alvinyow

Hi there, I'm new to this forum. Currently, I trying to built a balance - unbalance and vice versa circuit but run on a normal adapter. The adapter deliver 12Vdc only. In this case how can I power the opamp into the negative rail since I'm just having +12Vdc. I had tried using a 555 charge pump to produce the negative portion. But the current is too small to power 4 pcs of TL074 opamp, besides others circuitry too. How could I acheive this? Maybe another question here is. Is charge pump psu good for the balance - unbalance? Will it distort the signal or producing noise to it? Thanks for reading. Regards Alvin