I am working on a small project using sound from an Arduino Pro Mini, through a Sparkfun Mono Audio Amplifier Breakout (https://www.sparkfun.com/products/11044) to a small speaker.
It works just fine.
What I would like to do is add a mono headphone jack and have a choice of choosing, via a switch(?), whether the sound from the audio output of the amp board goes to the headphone jack or the speaker.
Any suggestions would be greatly appreciated.