Article View: sci.electronics
Article #5017PC Power ON/OFF Scheme
From: uchuck
Date: Mon, 09 Jul 1990 21:20
Date: Mon, 09 Jul 1990 21:20
17 lines
1356 bytes
1356 bytes
Gentlemen, I have devised a scheme using a high current capacity relay and a couple of small control relays that will allow me to power up or down my PC system and peripherals simultaneously. The design includes a power fault - no power back up feature so that the machine does not try to go through power up/down sequences that are not purposeful. In addition, by the use of a DPDT main relay with the PC and its peripherals on the moving contacts and the power line on the normally open contacts, I had the idea of connecting the normally closed contacts together and then to ground in the hopes of preventing any lightning hits getting to the PC. Now, I begin to wonder... What is the effect of shorting the power cord(s) of the PC and associated equipment together and to ground, even under normal (read operator induced) conditions???? Can anyone think why this might be a problem?? Chuck Bennett
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arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!rutgers!mcnc!ecsgate!uncmed!uncmed.med.unc.edu!uchuckShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!rutgers!mcnc!ecsgate!uncmed!uncmed.med.unc.edu!uchuck From: uchuck@uncmed.med.unc.edu Newsgroups: sci.electronics Subject: PC Power ON/OFF Scheme Message-ID: <334@uncmed.med.unc.edu> Date: 9 Jul 90 21:20:10 GMT Sender: news@uncmed.med.unc.edu Reply-To: uchuck@uncmed.med.unc.edu () Distribution: usa Organization: UNC-CH School of Medicine Lines: 17