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Article #619781Re: 1956 -- circuit reliability book
From: hanc...
Date: Tue, 06 Feb 2018 21:02
Date: Tue, 06 Feb 2018 21:02
11 lines
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2458 bytes
On Tuesday, February 6, 2018 at 4:55:35 AM UTC-5, Andy Burns wrote: > Simon Turner wrote: > > > I have no experience of US phone bells, but UK ones certainly don't > > sound right if they are rung with the wrong frequency (50 Hz from the > > mains rather than the 25 Hz they are expecting) > > I thought they were 17Hz? Though it's a long time since I heard a phone > with a bell, apart from as an MP3 ringtone ... In the U.S., landline ringer frequency is 20 Hz.
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