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Article #5925Re: Freq. and Cap. meter questions
From: kenny
Date: Thu, 30 Aug 1990 17:50
Date: Thu, 30 Aug 1990 17:50
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> Is there a chip or hybrid that will convert frequency > (hopefully linear) to volts (or ohms)? Drive a 555 timer wired as a monostable. Each positive-going transition of the signal gets a HIGH output for a specific amount of time. Integrate the result, and you've got a frequency meter. For a capacitance meter, put the capacitor under test into the control circuit of a 555 astable. The output frequency is in inverse proportion to capacitance, and you can take it from there. Kevin, KE9TV kenny@cs.uiuc.edu but moving to ke9tv@nrtc.northrop.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!uwm.edu!ux1.cso.uiuc.edu!ux1.cso.uiuc.edu!m.cs.uiuc.edu!kenny From: kenny@m.cs.uiuc.edu Newsgroups: sci.electronics Subject: Re: Freq. and Cap. meter questions Message-ID: <21000092@m.cs.uiuc.edu> Date: 30 Aug 90 17:50:00 GMT References: <33045@unix.cis.pitt.edu> Lines: 15 Nf-ID: #R:unix.cis.pitt.edu:33045:m.cs.uiuc.edu:21000092:000:555 Nf-From: m.cs.uiuc.edu!kenny Aug 30 12:50:00 1990