[dorkbotlondon-blabber] long, posh linear pots

Sarah Angliss hello at sarahangliss.com
Tue Sep 21 07:43:07 EDT 2010


Hello again

Thanks everyone for the suggestions.
@tinkernick also suggested buying an old GameTrak controller as it's  
dirt cheap and has three drawstring pots.
Right, I'm going to buy a few cheap odds and ends and see how I get  
on. I'll report back.

BTW In case any of you are interested in the other details:
For VCO, I was looking for a modern update of a synth chip such as the  
SM2038.
Peter K. mentioned the Exar XR2206 and incidentally sent these links  
to his rather fine Arduino softsynth projects, one of which is his  
version of Dudley's Voder:
http://code.google.com/p/tinkerit/wiki/Auduino
http://vimeo.com/5577046

I spotted this book from VCO cookbook which mentions the Exar XR2206.  
Am now trying to track down a copy:
http://matrixsynth.blogspot.com/2007/06/vco-chip-cookbook.html

Thanks again!

Sarah
On 20 Sep 2010, at 18:56, Adrian Godwin wrote:

> Sarah Angliss wrote:
>> Hello everyone
>> Mike and Adrian - thanks for the help - really useful.
>> I hadn't thought of making a lever to extend the travel. But I do  
>> take your point about gunk in the slider mechanism.
>> I have to say, that digital readout looks tip top - assuming I  
>> could pick the front off and get inside it, it's done half the job.  
>> I'm trying to make a Tannerin (slider instrument - sounds a bit  
>> like a theremin but isn't a Martenot - uses a pot slider on the  
>> front). So I suppose I need to find out how fast it updates the  
>> reading. Looking at the pic, it measures to the 0.01mm - if it  
>> really does that, then I don't think my ear will pick up any  
>> digitisation. I'm trying to make my Tannerin feel like the 60s  
>> original - but I don't mind if there's some sneaky digital stuff  
>> going on inside. Do want to use a proper synth-oriented VCO chip  
>> though, rather than knock something up with an Arduino or similar,  
>> as I think that'll have a big effect on the gorgeousness of the  
>> sound.
>
>
> Some good info about the scale protocols and reading rates here :
>
> http://www.yadro.de/digital-scale/protocol.html
>
>
> Also, string pots are quite simple mechanically : a 10-turn pot with  
> the string wrapped around a drum on the shaft and a tape measure  
> return-spring to reel it back in.
>
> -adrian
>
>
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