first time question, and not much of an electrical guy. so please be patient.
My dad however, is an electrical engineer, who loves little goofy gadgets as most engineers do. For Christmas I want to get him a stirling engine, something similar to this; http://www.amazon.com/gp/product/B00DS1NLXQ/ref=s9_simh_gw_p21_d0_i5?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-3&pf_rd_r=0MB6C0MFFEPQB5NAPB9P&pf_rd_t=101&pf_rd_p=1688200422&pf_rd_i=507846 ,
however I want to use the flywheel mounted pulley to run a small generator to charge a cell phone. I know its not practical but he would enjoy it.
my question is, is there any other options besides the bike generators devices available that can help keep this package "small". the charger is rated 5v @ 2.1 amps.
another thing I wonder about is the 5volt constant, if so I cannot know for sure if the engine is capable of holding a steady rpm being an engine that rely on temperature changes to work. is there a way to use capacitors to store the power so that the charger always gets what it needs.
wow, I guess in my head this was a lot easier. if anyone can help push me in the right direction that would be great. even if the best option is to come up with a different gift idea haha.
thanks in advance guys, and take care.