Power an TL064CN OpAmp from USB?

Question

I want to get into electronics and I am interested in creating oscillator circuits. In one experiment I wanted to use an Opamp for an oscillator and I am now stuck with the power requirements of it. I could use two batteries to get V+ and V- but I wondered, if it was possible to use an USB power adapter instead.

In order not to fry my one TL064CN chip with its 4 opamps, that needs VCC+ and VCC-, I want to ask what I have to take care of. I learned, that I could create a voltage devider with two resistors, where the connection between the resistors becomes the GND reference and the first resistor the positive rail and the second one the negative one. Would such a simple voltage divider using two reistors be enough?

Answer 1

A very simple rail splitter. From the datasheet of TL064 it seems maximum output source/sink current is only about 3 mA (to maintain 2.5 V output at 5 V supply).

^{simulate this circuit – Schematic created using CircuitLab}

An option to increase output current would be to add a push pull output stage with an NPN and a PNP transistor pair, but that may likely introduce crossover distortion if not designed properly. Here is a very simple push pull output stage.

^{simulate this circuit}