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No.

Part name

Material Type

Qty

Origin

1.

PCB

Glass fiber

1

China/jiangsu

2.

FET

N-Channel Junction

1

Korea

3.

Capacitor

10PF  0402

1

Murata

4.

Capacitor

33PF  0402

1

Murata

5.

Case

Al

1

China/hebei

6.

Plastic cavity

ABS

1

China/shandong

7.

Copper ring

Copper

1

China/shandong

8.

Back electrets

ALSET FC-CNZ

1

Japan

9.

Spacer

Polyester film

1

China/shandong

10.

Diaphragm

PET

1

DuPont

11.

FELT

Cotton  decron textile

1

China/guangdong

12.

Steel mesh

Steel

1

China/shandong

13.

Adjust plate

Copper

1

China/shandong