Re: gEDA-user: Design Lab Equipment

[John Doty <jpd-atMUNGEDwispertel_dot_net>]

On Apr 3, 2007, at 6:46 AM, Dan McMahill wrote:

> Peter Clifton wrote:
>> On Sat, 2007-03-31 at 17:53 -0400, al davis wrote:
>>> How about .,,..  transistor curve tracer.  How much do they  
>>> cost?  Why doesn't every college EE department have one on every  
>>> bench?
>> I think of the old 4th-year engineering project my supervisor has  
>> in his
>> office - a valve characterising circuit. Now that's far more retro ;)
>> There are still a few out there who understand valves - and build
>> valve-amps etc. (sadly I'm not one of them, but I have a few
>> collected... I own 3x 15kW plate dissipation triodes - from old RF
>> induction heating kit ;)
>
> If you want to know enough to design audio amps with tubes, read  
> the short appendix in Electronic Principles by Gray and Searle.

Of course if you're really serious you can pick up Langford-Smith,  
"The Radiotron Designer's Handbook", Fourth Edition, either the  
original or the recent reprint.

> Assuming you know how to design with transistors, it is not that hard.

Especially MOS. I'm old enough that it works the other way: when I  
design analog MOS it brings up memories of my teenage years, playing  
with tubes. All transconductance and capacitance.

>   There are a few issues here and there though that seem to be  
> poorly documented though.  Sometime I'll post one of my favorites.
>
> -Dan
>
>
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John Doty              Noqsi Aerospace, Ltd.
jpd@noqsi.com




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