Article View: sci.electronics
Article #15755Re: XMAS Lights Theft Alarm
From: Todd Inch
Date: Thu, 17 Dec 1992 21:12
Date: Thu, 17 Dec 1992 21:12
17 lines
1445 bytes
1445 bytes
In article <1992Dec10.182447.16893@vpnet.chi.il.us> cgordon@vpnet.chi.il.us (gordon hlavenka) writes: >>>... The device would work by detecting the AC current being >>>consumed by the lights, then triggering an alarm if it drops below a certain >>>point. > toddi@mav.com (Todd Inch) writes: >>This will be very nearly impossible with parallel-wired (C-7 or C-9) bulbs, and >>still difficult with series-wired mini lights. Here's why: > >But you don't need to look at a steady-state current, just a sudden >change. This should be pretty simple to spot. Hmm, didn't think of that. But what if the bulb is disconnected when the AC is at/near 0 Volts? I suppose that if the bulb is mechanically disconnected, the disconnection would generate some noise that might last long enough for the voltage/current to rise again (e.g. essentially switch bounce)? And of course, twinkle-lights just wouldn't do :-).
Technical Details
Message-ID:
<1992Dec17.211226.9348@mav.com>Path:
arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!saimiri.primate.wisc.edu!usenet.coe.montana.edu!news.u.washington.edu!uw-beaver!fluke!gtisqr!toddiReferences:
<ByoqLt.DLJ@waterloo.hp.com> <1992Dec08.215021.18099@mav.com> <1992Dec10.182447.16893@vpnet.chi.il.us>Show Full Headers
Complete Article Headers
Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!spool.mu.edu!sdd.hp.com!zaphod.mps.ohio-state.edu!saimiri.primate.wisc.edu!usenet.coe.montana.edu!news.u.washington.edu!uw-beaver!fluke!gtisqr!toddi From: toddi@mav.com (Todd Inch) Subject: Re: XMAS Lights Theft Alarm Message-ID: <1992Dec17.211226.9348@mav.com> Organization: Maverick International Inc. References: <ByoqLt.DLJ@waterloo.hp.com> <1992Dec08.215021.18099@mav.com> <1992Dec10.182447.16893@vpnet.chi.il.us> Date: Thu, 17 Dec 92 21:12:26 GMT Lines: 18