On Thu, 31 Jan 2013 09:07:08 GMT, Jan Panteltje
wrote:
On a sunny day (Wed, 30 Jan 2013 20:16:28 -0800) it happened "Paul
Hovnanian P.E." wrote in
:

TO-92 package markings:

"650"
"B24"

I've got dozens of them. Wondering if I can use them for anything.

Why not measure one?
PNP-NPN?
Beta
Build a curve tracer (Vce breakdown).

Which begs ( for ) the question: Has anyone attempted to develop a
method for identifying components simply from their characeristics?

Plug a BJT into a test socket, drive the pins, measure the traces,
feed the results into a database, and out pops...

"It's a 2N2222A, dummy!"

Hm... is there a way of testing ( say ) a BJT's BVce "gently", that
is, so that it doesn't _stay_ broken down?

Jes' curious.


Frank McKenney
--
Nearly every feature of the American system of manufacturing, from
the elements of the new textile machinery to the concept of
interchangeable parts, had actually been conceived earlier by
Europeans. But while a few Europeans could see the possibilities,
their communities kept them powerless to give their ideas a free
trial. Too many had a stake in the older ways. Industrial progress
in Europe required extraordinary courage to break the prevailing
pattern; in America it required a willingness to try the obvious.
American genius was less for invention or discovery than for
experiment.
-- Daniel J. Boorstin / The Americans: The National Experience
--
Frank McKenney, McKenney Associates
Richmond, Virginia / (804) 320-4887
Munged E-mail: frank uscore mckenney aatt mindspring ddoott com