I've made a circuit that needs a power supply adjustment. It works fine: 15v and 200-300ma max 5W but its potentially unsafe. I've reduced the power supply requirement to 5V but I don't know what max current to give it. The circuit is just 2 parallel circuits each with a ballast resistor. So what power supply characteristics should I keep in mind about the replacement ps? The schematic below has 5V for the voltage source now, it was 15.