Article on "making your own" op amps?

[$uperpuma]

I'm sure no one means to make me feel small-brained... but dang it if I'm not challenged to learn something everyday here... for my self-respect if nothing else...

[Meanderthal]

 Didn't Joe Davisson do a discrete opamp thing with the diode compression circuit?

[Jay Doyle]

Here's a couple of references for those who want to look into it. The first is Doug Self's take on it, which is a pretty good intro all by itself. Be forewarned, he got the schematics reversed. The simple opamp schematic is where the more complicated, better one should be and vice versa.
http://www.dself.dsl.pipex.com/ampins/discrete/discrop.htm

http://sound.westhost.com/project07.htm

http://www.johnhardyco.com/990OpAmpDetails.html

And the reigning queen of the discrete opamps:
http://recording.org/users/kev/Jensen_990C_schematic.tif

R.G., those are the same links I gave 13 posts above.

Here is my version of a discrete op amp (Leave C5 out, it is redundant): http://www.diystompboxes.com/pedals/schems/DiscreteBoost.pdf

Hopefully some of the explanations will help.

Regards,

Jay Doyle

[R.G.]

Oops. Sorry. Jay's right - listen to him!