Re: Phones or intercoms
Yes, these generally operate as intercoms and are powered by local batteries. They are not suitable for connecting to the telephone network!
When "off-hook", pressing the ring button simply places the battery across the line, ringing the DC bell (which is connected across the line when "on-hook") of the remote unit.
When both units are off-hook, it would appear that it uses a simple series connection between the transmitters and receivers.
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Mending is better than Ending (cf Brave New World by Aldous Huxley)
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