I am trying to use an ecg 957 voltage regulator in place of a LM317T radio shack voltage regulator. They both have about the same specs, but the ECG 957 is -1.2V to -37V instead of poitive voltages. I am building a basic power supply, and I am thinking I will have to change the connections around from the bridge rectifier, and change the polarities of the capacitors in paralell between the positive and negative sides of the rectifier. as well as the led direction. I know this is hard to answer without a schematic, but can anybody help me? I can email the schematic to anybody if needed.