4 ms·
I imagine the difference between DCF77 and a 50Hz clock is similar to the difference between a $40 clock and a $10 clock. :P
by jwalton 9y ago
I imagine the difference between DCF77 and a 50Hz clock is similar to the difference between a $40 clock and a $10 clock. :P
- blattimwind 9y agoRadio-controlled is pretty much the default around here (and the cheap ones cost perhaps 5 €); I think I've yet to see a grid-powered alarm clock.
- philf 9y agoHere's an IC used in some alarm clocks that uses the power grid's frequency, along with a list of products that use it: https://www.radiomuseum.org/tubes/tube_lm8560.html https://www.radiomuseum.org/tubes/tube_lm8560.html
- c3833174 9y agoIt was mostly used in the common radio alarm clocks, the ones with a 4digit red 7 segment display that were all based on an IC from the 70s that handles everything (minus the radio which is a completely indipendent module).