> Can you make a basic transistor with 2 diodes?

No

> 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

Many many years ago I had a very simple setup for tests: a 6.3 Volt
trafo (that particular voltage alone says a lot), two light bulbs with
series diodes, these two combo's places anti-parallel, connected to one
line of the trafo and one test lead, other trafo line is the other test
lead. The two test leads can be used directly to identify shorts,
diodes, and the diodes that are inside a transistor.

With a little more effort the C and E of a transistor can be
distinguished: put the test leads on the C/E (the base is identified
first via the diodes). Now use your finger as a resitor between B and
one of C/E, and then the other. The one that causes the one light to
shine brightest is C.

Wouter van Ooijen

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Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products

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