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用压电陶瓷做的晶体管测试仪,可根据压电陶瓷片发出的声响来简单判断被测晶体管的好坏。电路如图a,压电陶瓷
Transistor made of piezoelectric ceramic tester, according to the piezoelectric ceramic sound emitted to a simple judge of the transistor under test is good or bad. Circuit shown in Figure a, piezoelectric ceramic