[sdiy] Controller design

[Thomas F. Burdick]

I'd only done a quick search and hadn't found much that looked appropriate. But if you've tried both approaches, and the pressure sensor worked better for wind instruments, that sounds easier to build. I ought to be the last person in the world to doubt the benefits of integrated parts. The part you chose is relatively expensive, compared to the rest of the project. I found a Freescale differential sensor (MPXV7002 series) that looks like it would do the job and is almost 1/4 the price. Do you see any reason not to use it?
Thomas

> To: gordonjcp at gjcp.net; synth-diy at dropmix.xs4all.nl
> From: ijfritz at comcast.net
> Date: Wed, 30 Dec 2015 12:58:55 -0700
> Subject: Re: [sdiy] Controller design
> 
> You can look at my website for my breath-controller experiments to get 
> more ideas.  The discrete approach using photosensors is possible, but 
> there is alway a large amount of temperature drift.  I show an example 
> of T compensation that works reasonably well, but you really need 
> well-matched devices to get the best results.  The integrated P sensor 
> approach works much better in that recent devices have T compensation 
> built in.  But be careful -- you need to have a unit with a very low 
> pressure range, which rules out the vast majority of available devices.
> 
> Ian
> 
> http://ijfritz.byethost4.com/Stealth/st_circ.htm
> http://ijfritz.byethost4.com/SoS/sos_cir1.htm
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