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Old 31st Dec 2020, 12:41 pm   #2
Dave Moll
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Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,118
Default Re: Connecting U43 to an Electric Bell

The problem is that the bell shown is a DC trembler bell (rated, as you say, at 12V), whereas the ringing current from a telephone line is 25Hz AC at around 75V or so.

Incidentally, I am unclear what the diodes described are for.
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