Science technology manufacture homemade earthquake alarm device puzzle assembly model handmade DIY earthquake alarm equipment
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Description
Earthquake alarm principle: when shaking small production, the glass bead copper wire will contact the O-shaped lamp, the line is connected, and the buzzer will make drip sound.
First, fix the bracket with screws.
The second step: string the glass beads with copper wire, then connect the circuit, and stick the battery box on the back with double-sided adhesive.
Finally, connect the whole circuit (note that the long leg of the buzzer is positive and the short leg is negative)
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