If I’m coming back before the iron age, electricity isn’t my biggest concern. All you need for a magnet is two pieces of iron to rub together, and copper is one of the easiest to work metals on Earth. Indigenous people here in Michigan were mining and working copper over 6000 years ago. Your dynamo doesn’t need to be good, it just has to prove the concept.
If I’m coming back before the iron age, electricity isn’t my biggest concern. All you need for a magnet is two pieces of iron to rub together, and copper is one of the easiest to work metals on Earth. Indigenous people here in Michigan were mining and working copper over 6000 years ago. Your dynamo doesn’t need to be good, it just has to prove the concept.