At 09:21 PM 8/16/97 -0700, you wrote:
>At 11:38 PM 8/16/97 -0400, you wrote:
>
>>What am I supposed to do if I want to accurately design an amplifier without
>>guesswork?
>
>Parameters vary widely due to operating conditions and manufacturing. An
>amplifier should not rely on transistor specs to define its operation. Most
>transistor spec sheets reflect this - they will list the limits that the
>transistor can withstand, and the design is up to you.
>
>Manufacturers will also quite often target a series of parts for a specific
>use - you should familiarize yourself with them.
>
>Cheerful regards,
>
>Bob

Thanks for the reply, Bob.
I guess you are saying that it is up to the actual user of the components to
measure their characteristics. For me, there is only one problem with this,
I am at this point only an electronics hobbist. I am studying to become an
electrical engineer. I don't have the money to buy the test equipment needed
to measure all the characteristics I need to know.
I do need to know the H parameters of a transistor for an amplifier because
the input/output impedances depend upon this. I don't see how an amplifier
can avoid relying on transistor specs.
Also, I realize that most parts have a specific target use. However, even if
I know that, say, a 2N2222 is a general purpose amp, this just guides me in
choosing this component for my application. I still need to know its
characteristics.

Thanks,
Sean