David Merrill discovers unintended sound effects from an LED display:
“I didn’t realize that an LED could make *audible* sound until my friend/colleague Sajid called me over to have a look. What can I say - it’s true.. This is a circuit with NO SPEAKERS…”
Several commenters implicate the power supply, theorizing that it is switching as the current demand change. What do you think?
Watch, or more accurately listen, to the video
A version of this blog post originally appeared on Electronics Weekly’s Made by Monkeys Blog