In analog synthesis, to generate almost any signal with op amps, it is necessary to have positive and negative voltages. This allows the op amp to generate a signal that spans positive and negative voltage values.
this process is pretty simple when using 2 different power supplies, but to create it with 1 supply it is necessary to create a voltage divider, then to reverse the polarity of supply.
This instructable will inform you how to do this.
Step 1: Schematic
Here is the schematic of the voltage divider.
Note: The ground symbol is the virtual ground
Step 2: Breadboard
Breadboards are used to create solderless joints on circuits. Here is the breadboard layout for create positive and negative voltages.
Note: To create a positive voltage, use the red column and virtual ground. To create a negative voltage, use the blue column and virtual ground.
Step 3: ...and You're Away
With this, you can use this layout as a basis for all dual polarity voltage needs!