[sdiy] Why transistors arent square!

[karl dalen]

You need to do things like add, subtract, integrate and differentiate. I'm thinking that would be tougher with only one input and a phase change control. Right? Wrong?

Not at all,its just amatter of using the other input as phase select. 

Besides analog computers are dead!


--- Den sön 2009-02-15 skrev Tim Parkhurst <tim.parkhurst at gmail.com>:

> Från: Tim Parkhurst <tim.parkhurst at gmail.com>
> Ämne: Re: [sdiy] Why transistors arent square!
> Till: dalenkarl at yahoo.se
> Kopia: synth-diy at dropmix.xs4all.nl
> Datum: söndag 15 februari 2009 03.38
> Hey Karl,
> 
> On Sat, Feb 14, 2009 at 2:46 PM, karl dalen
> <dalenkarl at yahoo.se> wrote:
> 
> > One thing that have puzzled me over the years, why
> arent all
> > small signal transistors made in flat square packages?
> > (some few Japanese are).
> >
> > This cumbersome half-moon shaped packaging are drag!
> > If the packages had been square, stacking and leveling
> to
> > cooling or heating surfaces would have been a breeze!
> >
> > The SOT23 are allready rectangular so why not the
> TO92?
> 
> My guess is that this is a very easy shape to make a mold
> for, and it's also
> a VERY easy finished product to get out of the mold.
> Basically it comes down
> to manufacturability. Molding technology has improved over
> the last few
> decades, but the half round is still a very simple thing to
> make. It might
> also have a slightly larger outside surface area (helps
> cooling).
> 
> 
> >
> > Another thing, why arent there any OP amps that
> behaves like
> > the inputs of the OTA? It would have been a pleasure
> to have
> > OPamps that summed into virtual ground on both inputs
> and
> > gain settable by either input or the normal minus
> input
> > in regular feedback!
> >
> > Or why not a OP amp that had one input and one phase
> select input
> > so one could switch the phase responce of the
> input/output, would have
> > been great!
> 
> Agreed, I'd love to see something like this. However,
> remember that op amps
> were originally designed to be analog computing building
> blocks. You need to
> do things like add, subtract, integrate and differentiate.
> I'm thinking that
> would be tougher with only one input and a phase change
> control. Right?
> Wrong?
> 
> 
> >
> >
> > Where have the innovation in todays semiconductior
> labbs gone?
> 
> Into making high volume parts for FCPs?
> 
> ;-)
> 
> 
> >
> >
> > Reg
> > KD
> >
> >
> Tim (easy to mold) Servo
> -- 
> "A nation cannot prosper long, when it favours only
> the prosperous." -
> Barack Obama


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