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May han thiec hay con goi la may han sung. Cau tao gom mot quan day so cap va 1 quan day thu cap. Tuc la 1 quan nhieu vong day thiet dien day be, quan kia thi it vong hon nhung day to hon. Quan quanh nhung mieng sat non dc ngep lai voi nhau.
Che tao. Tien hanh do
Gom 250 vong day soi nho va 20 -25 vong day soi to. Nhung tam sat lon hinh C vuong hoăc E. Theo toi phan nay chi can 2 cai cuc sac den pin co 5.7v la ok. 2 thanh kim loai to duc 2 lo dau va dit 4 oc de van vao lo 4 dau thanh kim loai.
2 cuc sac 5.7v thao ra ta thao tung tam sat lon ra ta dc nhung tam hinh chu E va I, 2vong day quan quanh 1 quan nhua phan nay chi thao dc tam dau la ra het. Lam tuong tu voi 2 cuc. Ta lay tam sat hinh E dung kim be chan giua di thanh C vuong. 2 quan day cua 2 sac mot quan thao het day lay khuon nhua. ta de sat vao nhau va xep cac tam sat hinh C va I vao sao cho vua thanh kinh vuong nhu ban dau. Quan vong day 20-25 vao loi 2thanh kim loai dong vao vong lay la ok. Con cac buoc con lai thi cac ban lam lot.
2 cuc sac 5.7v thao ra ta thao tung tam sat lon ra ta dc nhung tam hinh chu E va I, 2vong day quan quanh 1 quan nhua phan nay chi thao dc tam dau la ra het. Lam tuong tu voi 2 cuc. Ta lay tam sat hinh E dung kim be chan giua di thanh C vuong. 2 quan day cua 2 sac mot quan thao het day lay khuon nhua. ta de sat vao nhau va xep cac tam sat hinh C va I vao sao cho vua thanh kinh vuong nhu ban dau. Quan vong day 20-25 vao loi 2thanh kim loai dong vao vong lay la ok. Con cac buoc con lai thi cac ban lam lot.
*Chu y: neu cam vao ô 220v ma thay dien sut manh va lo toe anh dien lap tuc dut ra. Toi ko chiu trăch nhiêm. Hihi

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