A friend of mine has an old 70-ies camera that uses mercury batteries to power the light metering. And as we all know, mercury batteries are bad for the enviroment, mmkay, and above all hard to find. So. What I'd like to do is to rebuild the camera to use standard lithium batteries, but I'd need some sort of voltage regulator to keep the light metering calibrated (the voltage level constant until the battery is drained). What I'm trying to get to with all this rambling is:
Do you have any suggestions where I could find such regulators?
I've gotten a suggestion to use a battery with more voltage than I need, and to use a resistor. Being an electronics newb, what would the main difference be? How would you guys tackle this?