How to make a 10 band audio equalizer controlled by 10 analog pot, using an adau1701 and two CD4051

Hello nff,

I have to answer this quickly due to the weather! I could lose power any moment.

I have attached a project where I used a single AUXADC pot to control eight different levels. It uses an external MUX

So this is some of the things you will have to do.

I may have another project which is closer to what you need to do but I have to ask someone else in the company that I think built something like you are describing.

So I apologize for the partial answer but this should get you started.

There are also some other posts which comes close to what you are trying to do.

ADAU1452 index selectable mux from AUXADC - Q&A - SigmaDSP Processors & SigmaStudio Dev. Tool - EngineerZone

Multiple External Potentiometers - Q&A - SigmaDSP Processors & SigmaStudio Dev. Tool - EngineerZone

ADAU1701 difficulty with index-selectable demux - Q&A - SigmaDSP Processors & SigmaStudio Dev. Tool - EngineerZone

Dave T

5826.ADAU1701 AUXADC External MUX Example 8 to 1.dspproj

Hi Dave, did your electricity hold up? I lost mine, with the temp. in my home down to 48 F. before power was restored. How much snow did you get?

hello Dave, i hope you are doing well, thank you very much for your help, and for your videos in youtube, those were my introduction to this world. i will take a look and post some advance in a few days.

best regards

Erick T

Hello Bob,

I did lose power twice, not too long after I posted the above response and then later in the day but both times it lasted like three minutes! I did not even start to head out to the garage to fire up the generator! So I was lucky. Also, the snow totals reduced quickly on the north side of the storm. Boston got like 24" but I got a hair under 10" here in Southern New Hampshire.
I know in your neck of the woods it was much worse snow and wind. So no surprise you had it rough!

Dave T

well, i make a prototype that should work, using the idea from 5826.ADAU1701 AUXADC External MUX Example 8 to 1.dspproj, and using 10 selectables index filters, with 10 filter each, 2dB steps. this two ideas works well by themself, but when i tried to put everything on a single program it send an error of MIPS, about 1500 MIPS and at 48Khz and i just have about 1000 MIPS. so i think is impossible to do this without an external microcontroler.

i will have to do it with the help of an arduino. if you have some other idea to reduce the mips they are welcome!!!

thanks for your help Dave, i hope you are doing OK.

Erick T.

https://drive.google.com/open?id=1lXo9uZFLeR5UB0rUUaXEMcribUJyiJox&usp=drive_fs

there i put the link of 2 version of my program. one is complete with the 10 band, but it need 1425 MIPS, and the other i reduce the number of bands to 5 so it can compile and run, just to probe that the idea works. if somebody can see it and give some advice to reduce the number of MIPS i will be very happy. thank you.