I assembled a model of my daughter’s first car, which was a header-orange Challenger. Although not the charger from the TV show, it looks like it, and so I assembled a board that plays “Dixie” when you press a hidden button.
You could do the same, so it plays what the audio waveform represents when pressing a discreet button.
That is an awesome idea! I agree that a waveform without the ability to hear it isn’t as powerful of a message.
I wish I could have used a button push, but it isn’t a short message and anything battery powered won’t last.
I didn’t post the back of the plaque because it was a personal message from each of the family members. (The engraving is all if them layered on top of one another -you can see them really well if you zoom in!) The good stuff is all on the back on a beautiful piece of maple
I cleaned up, combined, and then hosted the recording on their google drive and made a QR code link to it. Then I engraved a transcription of each of the messages and the code.
Here’s a trimmed version of the photo of the back.
It looks beautiful on the black acrylic background!
What I used is a standalone MP3 player circuit board with an SD card slot, it will play as long as you can fit on the card - although in my case, it’s only a few seconds. The same 9V battery has powered it for several years now.