LM317T Voltage Regulator with Pass Transistor

I have made an electronic supply... an electronic voltage regulator, adjustable ouput voltage...entering 75 volts (more or less) unloaded, and circuit adjusts to lower voltage to feed amplifiers..... it is simetrical, so, adjusts positive and negative.... tracking error from positive supply to negative is 1 volt of different voltage under load conditions when adjusted to 50 volts (2 percent error of voltage into positve voltage compared to negative voltage under load conditions)... regulation is positive...voltage increases in the place to drop because the darlington gain and the error amplifier.... the schematic can be found in www.diyaudio.com, solid state section, Destroyer x threads, in special the Dx Power Supply.



http://www.youtube.com/watch?v=ocVA90cPUhE&hl=en