Thanks a lot...
In fact I must admit in shame that I am an analog&mixed signal IC designer, but I always feel strange when I am working with discrete- off the shelf circuits...
I have lots of ideas (most of them are crap), but somehow they never make it out from the transistor level simulations like cadence, or hdl or matlab...
I just need some schematics to play and use as a basis...
But whenever I think about these circuits the first thing that comes to mind is 9V is too much for vdd. 3 is much better, but then swing will be small (relatively) again, but then the 9V batteries are quite large... etc...
Then I began to combine my ideas and it becomes full of switches and knobs...
But thanks a lot really...