.COM for a copy of "Op Amps for Everyone" by Ron Mancini.  Also
cruise around the application note area at TI, National Semi and Analog
Devices.  Some of the older app notes, especially the National Semi ones
written in the 1970's have some good, basic, classroom stuff.

You might be able to find a used copy of Walter Jung's "OpAmp Cookbook"
or just break down and buy one.

A nice general reference would be Horrowiz and Hill's "The Art of
Electronics" 2nd ed.  Getting a little dated on some of the material
(the microprocessor/microcontroller section for example) and some of the
parts the reference have ceased production but still a good book.

Download a copy of SwitcherCAD III from Linear Technology so you have a
nice free SPICE engine with GUI to play with.  That can help you
understand what is happening (the theory, but not always the
implementation) in an amplifier (BJT, CMOS, FET, op amp, tube, whatever)
circuit.

Rob
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