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<body class='hmmessage'><div dir='ltr'>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?<div><br></div><div>Thomas<br><div><br><div>> To: gordonjcp@gjcp.net; synth-diy@dropmix.xs4all.nl<br>> From: ijfritz@comcast.net<br>> Date: Wed, 30 Dec 2015 12:58:55 -0700<br>> Subject: Re: [sdiy] Controller design<br>> <br>> You can look at my website for my breath-controller experiments to get <br>> more ideas. The discrete approach using photosensors is possible, but <br>> there is alway a large amount of temperature drift. I show an example <br>> of T compensation that works reasonably well, but you really need <br>> well-matched devices to get the best results. The integrated P sensor <br>> approach works much better in that recent devices have T compensation <br>> built in. But be careful -- you need to have a unit with a very low <br>> pressure range, which rules out the vast majority of available devices.<br>> <br>> Ian<br>> <br>> http://ijfritz.byethost4.com/Stealth/st_circ.htm<br>> http://ijfritz.byethost4.com/SoS/sos_cir1.htm<br>> _______________________________________________<br>> Synth-diy mailing list<br>> Synth-diy@dropmix.xs4all.nl<br>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy<br></div></div></div> </div></body>
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