Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Ok this is what I did

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So I hooked everything up

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Then did some requested calculations

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Seems like a lot of trouble for nothing but I did get the "right answer" the book said for the 741c Op-Amp the typical value for the input offset voltage is 2 mv. 

I'm not yet running through the streets shouting eureka but hopefully later the significance of this will become apparent.

 :loco

I actually have a big boat anchor power supply that has +5, -5, 10 and 49v used in the 90s for my friends wife's families answering service.

At first I was wondering if I could convert the plus and minus 5v to plus and minus 15v but I think that will be too complicated.

So I started looking at supply voltage for these Op-Amps and I am seeing a range....I was wondering if they operate the same over a voltage range.  For instance does it matter if it's plus and minus 11v..?  When I was trying to decipher the data sheets they did list a max of 20v.

I was gonna duplicate the experiment using plus and minus 5v and see if I got the same results.  But when I went to set it up I didn't want to butcher the nice molex harness so I'm gonna have to get some molex connectors .

Regardless I need a convenient source of Vs to do this on a regular basis.

:grr

They will operate like the datasheet says within their specified voltage range.  That said, the higher the voltage input, the higher the voltage swing on the output is possible.  If you are looking for clean amplification you also need higher voltage to keep the headroom.  IE - if you have 2v into the circuit with a gain of 10x, it will try to output 20v. If you are only supplying it +/- 5v it is going to clip like crazy.  Depending on the sound you are going for, maybe that is a good thing, maybe not.