Given how important transistors are to electric circuits, it is unfortunate that they are easily damaged due to mishandling either by,

To further complicate the issue, it isn't easy to determine whether a transistor is blown without the support of a DMM. Fortunately, there is a simple method to determine if your transistor is working properly.

  1. Set your DMM to "Diode" (Internal diodes form an important component within a transistor and we're going to determine whether they remain viable)
  2. Take the transistor out of the circuit and place it (isolated) into the breadboard. The 3 legs should not touch.
  3. Connect the probes as shown below and confirm the suggested results for a working transistor.

Your transistor is BLOWN if,