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Article #7490Re: Need analog opto-isolator or equiv.
From: Rick Lotoczky
Date: Thu, 27 Sep 1990 22:37
Date: Thu, 27 Sep 1990 22:37
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> In article <222@nachos.SSESCO.com> elmquist@nachos.SSESCO.com (Chris Elmquist) writes: > >Does anyone have a nifty circuit that will replicate a 0v to 5v DC > >signal across an opto-isolated path..?? ... > >I've thought about serial A/D and D/A chips... but I haven't > >found any that use the same data format over the serial link... > Another way to do it would be to send a pulse width modulated signal through an opto-isolator to a low pass filter on the other end. The LPF will convert the PWM to an eqivalent analog signal. You will most likely have to linearize this circuit, but that can be easily done in software. I don't know what kind of accuracy you need, but 0.5% or so should be attainable. rick -- Structured Electronic Systems, Inc. | ...uunet!mailrus!sharkey!cfctech 650 Red Oak Lane | !rphroy!trilby!sesi!rick Rochester, MI 48063 | (313) 652 4809 |
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arc1-ca.pugleaf.net!utzoo!attcan!uunet!zephyr.ens.tek.com!uw-beaver!mit-eddie!wuarchive!zaphod.mps.ohio-state.edu!sdd.hp.com!caen!math.lsa.umich.edu!rphroy!trilby!sesi!rickReferences:
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!zephyr.ens.tek.com!uw-beaver!mit-eddie!wuarchive!zaphod.mps.ohio-state.edu!sdd.hp.com!caen!math.lsa.umich.edu!rphroy!trilby!sesi!rick From: rick@sesi.UUCP (Rick Lotoczky) Newsgroups: sci.electronics Subject: Re: Need analog opto-isolator or equiv. Summary: Another way Message-ID: <834@sesi.UUCP> Date: 27 Sep 90 22:37:22 GMT References: <222@nachos.SSESCO.com> <1990Sep25.153656.2704@zoo.toronto.edu> Organization: Structured Electronic Systems, Inc. Rochester, MI Lines: 19