I think there’s a fair few electronics experts on here.. and I’m not one of them.
I have some components ready to build a dynamo battery charger. Some of the parts (5v regulator and the USB female port for eg, also a on/off/on switch) have contact ‘legs’ or wires but I’m not sure how to figure out which is which for polarity.
I have an Evo meter so if I connect an AA to a bit of wire what’s the easy way to check the fitting or routing? Do I even need a cell for output? I think there’s an easy answer to this but I’m not sure and don’t want to risk blowing small parts.
Be careful with the regulator. I made one to power my garmin from my light battery, and turns out the basic kind simply dump all the excess power as heat which not only wasted a lot of power but made it so hot it’d burn me if I touched it.
Got 2 types of regulator, the one linked to is a more complex one that needs capacitors and a resistor and re-generates the input into the right output (so less heat as far as I understand), and a basic one that will need a heat-sink. Complex one looks to be a lot more efficient.