[sdiy] Controller design

[Ian Fritz]

Yeah, those guys are expensive.  It looks like the Freescale device you 
turned up should work fine.  If I read it right it will do both positive 
and negative pressure, so that would be a plus for your application. 
I'm guessing they might use these for puff-n-sip controllers. Just be 
careful not to overpressurize it!

Ian

On 12/31/2015 3:57 AM, Thomas F. Burdick wrote:
> 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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