Electric Light : Elenco's Diode/Transistor Tester Kit Model DT-100K

The DT-100K is a great simple tool for testing Diodes and Transistors. I also like the throw back style of the DT-100K front panel's lay out. This tool allows one to identify if a Diode is in working order and the Cathode or Anode of the Diode; more over, the DT-100K will identify a NPN or a PNP Transistor and that the Transistor is working. In the video I test out the DT-100K. First, I test that the Diode testing functioning is working properly. I start by shorting the black and red leads together (this allows me to use the internal Diode in the test) and push in the test button. The alternating LEDs are a indication of a correct response. The last part of the Diode test is to connect a diode to the red and black leads. The two LEDs indicate which is the Cathode or Anode. The black lead out-put is the left LED and the red lead out-put is the right LED. The LED that lights indicates the Cathode side of the Diode. Second, I test the Transistor Operation, I short the yellow and black leads together and press the test button (shorting allows me to use the internal PNP or NPN Transistors in the DT-100K) then vary the base current with the knob and switch between the two Transistor types. The last part of the test I use a NPN-transistor. I do this test using the yellow test socket then with the green (emitter), yellow (base), and black (collector) leads. The only modification I had to make was to add four washers to the screws that hold in the front panel. If one uses just the screws, the panel will not stay secure because the heads are too small