Re: 1956 -- circuit reliability book

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#619778

From: Andrew Swallow
Date: Mon, 05 Feb 2018 01:06

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On 03/02/2018 20:04, hanc...@bbs.cpcn.com wrote:
> On Friday, February 2, 2018 at 12:14:59 PM UTC-5, Scott Lurndal wrote:
> 
>> Yes.   And Stage plays used a autotransformer to supply ring
>> current when they needed an on-stage phone to ring, but it
>> wouldn't have been connected to an "exchange".
> 
> Question: A telephone bell rings on 20 Hz, but house current is 60 Hz.
> Would a telephone ring properly and sound realistic on 60 Hz?
> 
Phone bells are low power and 90 volts. Mains is high power.

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Subject: Re: 1956 -- circuit reliability book
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References: <2884a417-2702-428f-89fb-d21cda9eeaed@googlegroups.com> <p4b4es$nmv$1@dont-email.me> <87607pwqnm.fsf@usenet.ankman.de> <o8CaC.652306$nS6.186263@fx23.am4> <p4fovt0cot@news1.newsguy.com> <4KzbC.489966$HZ5.382140@fx22.am4> <d687cecb-0383-477c-ac8e-4cf57061ccd1@googlegroups.com> <M8HbC.621680$QL6.132451@fx20.am4> <p4njj33o96@news4.newsguy.com> <TqOdncSdOJxr4u_HnZ2dnUU78IXNnZ2d@giganews.com> <c4977b5c-cc78-4773-a02f-c3cf5c191a35@googlegroups.com> <PM0005643B1039BB8A@aca42e3d.ipt.aol.com> <l01dC.3919$qv.3169@fx33.iad> <ebf8cf19-2db2-4c81-9f68-a9c2ebe96688@googlegroups.com>
From: Andrew Swallow <am.sw...@btinternet.com>
Date: Mon, 5 Feb 2018 01:06:11 +0000
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