if this is a standard audio amplifier your trying to modify then you will need to either motorize the current POT as described by Michael K above. or you could replace the POT with an equivalent digital POT and use the Arduino to control that .
the reason your approach wont work on a standard amp is because the actual audio is passing through the POT and being reduced in size by a resistor divider network consisting of the length of the pot and where the slider is. so you cant simply replace it with a PWM signal to manage the volume.
if it is not a standard amp then we would need far more details to be able to help. Make, Model of the amp, Pictures of the POT and its wireing etc.
if this is a standard audio amplifier your trying to modify then you will need to either motorize the current POT as described by Michael K above. or you could replace the POT with an equivalent digital POT and use the Arduino to control that .
the reason your approach wont work on a standard amp is because the actual audio is passing through the POT and being reduced in size by a resistor divider network consisting of the length of the pot and where the slider is. so you cant simply replace it with a PWM signal to manage the volume.
if it is not a standard amp then we would need far more details to be able to help. Make, Model of the amp, Pictures of the POT and its wireing etc.
