Newsgroups: sci.electronics
Path: utzoo!henry
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: Ring signal generation (was DTMF Decoder IC)
Message-ID: <1990Oct10.151422.6001@zoo.toronto.edu>
Organization: U of Toronto Zoology
References: <14793@mentor.cc.purdue.edu> <27114b84-483.1sci.electronics-1@vpnet.chi.il.us> <14913@mentor.cc.purdue.edu> <9770@uhccux.uhcc.Hawaii.Edu>
Date: Wed, 10 Oct 90 15:14:22 GMT

In article <9770@uhccux.uhcc.Hawaii.Edu> whinery@hale.ifa.hawaii.edu (Alan Whinery) writes:
>To emulate this? Your ringer would probably eat 60 hz, but you'd have to 
>knock down the voltage a little, and it would sound funny. The likelihood
>that there is a high Q 20 hz filter in a phone is relatively slim. ..

Unfortunately, there is:  "classic" phones have mechanically-resonant
ringers that really do want something fairly close to specs.  (What, you
were expecting an *electronic* filter?  Don't be silly. :-))  What the
cheap electronic phones will take is another question.
-- 
Imagine life with OS/360 the standard  | Henry Spencer at U of Toronto Zoology
operating system.  Now think about X.  |  henry@zoo.toronto.edu   utzoo!henry