[sdiy] touch-sensitive switches - how?

[Benjamin Tremblay]

I eat my crow.
I should try that touch switch feature in my teensy.


> On May 2, 2021, at 7:48 PM, KA4HJH via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> 
>> On Apr 27, 2021, at 4:16 PM, Benjamin Tremblay via Synth-diy <synth-diy at synth-diy.org <mailto:synth-diy at synth-diy.org>> wrote:
>> 
>> Touch switches are easy to implement but can malfunction. I think Simonton used the same kind of CMOS touch switch you would see in a radio shack book. They usually rely upon AC hum to activate, so might not work well in a Faraday’s cage.
>> I had the old Oberheim OB-1 with touch switches. It worked very well. 
>> These days you only see them in things like lamps.
> 
> How about a cold cathode thyratron (that just happens the be a lamp as well)?
> 
> http://www.industrialalchemy.org/articleview.php?item=1084 <http://www.industrialalchemy.org/articleview.php?item=1084>
> 
> 
> The english translation of the datasheet describes it as "Intended for working with low signals and like a [sic] ionic relay.":
> 
> https://www.gstube.com/data/2119/ <https://www.gstube.com/data/2119/>
> 
> 
> Of tangental interest, here's a mains powered clock that uses them in the ring counters:
> 
> https://www.pa3fwm.nl/projects/neonclock2/ <https://www.pa3fwm.nl/projects/neonclock2/>
> 
> 
> Terry Bowman, KA4HJH
> "The Mac Doctor"
> 
> https://www.astarcloseup.com/ <https://www.astarcloseup.com/>
> 
> “...the book said something astonishing, a very big thought. The stars, it said, were suns but very far away. The Sun was a star but close up.”—Carl Sagan, "The Backbone Of Night", Cosmos, 1980
> 
> 
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