Line status indicator

Line status indicator As shown in the drawings, when the line is normal, H1, H2 emits glow, H3, and H4. When the fuse on the fire line is blown, the H3 illuminates and H2 is extinguished. When the fuse on the zero line is blown, H4 is emitted, and H2 is turned off. When the two fuses are blown, H2, H3, H4 are not bright, and H1 is still lit. When H1, H2 illuminates, the electrical appliance does not work normally, indicating that the line after the electrical or H2 has failed. After the fuse is fed, H1 can also be used for indoor micro-light lighting, and the user is safe to replace the fuse. When making, the neon lamp can be used in the 氖光 氖 氖 in the sunlight, and the electric power is applied to the electricity. It is more easy to observe if you stick to the color paper outside of 氖. Technology area Ways and steps of self-made simple buzzers in one text Make charging treasure with idle mobile phone battery Simple water level alarm production _production simple water full alarm Electronic tube frequency band Winding method for self-made electric welding machine

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