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Article #5998what kind of nor gate
From: Jared Vogt
Date: Sat, 05 Sep 1992 04:17
Date: Sat, 05 Sep 1992 04:17
28 lines
2124 bytes
2124 bytes
I am working on a project involving MIDI. I would like to take 16 inputs and "Y" them down to 1 output. I don't want an active merge as this is too complicated, I want a passive system where only one input would be active at any one time. (ie. no fancy electronics to insure that the integrity of two serial signals is kept) I have figured out that with a combination of nor and nand gates I can achieve my purpose logically, now how do I do it practically. When I open up my Mouser Electronics catalogue I find that there are several different nor gates (4000, 74HC, 74LS low power schottky, 74HCT etc....) What the heck do I use. How do I figure it out? MIDI is (of course) a binary signal running at 31.25K baud - current loop, 5mA, logic 0 is current on (does this mean negative logic?). I tried this by hardwiring it together, but this caused a backwash into the audio. I then made it with a ten position switch so that only one signal was physically connected at one time. I would like this new project because I would not have to switch to any input, rather using that input would - in effect - switch itself on. In addition, I would like to add some sort of LED in the system so that when an input was active the LED would indicate which of the sixteen it was. I have been told that running the signals through 4 quad dual input nore gates and running those outputs into a nand gate would do the trick What do I need, where do I get the parts and how do I put this together. Thanks in advance for the advice. Also any advice on a simple (ie for the electronic idiot) book with simple explinations on these sorts of things? Jared elgreco@u.washington.edu
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arc1-ca.pugleaf.net!sparky!uunet!usc!sdd.hp.com!uakari.primate.wisc.edu!usenet.coe.montana.edu!news.u.washington.edu!milton!elgrecoShow Full Headers
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Newsgroups: sci.electronics Path: arc1-ca.pugleaf.net!sparky!uunet!usc!sdd.hp.com!uakari.primate.wisc.edu!usenet.coe.montana.edu!news.u.washington.edu!milton!elgreco From: elgreco@milton.u.washington.edu (Jared Vogt) Subject: what kind of nor gate Message-ID: <elgreco.715666633@milton> Sender: news@u.washington.edu (USENET News System) Organization: University of Washington Date: Sat, 5 Sep 1992 04:17:13 GMT Lines: 29