I am looking for inexspenive volume control chip ideas similar to the MAX5486 chip as listed in this post: http://www.diyaudio.com/forums/analog-line-level/151171-max5486-digi-pot-help.html?highlight=max5486. I am developing a volume control solution for the line level output of an iPad. I want to keep the cost lower than that of the TI PGA2310 chip because of the possibility of wanting to produce a number of these in the future. Thanks for any ideas or suggested directions that might be good to follow.
I use the mcp4231 from microchip, its a dual pot.
If you decide to use it take care that it is always biased around 2v5 on the input and output.
Also be aware if you are using high gain after it that setting the pot to zero still lets a little sound through.
I also had some problems with pcb layout causing hum, seperating power and audio grounding is important or you will get hum if a lot of gain is used after the 4231.
I did a 6 channel mixer with that device.
If you decide to use it take care that it is always biased around 2v5 on the input and output.
Also be aware if you are using high gain after it that setting the pot to zero still lets a little sound through.
I also had some problems with pcb layout causing hum, seperating power and audio grounding is important or you will get hum if a lot of gain is used after the 4231.
I did a 6 channel mixer with that device.
That looks like a good choice especially since it looks like it comes in DIP package. Did use the DIP version of the mcp4321 and where did you order it from?
AD5204/6 has 4/6 channels, 256 positions and claims 0.004% THD. Only 10x worse than the PGA2310.
You can make it pseudo-logarithmic by adding a fixed value resistor or by selecting a limited range from the available values. Google 'pseudo-logarithmic potentiometer'
You can make it pseudo-logarithmic by adding a fixed value resistor or by selecting a limited range from the available values. Google 'pseudo-logarithmic potentiometer'
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