Hi, finally I did it, the circuit is working fine for my application O0
. I changed the values of capacitors and PWM frequency and I get great results.
Without the opamp connected to (-Ve) I got -4,16 Volts, and connected I got -2,60 Volts, enough to operate the opa2209.
According datasheet the Common-Mode Voltage Range in opa2209 = (-Ve) + 1,5 Volts, for me would be = -2,60 Volts + 1,5 Volts = -1,1 Volts. Which means I can operate the opamp well.
In the attached file you can find my final config. It works great for me, my amplifier arrangement finally works using a single supply and the dave's voltage inverter circuit. Experimentally I got these results:
Entry signal to amplifier = 0,019 Volts
Out Signal from the amplifier = 0,206 Volts
Theoretically amplifier gain is 11, and I got (0,206 / 0,019) = 10,84 Experimentally
.
Thank you everyone for help me out.
Thanks dave, rufus, c4757p.