This is my first Arduino project: an integrated amplifier controlled by an Arduino Uno. Everything is working, but I need to fine tune some things. By process of elimination I've found a considerable amount of noise in the audio output coming from the LED circuit which consists of a MAX7219 and 15 L…

MAX7219 noise in audio circuit

CrossRoads November 9, 2011, 6:14pm 3

The MAX7219/7221 multiplex at 800 Hz.
The slower rise & fall times, see page 4
http://datasheets.maxim-ic.com/en/ds/MAX7219-MAX7221.pdf

may help with noise.

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