I need a differential amplifier circuit for my design and I am using the LM358 op-amp. The problem is of negative supply. I need to give negative power voltage to my op-amp(-Vcc). and I only have a 9v battery. I found a way to genrerate negative supply voltage using 555.
However as soon as I cinnect my differential amplifier to the circuit the negative voltage drops from -7.9 to -6 volts. (Some drop was expected but this is too much for my application).
Is there a way I can regulate or stabilize the negative voltage. ?
Here is the comlete schematic.