Bob Schwier on Wed, 22 Jan 2003 19:06:51 -0500


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Re: [PLUG] Component Level


A transister requires three pins.  One to ground, one to voltage and the
third is the control.  In signal modifying applications, this is the one
that puts the signal in with the others doing the applications, in
switching this is the original true or false.  Feedback?
Diodes do only two pins.  Back in the bad old days of tubes, more pins
were required to take care of the capacitance caused by the massive
components.
They must be running this as a simple diode.  It does come to pass that
when you design in the shop, you use the parts that you can actually get
ahold of.  You may be looking at a hardware kludge that got enshrined in
the production model because nobody thought to correct it.
bs


On 22 Jan 2003, jeff wrote:

> On Wed, 2003-01-22 at 07:23, Paul wrote:
> > Alllll right!  The "Q4" suggested that it was a transistor, but it only 
> > uses two pins.
> 
> Does it have a top heatsink?  That might be the third pin.
> 
> 
> >   What's the "2S" for?
> 
> standard transistor designation.
> 
> 
> 
> "....computers in the future may have only 1000 vacuum tubes and perhaps
> weigh only 1.5 tons."  -Popular Mechanics, March 1949
> 
> 
> 
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