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From: gnome@oliveb.UUCP (Gary Traveis)
Newsgroups: net.consumers
Subject: Re: Loud telephone clicks
Message-ID: <374@oliveb.UUCP>
Date: Thu, 28-Mar-85 14:42:03 EST
Article-I.D.: oliveb.374
Posted: Thu Mar 28 14:42:03 1985
Date-Received: Tue, 9-Apr-85 00:39:44 EST
References: <7583@rochester.UUCP>
Organization: Olivetti ATC; Cupertino, Ca
Lines: 31

> From: Jim Mayer  <mayer>
> 
> Most (all?) of the telephones I use produce loud, sharp, clicks while
> making connections.  I find the clicks very anoying, and often actually
> painful.  Holding the phone away from my ear works, but sometimes
> (depending on the quality of the connection) makes it hard to hear when
> the call is answered.  Does anyone knows of a product or a trick that
> might help?
> 
> I would think that a low pass filter could be fitted in the circuit
> somewhere to deaden the clicks; if it interfered with voice quality too
> much it could be set up with a bypass switch.  Alternately, and much
> more (too) expensively, I have heard of a black box that helps suppress
> pops and scratches in old records -- it cuts them out of the signal and
> substitues a snippet of the adajacent signal.
> 
> -- Jim Mayer					University of Rochester
> (arpa) mayer@Rochester.ARPA			Department of Computer Science
> (uucp) rochester!mayer				Ray P. Hylan Building
>        (via allegra, decvax, or seismo)		Rochester, New York 14627

What you really need is a thing called a DIAC.  DIACs are used in
all Bell phones.  They are supposed to be connected across the terminals
of the earpiece in order to clip all high amplitude impulses.

DIACs are basically two low-voltage Zener diode hooked up contra-parallel.

I am not sure where you cold find them in your area.

Gary
(hplabs,ihnp4,allegra)oliveb!olivee!gnome