- #1
Kevin2341
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Homework Statement
I'm working on a project for my circuit analysis class in which we designed a circuit that involves a wheatstone bridge, takes the voltage difference and then amplifies it to a useable level. I am past that phase of the design, I have a working circuit for that on a schematic. I also have build the "prototype" on a breadboard, which needs testing (tomorrow actually during lab). I am looking for help getting negative voltages for opamp Vcc+/- rails
Homework Equations
None really, it's a method question more than mathematics
The Attempt at a Solution
I understand the concept of getting negative voltages just fine on paper. You have a voltage source with one resistor at the positive, and another at the negative, the two meet up and go to ground, and bang, you got negative voltages on your negative terminal to ground. That part is fine for me.
However, the practical application has me scratching my head, because I do not understand what is my "ground" on the physical circuit. All of my circuits in the past never dealt with grounds so to speak other than positive terminal gives voltage in, voltage out goes to negative terminal.
My only thought so far on this, is this concept:
Oh, and the real life circuit will be using two 9v batteries (for the sole purpose of having a 9v and -9v supply for each opamp in my circuit)