DIY Atomic Clock Synced LED Clock
If you want the most accurate DIY clock possible have a look at this DIY Atomic Clock Synced LED Clock build. This clock is built to use the DCF77 which stands for D=Deutschland (Germany), C=long wave signal, F=Frankfurt, 77=frequency: 77.5 kHz. Via: LED Projects “The 77.5 kHz carrier signal is generated from local atomic clocks that are linked with the German master clocks in Braunschweig. With a relatively high power of 50