where can i find information on duplex control circuits?
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I DON'T KNO. LOOK ON GOOGLE.
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go to radioshack...they sell basic instruction manuals, circuits and all the bits you'll need
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Many.  My favorite is www.rfcafe.com since I am an electrical engineer.  Another is www.electromagnetics.biz/Index.htm  These can give you the background used in designing.
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Go to the link below and do a search for "history of electronics" or "fundamentals of electronics" and  you will have your answer.
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www.switchboard.com \n\nif you can, please know the state or just go through all of them.
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sure. go to a science store or look up schematics on the web.
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http://www.allelectronics.com
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look in switchboard.com
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Do a 'Find on this page' search for "Booth" at this link\nhttp://www.csee.umbc.edu/help/VHDL/samples/samples.shtml\n\nHope that's what you are looking for.\n///
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http://www.btinternet.com/~brentours/ENGC11.htm
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Multiplexors, Digital Cross-Connect Systems.
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www.techrepublic.com \nThis is an excellent source.  Good luck.
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http://babbage.cs.qc.edu/courses/cs341/IEEE-754references.html\n\nhelpful info\ncheck 3 links..make sure u also learn the calculations dont rely on calculators
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Check RF cafe and quizzes under the site map. Also check out the free tests on ETA international these are geared for electronic technicians but should give a good review of fundamental electronic components. \n\nEnjoy.
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http://www.networkphysics.com/products/literature/case_studies/mpls.shtml
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Try this site:\n\nhttp://www.emc.com/products/systems/DMX_series.jsp
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www.electronicsforyou.com \nor go to www.howstuffworks.com