TRANSISTOR TESTER & SIGNAL INJECTOR

  
There have been a lot of transistor tester circuits in recent electronics magazines, but this one is different. It has more features and includes a signal injector so you can test audio sections of radios and the front end of FM transmitters etc. The major advantage with this design is its automatic operation. All you have to do is fit the three leads of a transistor to the tester in any order and the LEDs will let you know the base and if the transistor is NPN or PNP.
TRANSISTOR TESTER & SIGNAL INJECTOR - schematic




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