HI, I’m trying to make a dual +/- 15 volt 100mA power supply. I using 7815 and 7915 regulators, with a center tapped transformer. The transformer has two 20V outputs rated as 100mV each, and a center 10V output that I am using as ground. The circuit uses a full wave rectifier and 2200uF electrolytic caps on the input and .1uF on the outputs of the two regulators. When the circuit is turned on I get the expected +/- 15 volts, the strange thing is if I put even a small load of 5-10 mA, the voltage of the regulator sag by a volt, and if I increase the load to over 20mA they go completely out of regulation. I’m scratching my head over this, can someone suggest an explanation or a fix?