How to use single supply to power opamps that need dual supply?

[zanov]

I have 1 battery 9V and must have opamps of single supply. Why I have to connect everything of stating ground in schematic to (-) polarity of battery?

How I can come around using 1 single 9volt battery to be used with a PIC microcontroller for the gound pin. I use 7805 regulator to get 5volts to PIC.

 

[flatulent]

Re: single supply

Your idea is commonly done. The two ends of the battery and an "artificial ground" from the 5 V regulator output. All analog signals will be referenced to the 5 V level. If you use AC coupling in and out, the analog signals can be referenced to the - side of the battery which is also the ground of the digital circuitry.

 

[ahmed osama]

Re: single supply

Well i guess you mean how to use the op-amps which need dual power supply ,well for this case there is some ct. which makes dc-dc converstion so some ct take the 9v and converts it to +4V , -4V and GND ofcourse

 

[zanov]

single supply

Flatulent is more exact to use regulators. Ahmed you are right but I do not need such level of complexity for now.