We’ve seen a tuning fork clock recently, like this 440 Hz device by [Kris Slyka] that the project above references, and whilst we’re talking about tuning forks, here’s a project log showing ...

[WilkoL’s] clock though has a most unusual clock source: a 440 Hz tuning fork. A cheap plastic dome really shows off the fork and contributes to this good-looking build. An ATTiny13 divides the ...