https://toshiba.semicon-storage.com/jp/semiconductor/knowledge/faq/mosfet_common/i-heard-that-a-junction-fet-could-be-used-as-a-constant-current.html
ʂ̃TCgɃWv悤ƂĂ܂BXΏL̃NNbNĂ
UPLIFTōLȂő̌܂傤IKȉ{Ct܂I