Re: Query - How valves and transistors work - Article 15447 - go-pugleaf

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Article #15447

Re: Query - How valves and transistors work

#15447

From: Doug
Date: Wed, 30 Dec 1998 00:00

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Duncan Barclay wrote:
> 
> In article <76b08g$jo4$1@news-1.news.gte.net>,
>         Doug <do@not.spam> writes:
> > Nightjar wrote:
> >>
> >> Could anybody out there tell me how valves and transistors work, please? I
> >> would be eternally grateful.
> >
> > In a couple of sentences or less?
> >
> > Valves are voltage devices.  You can control a relatively
> > large voltage with a small amount of voltage.
> >
> > Transistors are current devices.  You can control a relatively
> > large current with a small amount of current.
> >
> 
> Sorry, you are wrong twice. Both valves and transistors (BJTs and FETs)
> are voltage controlled current sources.

They *could be* modeled any one of several different 
ways without regard to transfer impedences.  

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From: Doug <do@not.spam>
Subject: Re: Query - How valves and transistors work
Date: 1998/12/30
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