How-To: Transistor tester

How-To: Transistor tester


(photo by Michael L.)

Though some of the fuller featured multimeters offer similar abilities, this ATMega8-based transistor tester project, identifies pins, measures gain, plus resistance and capacitance. Looks like a welcome addition to the workbench – schematic + source code can be found here [via Electronics-Lab]

4 thoughts on “How-To: Transistor tester

  1. Esko says:

    This awesome device can test and identify all sorts of transistors,
    including the pin assignment:

    * NPN&PNP (+darlington) showing hFE and base-emitter forward voltage
    * depletion and enhancement P/N-MOSFETs showing Gate capacitance and threshold-voltage
    * N-JFET & P-JFET
    * Thyristor & Triac
    * Double Diodes (Common Anode/Cathode, 2 in series or parallel)
    * Resistors & capacitors

    For transistors it shows whether a protection diode is present.

    There is an ongoing discussion in this german board. English comments are welcome:


  2. Jack says:

    Looks like a great project. I’m always interested in various ways to test electronics.

    If you want a kit to test a wide range of semiconductor devices, check this out. I use it on a regular basis, and highly recommend it:

  3. Jose A Ortiz says:

    Where is the schematic?

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