Basic op-amp help

[smoguzbenjamin]

I've been scrounging around for a while on various sites looking for info on how to use opamps. I get the inverting/noninverting part, but what about gain levels? I read somewhere that it has to do with the resistor in the feedback path, but is a larger value resistor more gain, or less gain?   :?:

Or have I once again confuzzled myself?  :?

[Ansil]

the resistor in the feedback loop controls the amount of negative feedback ..  ie if you have two stereos going and one of them is in negative phase with the other.  as you turn up the negative phased one what happens..   they cancel each other out.. or the overall volume drops..  same with amps.. now if they are both inphase it gets louder.

so what you have is this.  look at most basic opamp schematics.. look at this one for instance.

http://www.mif.pg.gda.pl/homepages/tom/files/guvnor.gif

the first opamp stage has a 100k pot in the feedback path.. and there is a 2.2k resistor tied to it and then to a capacitor going to ground.

100/2.2= 45.45 gain at max.  what you get is the feedback resistor divided by the resistor tied to it.  .. check out ricardos cook your own opamp distortion over at
generalguitargadgets.com
it iwll help you laong.

[Thomas P.]

Somewhere (maybe the 'simple mods page') there was an article named "cooking your own distortion". It explains the basic use of OPAMPs and transistors, how the gain and frequenzy responce are set.
Nice one

[smoguzbenjamin]

tomboy, thats the article that Ansil meant. Its on generalguitargadgets.com under articles

I read that just a sec ago, everything's much clearer now.