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Article #22380Re: Switching from 5V to 120V
From: kenny
Date: Fri, 23 Feb 1990 17:43
Date: Fri, 23 Feb 1990 17:43
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Henry Spencer writes: >Relays are possible, but the best way (my opinion) is to use a 3011 or >one of its relatives -- an optoisolator with a small triac as its output -- >to drive a larger triac. An alternative to this is something along the lines of a Potter & Brumfield OA16-66, which has a one-amp triac on board -- more than enough for the 25-watt load that the original poster envisioned. It's in a 16-pin DIP, and needs a heat sink, but the package is insulated. 5-volt relays still have the optoisolator approach beat if parts cost is the major issue, but are slow to switch, noisy (both acoustically and electrically), tend to fry driver transistors, and tend to fail at the crucial moment. I agree with Henry about optoisolators. Kevin KE9TV
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!zaphod.mps.ohio-state.edu!uwm.edu!ux1.cso.uiuc.edu!ux1.cso.uiuc.edu!m.cs.uiuc.edu!kenny From: kenny@m.cs.uiuc.edu Newsgroups: sci.electronics Subject: Re: Switching from 5V to 120V Message-ID: <21000063@m.cs.uiuc.edu> Date: 23 Feb 90 17:43:37 GMT References: <3709@uceng.UC.EDU> Lines: 17 Nf-ID: #R:uceng.UC.EDU:3709:m.cs.uiuc.edu:21000063:000:758 Nf-From: m.cs.uiuc.edu!kenny Feb 22 20:43:00 1990