Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!hplabs!hpfcso!hpldola!hp-lsd!dag From: dag@hp-lsd.COS.HP.COM (David Geiser) Newsgroups: sci.electronics Subject: Re: Lightning protection Message-ID: <7600025@hp-lsd.COS.HP.COM> Date: 27 Sep 89 18:20:35 GMT References: <11561@burdvax.PRC.Unisys.COM> Organization: HP Logic Systems Division - ColoSpgs, CO Lines: 24 In hp-lsd:sci.electronics, bam@PRC.Unisys.COM writes: b> b>The first time it got nailed, the pulse also took out the surge b>protector. I discovered (too late) that surge protectors can only b>deal with the first 200-300 volts of a spike. I didn't bother b>buying another one. Cheap ones, yes. I've seen used better ones. b>Could I rig up something with BIG caps to absorb the energy b>before it does damage (assuming BIG caps are cheaper than preamps) I would guess you're talking about using a cap to filter HF noise on the power line to ground? Use small caps. Ten in parallel are more effective than one ten times as big. You might consider a ferro-resonant power conditioner such as is sold for computer equipment. dag "You pay for what you get. Sometimes, you get what you pay for."