Audio Tone Circuit For Arduino Nano (Auduino Synth )

Projects General Guidance
1

I'm using the Arduino Nano for an audio project based on the "Auduino", I have modified this project Auduino 4-Step Sequencer.

Currently I am using this audio output circuit:

Nano_audioOutput_circuit
Nano_audioOutput_circuit958×304 12.7 KB

I'm looking for advice on a tone circuit with adjustable tone control, maybe replace R11 with a potentiometer? Any suggestions/advice would sincerely be appreciated.

Thank you,
TonyAme

2

R11 ts part of the low pass filter.
What would "tone control" do?

3

Yes, R11 and C1 make up the low pass filter, however I want to control the audio tone output (PWM) coming out of D3 of the Nano with a potentiometer, like a tone control on any electronic musical instrument/synthesizer.

Thanks.

4

In case anyone is following this thread, I believe I have one possible solution to a tone control for the above schematic;

The capacitor value for the tone pot with be determined via experimentation))))0000)))
controlPotForNanoSeq-9

Thanks.