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kalee20 · 9th Mar 2018, 4:15 pm

My clock radio (Philips, about 12 years old) has battery back-up, but the timekeeping is appalling! Whereas on mains, it's excellent. So I deduce that mains frequency is used normally, and if mains dies a simple RC relaxation oscillator is used as a clock reference.

9th Mar 2018, 4:15 pm	#78
kalee20 Dekatron Join Date: Feb 2007 Location: Lynton, N. Devon, UK. Posts: 7,088	Re: Electric clocks running slow warning My clock radio (Philips, about 12 years old) has battery back-up, but the timekeeping is appalling! Whereas on mains, it's excellent. So I deduce that mains frequency is used normally, and if mains dies a simple RC relaxation oscillator is used as a clock reference.