[Re: ODP: 3rd Re: ODP: optical pots 2]

[Harry Bissell]

The "STRIP" is a liquid crystal Temperature Indicator... underneath is a shunt
resistor with varying width... so the thinnest part of the strip gets the
hottest...

Its really a power meter.  Probably not real practical. You can probably get
the film from EDMUND Scientific.  :-) Harry


Paul van Nugteren <PMvanNugteren at gmx.net> wrote:
> This would be so so very cool!
> I don't know how they do it, but I suspect you can use the strip
> only few times. Besides I have no idea how to get its formula.
> Duracell won't give it away, I'm sure
> 
> How about motorized pot? Only to drive indicator, not to use it
> as a knob. Or any other kind of motor :-)
> 
> Roman
> 


Guess what? It's a chemical reaction controlled by a current! So al we
would have to do is to put a current or voltage to the strip which has approx
the same level as the knob has. 

Any chemists on the list?


Thanks,

Paul van Nugteren

> > -----Oryginalna wiadomo¶æ-----
> > Od:	P.M. van Nugteren [SMTP:PMvanNugteren at gmx.net]
> > Wys³ano:	14 maja 1999 20:42
> > Do:	Roman Sowa
> > Temat:	3rd Re: ODP: optical pots 2
> > 
> > >         [Roman Sowa]
> > >         Once I had a dream about ring of LEDs, say, 40 around a >
rotary
> > >         encoder showing aproximate value of every parameter. I saw
> > >         something similar in mixing consoles (Neve range)
> > 
> > Do you know those DURACELL batteries which have got an indication >
strip?
> > If you push your tumb and indicator of the strip adjacent to the >
poles
> > of the battery, a chemical reaction starts an colors the strip >
yellow.
> > Well, I thought of an chemical indication like that on the DURACELLs
> > around the knobs to show their position(in software), even if they >
work
> > relativly. The strip must be very cheap, a simple redox reaction. It
> > could be glued to the surface of the sytnhs case.
> > The demands are that the chemicals should work for a long time, the
> > reaction should be quick. 
> > This could be such a great gimmick that there might be even a >
commercial
> > interest in it.
> > 
> > Later,
> > 
> > 
> > Paul van Nugteren
> 


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