🚀 go-pugleaf

Duncan Barclay wrote:
> 
> In article <76ja03$gud$1@news-2.news.gte.net>,
>         Doug <do@not.spam> writes:
> > Duncan Barclay wrote:
> >>
> >> This thread started with someone (Nightjar) asking how they worked.
> >> Out of four replies I followed up on one thread was not asking how
> >
> > Getting back to NightJar ...
> >
> > BJTs can be thought of a CURRENT CONTROLLING DEVICES
> > and valves can be thought of VOLTAGE CONTROLLING DEVICES.
> >
> > BJTs offer variations in the emitter-base CURRENT controlling
> > variations in emitter-collector CURRENT.
> 
> Ahhhhhhhhhhhhhhhhhhhhhhhhhhh I give up.
> 
> This is NOT correct.
> 
> How does this explain the way a long-tailed pair works?
> 
> A BJT allows you to control a current by varying the base emitter
> voltage.

You're stuck in FET mode.  The perfect FET operates with only 
voltage on the gate whereby you have infinite input resistance.  
The gate voltage can then be the only parameter for channel 
current control.  

Your claim that the BJT is also a voltage controlled device 
does work as a model.  No one is denying that.  But, the 
effect of the voltage on the BJT is to allow current 
injection to occur.  In other words, your voltage source 
must include current.  Under the assumption that the BJT 
is ONLY a voltage device is to say that under a perfect 
model of a BJT, no current injection is the desired state. 
It is not.  Last I saw, BOTH the EM and GP models have 
current injection forms.  Gee, I wonder why ... 

But, I will not stoop quite as low as you to be quite such 
a pompous ass to tell you that you're entirely wrong.  

I simply won't do it, Duncan.  

Good day. 

And that's the end of it. 

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