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Article #9024Re: question: power supply for expansion chassis
From: Mike Ardai
Date: Tue, 18 Dec 1990 16:59
Date: Tue, 18 Dec 1990 16:59
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In article <1990Dec17.004840.22780@csn.org> grusin@tramp.Colorado.EDU (GRUSIN MICHAEL) writes: [ Building an expansion chassis for an Amiga and wants to know how to hook up the new supply] Just hook up the grounds in common between the 2 supplies, and leave the other voltages separate. You should never hook supplies in parallel unless they were designed to be, since if their voltages are not *identical*, one will try to drive the other. You might want to use a relay (watch the contact current ratings), driven by the Amiga's old 5V supply to cut out the new supply's outputs in case the Amiga could be powered off while the expansion chassis is on. Most ICs don't like having their pins driven without Vcc. /mike -- \|/ Michael L. Ardai Teradyne EDA East --- ------------------------------------------------------------------------- /|\ ...!sun!teda!ardai (preferred) or ardai@bu-pub.bu.edu
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!elroy.jpl.nasa.gov!ncar!ames!vsi1!teda!ardai From: ardai@teda.UUCP (Mike Ardai) Newsgroups: sci.electronics Subject: Re: question: power supply for expansion chassis Message-ID: <18252@teda.UUCP> Date: 18 Dec 90 16:59:01 GMT References: <1990Dec17.004840.22780@csn.org> Distribution: usa Organization: Teradyne EDA, Inc. Lines: 19