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Path: news.eternal-september.org!eternal-september.org!feeder3.eternal-september.org!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!nnrp.usenet.blueworldhosting.com!.POSTED!not-for-mail From: "Edward Rawde" <invalid@invalid.invalid> Newsgroups: sci.electronics.design Subject: Re: signal leads that pick up less ambient noise? Date: Fri, 21 Feb 2025 14:38:43 -0500 Organization: BWH Usenet Archive (https://usenet.blueworldhosting.com) Lines: 30 Message-ID: <vpako4$14cg$1@nnrp.usenet.blueworldhosting.com> References: <87cyfd3hpz.fsf@librehacker.com><k1acrj172rnjg5i2su95ovs9f0vcnjn69p@4ax.com><8734g9qzgu.fsf@librehacker.com> <vp7o6f$2stuq$4@dont-email.me><87tt8onssh.fsf@librehacker.com> <vp9hc3$3b68q$1@dont-email.me><87a5afnsh1.fsf@librehacker.com><vpad2m$1ndv$1@nnrp.usenet.blueworldhosting.com> <87wmdjm7pg.fsf@librehacker.com> Injection-Date: Fri, 21 Feb 2025 19:38:44 -0000 (UTC) Injection-Info: nnrp.usenet.blueworldhosting.com; logging-data="37264"; mail-complaints-to="usenet@blueworldhosting.com" Cancel-Lock: sha1:btIoKCFvsiSxwQi0B+4/agG/PAc= sha256:eCEMPP6aFrFRagvG8TTb6QQiEgwieFokhsGHgfJUdCI= sha1:k4h8ce0YMT3c675NyHB0F4LBgd4= sha256:nZCVMKWTIyvEabjCnj+QTbAWziaJOh5WV46B7FTsKso= X-MSMail-Priority: Normal X-RFC2646: Format=Flowed; Original X-Newsreader: Microsoft Outlook Express 6.00.2900.5931 X-Priority: 3 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 "Christopher Howard" <christopher@librehacker.com> wrote in message news:87wmdjm7pg.fsf@librehacker.com... >I wanted to mention that this morning I moved the old PC computer box > about ten feet away from my work station, and that reduced the noise > down immediately to about 100 mV p-p, from the original 500 mV p-p. > > After doing that, I tried running the signal from the signal generator > through a simple lowpass RC filter, with R=200? and C=1�F. This drops > the noise down some more to about 40 mV p-p. > > I also moved the signal generator closer and am using some very short > leads with alligator clips. This doesn't seem to have much effect on the > noise, as far as I tell, but it seemed like a good idea in principle. > > I like the idea of putting my analog computer inside a metal box, but I > don't currently have a spare metal box, and also that would hide all the > switches, trim pots, and terminals. I have an idea though of moving this > direction later after building some kind of patch panel. I also wonder > if it might be helpful at least to have the bottoms and sides of the > analog computer surrounded by metal, i.e., set it inside an open metal > box. Have a look at "Design Considerations" on this page: https://www.gamry.com/application-notes/instrumentation/faraday-cage/ > > -- > Christopher Howard