Schachuhr (LEDs)

This transistor tester is not intended as a fully-fledged measuring instru-ment; it can be used when a general indication is required of the lc/Uce characteristic of a transistor. Further-more, it is sufficiently reliable for use when looking for `matched pairs`. Only NPN transistors can be tested, as well as diodes. Obviously, an oscilloscope with separate X-and Y-inputs is required.