Inexspensive volume control chips

atldiyr · 3rd February 2012, 08:57 PM

I am looking for inexspenive volume control chip ideas similar to the MAX5486 chip as listed in this post: MAX5486- digi pot help!. 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.

nigelwright7557 · 3rd February 2012, 09:13 PM

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.

atldiyr · 3rd February 2012, 09:28 PM

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?

nigelwright7557 · 3rd February 2012, 09:31 PM

Quote:

Originally Posted by atldiyr

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?

I used the DIP version.
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atldiyr · 3rd February 2012, 10:03 PM

Thanks for the advice. I read your post in the digital source section regarding this chip.

counter culture · 3rd February 2012, 10:46 PM

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'

atldiyr · 4th February 2012, 11:33 PM

I'll take a look at that chip also. It sounds like a good choice for a home theater application.

3rd February 2012, 08:57 PM	#1
atldiyr diyAudio Member Join Date: Sep 2008	Inexspensive volume control chips I am looking for inexspenive volume control chip ideas similar to the MAX5486 chip as listed in this post: MAX5486- digi pot help!. 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.

3rd February 2012, 09:13 PM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	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. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

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3rd February 2012, 09:28 PM	#3
atldiyr diyAudio Member Join Date: Sep 2008	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?

3rd February 2012, 10:03 PM	#5
atldiyr diyAudio Member Join Date: Sep 2008	Thanks for the advice. I read your post in the digital source section regarding this chip.

3rd February 2012, 10:46 PM	#6
counter culture diyAudio Member Join Date: Jun 2011	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'

4th February 2012, 11:33 PM	#7
atldiyr diyAudio Member Join Date: Sep 2008	I'll take a look at that chip also. It sounds like a good choice for a home theater application.

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