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Audiomixer


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#1 kenNET

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Posted 27 December 2011 - 11:38 AM

Hi, I got an crazy idea, I want to build a audio mixer that is controlled by Netduino. So I'm looking for a IC that simply is a "volume control" that can be controlled from Netduino like Ic2 or byte? But only I found so fare is analogue one: TDA1524AN. Any suggestions. /Ken

#2 kenNET

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Posted 27 December 2011 - 11:46 AM

I did find a potential IC, not really sure if I can control it from Netduino. It's for one audio channel, so for a 4-channel mixer I will need 8 of this. MAX5407 http://datasheets.ma.../ds/MAX5407.pdf

#3 Mario Vernari

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Posted 27 December 2011 - 05:42 PM

Why not the DS1801?
Biggest fault of Netduino? It runs by electricity.

#4 kenNET

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Posted 27 December 2011 - 06:03 PM

After some thinking I see what I need a digital potentiometer to replace a volume potentiometer in a audio mixer, a 10kohm pot. I could properly use the DS1801, better is a quad pot. And for lab I prefer DIL casing.. What I understand is that most are controlled by 3-wire (SPI ?). So my question is can I control many digital potentiometer via SPI or just one with Netduino. /Ken

#5 kenNET

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Posted 27 December 2011 - 06:20 PM

OK, more digging... I found two good candidates, one 129-steps and one 256-steps digital potentiometer at 10kohm for good money. I think these will work fine. Now how do I control a bunch (5-8) of these with Netduino, can I do that? http://se.farnell.co...ip14/dp/9758615 http://se.farnell.co...-spi/dp/1578436 /Ken

#6 JonnyBoats

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Posted 27 December 2011 - 07:26 PM

For an audio device you most likely want a logarithmic rather than a liner taper. In looking through the data sheet (quickly), figure 2-2 (page 17) seems to show this as a linear taper.

OK, more digging... I found two good candidates, one 129-steps and one 256-steps digital potentiometer at 10kohm for good money.

I think these will work fine. Now how do I control a bunch (5-8) of these with Netduino, can I do that?

http://se.farnell.co...ip14/dp/9758615
http://se.farnell.co...-spi/dp/1578436


/Ken



#7 kenNET

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Posted 28 December 2011 - 10:24 PM

I found some code example, now I just have to find that IC... http://nerduino.word...l potentiometer /Ken




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