A simple 5V DC battery power supply was built using an L7805 linear voltage regulator and a PP3 9V battery. This certainly isn’t a good way of doing things but I have a large supply of lighly used PP3 batteries so it’s what I’m going with.
SPICE Simulation of 5V regulator.
Later on, during the PCB design, I shall use a buck/boost topology and a more suitable battery.
