Trautonium – a German synthesizer invented in 1930(en.wikipedia.org)
en.wikipedia.org
Trautonium – a German synthesizer invented in 1930
https://en.wikipedia.org/wiki/Trautonium
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Doepfer’s commercial efforts at a reproduction substitutes a ribbon controller for the resistive wire. However it would appear he spent some time experimenting with this as there are notes on his page regarding it. He suggests a material called “constantan” to be wrapped around a nylon guitar string, then carefully polished to make a smooth enough surface.
https://doepfer.de/traut/traut_e.htm#2.1.%20The%20Control%20...
I use the same type of soft potentiometer they use, and I find them kind of expensive. That constantan wire sounds somewhat promising but then all that custom work of winding onto a string and polishing sounds difficult or costly. I wonder if there is some sort of fishing line or something that would have useful electrical resistance.
Also I am not sure just how much of an influence it would have on tuning stability but it looks to have been chosen because of its temperature coefficient.
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What would be a good material to use to make the wire resistor?
I currently use long soft potentiometers for building controllers but they are expensive and could possibly be more expressive if I could make my own.