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NPN-PNP TRANSISTOR TESTER

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NPN-PNP TRANSISTOR TESTER Powered By Docstoc
					                                                                                      SMALL 8 OHM SPEAKER
                                                                      150




                                                                                          TRANSISTOR UNDER TEST
LEAKAGE CURRENT = APPROX 10uA
                                      0.047
                                                               0.10                               COLLECTOR
            DEVICE SELECTION                         3904
                      NPN                                             3906
                                                                                                  BASE
                                       150K
 +
3V
                                                                                                 EMITTER

                                              4148            220K
                      PNP



              CIRCUIT IS AN OSCILLATOR THAT PRODUCES A TONE IN THE SPEAKER WHEN THE TRANSISTOR TESTS GOOD




                                                                                                                DRAWN BY: DAVE JOHNSON

                                                                                DAVID JOHNSON AND ASSOCIATES
                                                                                NPN-PNP TRANSISTOR TESTER

     NPN-PNP TRANSISTOR TESTER                                               Size
                                                                               A
                                                                                     Document Number
                                                                                                       XISTRTST.DSN
                                                                                                                                       Rev
                                                                                                                                        A
                                                                             Date:   Wednesday, June 28, 2000     Sheet   1   of   1

				
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