The idea of \u200b\u200bthis circuit is to power supply circuits requiring symmetrical, but using simple source, so we use an operational amplifier to create symmetric complementary push-pull output created by the two medium-power transistor TIP31C (NPN) and TIP32C (PNP), the same must be dispelled and isolated from whether it should be mentioned that the charging circuit for this converter circuit should not be a mass market, is designed to feed a logic circuit which does not demand a large current flow. There is only
device calibration, which is done through the "Linear" 50K, this control allows us to create symmetry, the value of zero bone.
For a good calibration will require a voltmeter to see positive and negative voltage (the same one he was going to feed this circuit) found once proceed to put one end of the voltmeter to the point of the device gnd Hence we must read exactly half of the tension found above mind, if you do not read it until you find the potentiometer will vary.
eg the supply voltage of 12V device, we will see between 6V + B and GND and between GND and-B-6V.
Note: Do not exceed 15V power.
The circuit is as follows: 
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