Transistor tester fits into your pocket

Posted on Oct 8, 2012

It can be helpful to rapidly and easily determine the polarity (npn or pnp) and function of a transistor. The pocket-transistor tester in Figure 1 is ideal for quickly testing without regard to such parameters as gain and frequency response. You connect the transistor, or device under test, between the collectors, T, of an astable multivibrator. Thus, the VCE voltage of the device under test is alternately positive and negative.

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