To power an op-amp with a dual supply (+Vcc and -Vcc) you can use two power supplies connected in series. I would like to find an alternative and less expensive way to do this as (in my project) the two power supplies would only power the op-amp which seems a bit wasteful.
For information the power supplies have +V, -V and GND terminals. Here is how you can create a dual power supply from two 9V batteries. You can use the same principle with bench power supplies as long as the outputs are "floating". Another option would be to use switching regulators to generate the required voltages from a 12V supply.
The ground connection is for the AC input if using a three conductor cable. Connect V- of power supply #1 to V+ of power supply #2, this will be the common connection to "ground" on the amplifier circuit. V+ on supply #1 is your +12 vdc, V- on #2 is your -12vdc. Same connections for the 24 volt supplies.
For information the power supplies have +V, -V and GND terminals. The ground connection is for the AC input if using a three conductor cable. Connect V- of power supply #1 to V+ of power supply #2, this will be the common connection to "ground" on the amplifier circuit. V+ on supply #1 is your +12 vdc, V- on #2 is your -12vdc.
Connect V- of power supply #1 to V+ of power supply #2, this will be the common connection to "ground" on the amplifier circuit. V+ on supply #1 is your +12 vdc, V- on #2 is your -12vdc. Same connections for the 24 volt supplies. Definite overkill for a preamp that only needs 50ma though.
Give a dual voltage with two 9 volt batteries. It is suitable for experiments. We can use the battery for long. Because the 741 is low power consumption. Then, see the image. Connect 741 op-amps to the 9V dual supply or split power supply.
These are 15v dual power supply circuits for a preamplifier. If you finished a Preamplifier with tone control using op-amp completely. But they need a three-terminal power supply, +15V, OV, -15V at 0.5A current. So, you have to build a 15V Dual Rail power supply schematic …