Here's a simple and quick way of testing transistors and diodes that I have
been using for years:
http://www.pic101.com/transistor_testing.htm
Rick

Lucian wrote:

> I have a multimeter with Hfe function, but didn't bother to check them,
> as I looked in the datasheet and I took from there (wrong, because of my
> mistake). But now for the future, I will both check the datasheet and
> measure the transistors, and as for the diodes, double check before
> soldering them :)
>
> Lucian
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Jinx
> Sent: 19 mai 2004 14:25
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE:] Transistor Problem
>
> > Thank you for making clear for me this very important issue !
>
> Haha, you had me wondering there for a minute. "Hmmm, what
> did Lucian see that I missed ?". Now, the tricky bit is when data
> from different sources suggest a choice of two or more pin-outs.
> The base is easy to find. Google for "testing transistors"
>
> eg http://ourworld.compuserve.com/homepages/g_knott/elect56.htm
>
> A multimeter that can measure Hfe is very useful, as a transistor that
> may appear OK resistively may have low gain and not work properly.
> Although one of my meters doesn't guarantee against damage if the
> transistor is incorrectly orientated in the socket, so I don't use that
> one
> on unknowns

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