This is a very simple power supply which can rig up at your home and power up various devices. The circuit provides +15V and +5 V supply. It can be used to power up loads which consume very less current say less than 200mA. Since we have zener regulators, line and load regulation is not that great. But it can be used to charge Ni-Cd cells or can be used as a emergency light with some white LEDs.