I have a project from my subject which that project was to create a manual generator that can produce up to 9 volts of electricity. I've been searching some samples that is homemade manual generators, but I've found they are powered only by batteries, and using a dc motor..
Is there any other samples of manual generator which is not powered by batteries or with the help of dc motor or should I say manually operated? And it can produce electricity up to 9 volts? and also can you give me the materials to be used in creating the generator?