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Article #20795Re: Op amp gain control
From: jim
Date: Wed, 15 Feb 1989 18:16
Date: Wed, 15 Feb 1989 18:16
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I've seen someone use a quad analog CMOS switch (4066?) to switch a couple of resistors hooked-up like an R-2R DAC in the feedback loop. This will take fewer resistors than the 4053 and such for anything over 3 bits or so. It also works on capacitors in analog filters and oscillators if you are willing to search for nore-or-less exact values. If you need an explaination of an R-2R DAC, send mail, I'll reply. James T. Wyatt UUCP:decvax!microsoft!trsvax!rwsys!jim KA5VJL
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arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!ncar!boulder!sunybcs!rutgers!bellcore!texbell!merch!cpe!hal6000!trsvax!jimReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!unmvax!ncar!boulder!sunybcs!rutgers!bellcore!texbell!merch!cpe!hal6000!trsvax!jim From: jim@trsvax.UUCP Newsgroups: sci.electronics Subject: Re: Op amp gain control Message-ID: <190700033@trsvax> Date: 15 Feb 89 18:16:00 GMT References: <100@PSUVM> Lines: 10 Nf-ID: #R:PSUVM:100:trsvax:190700033:000:478 Nf-From: trsvax.UUCP!jim Feb 15 12:16:00 1989