Smart transistor tester

There are many kinds of transistor tester. Whatever kind is used, it is imperative that the transistor is inserted correctly into the test socket. The tester described in this article contains a microprocessor that determines what type of transistor is inserted (n-p-n or p-n-p), ascertains the pinout, measures the current amplification, and then portrays the findings on a liquid-crystal display - LCD.