Article View: sci.electronics
Article #17520Re: I need a telephone ring detector chip
From: greg
Date: Mon, 27 Apr 1987 21:59
Date: Mon, 27 Apr 1987 21:59
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In article <565@inuxh.UUCP> rmrin@inuxh.UUCP (D Rickert) writes: >Ten megs will not cause any problems. I would suggest builiding a circuit >such as this in a metal box to guard against component overheating in the >event funny voltages get on the phone lines. In order to dissipate 1/4 W in a 10M resistor, you have to apply 1,581 V across it. And the 10M resistor will dissipate 98% of the power in the circuit. The capacitor will fry long before the resistors get warm. -- ---------------------------------------------------------------------- Greg Smith University of Toronto UUCP: ..utzoo!utcsri!greg Have vAX, will hack...
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!utgpu!utcsri!greg From: greg@utcsri.UUCP Newsgroups: sci.electronics Subject: Re: I need a telephone ring detector chip Message-ID: <4683@utcsri.UUCP> Date: Mon, 27-Apr-87 17:59:35 EDT Article-I.D.: utcsri.4683 Posted: Mon Apr 27 17:59:35 1987 Date-Received: Tue, 28-Apr-87 00:59:16 EDT References: <228@phoenix.PRINCETON.EDU> <7940@utzoo.UUCP> <441@haddock.UUCP> <565@inuxh.UUCP> Reply-To: greg@utcsri.UUCP (Gregory Smith) Organization: CSRI, University of Toronto Lines: 15