Help wanted with a large(ish) MUX issue

C

craigyb

Active member
Help wanted with a MUX, I have an issue with a 72 channel MUX, it seems to have a problem on the range 0-127 at between 62-66 there is a pronounced jump, whereas 0-62 is fine and 66-127 is fine, but exactly at this half way point I get this jump which is annoying as it is where sliders need to be for center 0 controls etc. The MUX is constructed from 5* 4067 mux chips, each with its own analogue input, it happens if I read at 8, 10 or 12 bits resolution. This dead spot is exactly half way I guess with 63, 64 being mid point. I've built many MUX's before, even a 128 way which this is designed around and that is fine. I'm using a Teensy 4.1 and ADC to read the inputs. Here is a link to the repository, the schematic is the same as the one posted but with 3 less MUX chips

https://github.com/craigyjp/Quadra-VST-editor---Cherry-Audio
 
Thanks Mark

Thats fixed it, wonder why I never came across it before, I have about 6 or 7 multi channel analogue MUX designs under my belt.
 
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