Printed circuit board, waterproof microphone and production process thereof

A waterproof microphone, applied to collection of voice signals, comprising:

• a first PCB;
• a second PCB, stacked along two parallel ends of the first PCB;
• a third PCB, configured with an acoustics through-hole and located at an upper end of the second PCB;
• wherein, an acoustics cavity is formed at a space surrounded with the first PCB, the second PCB and the third PCB;
• the third PCB is formed by a plurality of substrate;
• each of the substrates is configured with an through-hole at same location and with same shape;
• an opening is formed on the PCB by interconnecting the through-holes;
• between every two adjacent ones of the substrate, a waterproof membrane is configured.

A production process of a waterproof microphone, applied to collection of voice signals, comprising:

• Step 1, providing a first PCB;
• Step 2, providing a third PCB formed by a plurality of substrates, and providing a waterproof membrane between every two adjacent ones of the substrates of the third PCB;
• Step 3, stacking a second PCB along two ends of the first PCB;
• Step 4, stacking the third PCB on the second PCB to form an acoustics cavity surrounded by the first PCB, the second PCB and the third PCB.