In this paper, a trial to educate electronics for both elementary pupils and junior-high students is reported. A “making your own radio” workshop for elementary kids features a paper-craft resonator made of toilet paper cores and an empty box of tissue papers as well as solder-less main radio circuit. For elder elementary and junior-high pupils, a workshop making a bat detector (an ultra-sonic receiver) is provided to help their summer vacation research. Both workshops are planned to enlarge students wishing to knock the door of electronics. Also, we report questionnaires results for those workshops and follow up research results for bat detector workshop. Those results show that both children and parents long for good experiences on science/electronics materials and these experiences are important for future human resources in scientific fields including analog electronics.