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Article #1517Alternative to dual pots
From: NEIL GANDLER
Date: Mon, 03 Aug 1992 01:48
Date: Mon, 03 Aug 1992 01:48
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I recently wrote in asking about dual audio pots but just discovered an alternative. The key is a simple multiplexor using the versatile 4066b cmos I.C. I simply allowed two channels of audio to share one channel of resistance alternately switching between the two. Normally you would hear distortion or audio noise or clicks but I used an inverter for one of the channels and a 555 to provide a high frequency signal using a 10pf cap to run at extremely high frequencies. It works! Im not sure if its anything inovating or new but it just made designing my stereo receiver that much easier. I no longer have to search for hard to find and expensive pots. The multiplexor circuits costs less than $3. I welcome any comments or questions. Neil Gandler
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Path: arc1-ca.pugleaf.net!sparky!uunet!cs.utexas.edu!rutgers!ub!acsu.buffalo.edu!ubvmsb.cc.buffalo.edu!v064mb9k From: v064mb9k@ubvmsb.cc.buffalo.edu (NEIL GANDLER) Newsgroups: sci.electronics Subject: Alternative to dual pots Message-ID: <BsDu8n.6zC@acsu.buffalo.edu> Date: 3 Aug 92 01:48:00 GMT Sender: nntp@acsu.buffalo.edu Organization: University at Buffalo Lines: 14 News-Software: VAX/VMS VNEWS 1.41 Nntp-Posting-Host: ubvmsb.cc.buffalo.edu