[sdiy] tubes, MOVs, etc.

[ASSI]

On Friday 15 August 2003 19:59, Glen wrote:
> Don't forget the whole "cat-whisker", vs. germanium, vs. selenium,
> vs. silicon issue. Are there any other materials in use--or formerly
> in use? Oh yeah, tubes.  :)  Any others?

Field plates, hall elements and thermoelectric stacks (aka Peltier 
elements, even though we'd be more interested in the reverse effect 
which is named after Seebeck IIRC) and then mix in some piezoelectric 
stuff. That should keep you busy for a while, when you are finally 
getting bored go on with SAW filters and figure out a way to make them 
voltage controlled, perhaps using electrorheological fluids. Bimetals 
can be used in linear fashion rather than as switches (which is 
achieved by mechanical pre-tension). Hydraulic amplifiers anyone?

If someone wants to pay my rent and feed me I can probably spent the 
next 50 years just rediscovering things that have been forgotten or 
trying to employ obscure effects that nobody cared to refine enough to 
be useful yet.


Achim.

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