Audiomixer
Started by
kenNET
, Dec 27 2011 11:38 AM
6 replies to this topic
#1
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
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
#4
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
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
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
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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