[sdiy] Transistor help

[Bob Weigel]

Hehe.  I think he just means it is technically not the way to be sure.  
Obviously there are normally going to be strong relationships if they 
had any kind of consistency in the chip manufacturing process 
minimally.  But the way suggested is more proper since it takes into 
account the actual things which are going to affect the performance of 
the circuits in question usually. -Bob

Ian Fritz wrote:

> At 11:16 AM 4/26/05, René Schmitz wrote:
>
>> hFE is not the right way to select matched pairs.
>
>
> Did you ever try it? :-)
>
> I have found a strong correlation between hFE and Vbe at constant 
> current.  I say it works OK!  And much easier than building a special 
> circuit.  Remember, an hFE function on meters was not common 25 years 
> ago.
>
>   Ian
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