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Handy Electronics Youtube Videos
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!! Misc. * [Testing An Electronic Circuit - Making A Circuit Board|http://www.youtube.com/watch?v=5kwvkkcOlmg] ** Static checks before live checks. ** Check +V ** Check all ground locations ** That's all (it's a short video. Notable bonus is the way the text twiddles in at the start. Obskur4tionz Styl3.) !! WA2KWL (Jonathan Gordon), who is the man: * [Tips for troubleshooting a complicated analog circuit on a solderless breadboard|http://www.youtube.com/watch?v=pIU8CeT-xBk] ** Run wires as short and parallel to each other as possible. ** Color-code wires ** Keep component leads far enough apart that they don't short ** Try to avoid going over the top of ICs ** Be aware of adjacent rows' stray capacitance ** Diagnose in stages (!) Either one at a time in sequence, or [BinaryChop Debugging|http://c2.com/cgi/wiki?BinaryChop] * [Test for Electrical Circuit Continuity|http://www.youtube.com/watch?v=bSb7KMzHde0] * [User Page|http://www.youtube.com/user/wa2kwl] * [AC Adapters|http://www.youtube.com/watch?v=ykq4GJMgpf8] ** AC-to-AC Unregulated: Just a transformer; measures higher without load than with. ** AC-to-DC Unregulated: Transformer, bridge rectifier; measures higher without load than with. ** AC-to-DC Regulated: Transformer, rectifier, filter caps, voltage regulator. ** AC-to-DC Switcher: Bridge rectifier, HV filter cap., stepdown transformer, pulse width modulator, switching transistor, rectifier diode; Probably lighter than the transformer version. [LED Semiconductor Physics Made Easy|http://www.youtube.com/watch?v=voRzyXi4CGg] * Valence shell <-> Band Gap <-> Conduction band * Energy required to move from valence to conduction band defines insulation/conduction. Home run hit vs. Cannon vs. Thump. * Silicon doping: ** Silicon has 4 valence electrons, creates strongly bound electrons ** Boron, aluminum, gallium = 3 valence electrons; dope with these and you have one electron "missing", hence P-type ** Nitrogen, Phosphorous, Arsenic = 5 valence electrons; opposite: N-type * Electrons going from N-type to P-type gives off energy: different wavelengths for different band gaps * Doping with other substrates gives different band gaps, e.g., Gallium Arsenic, Aluminum Gallium Arsenide (=Red: 620-780nm), Aluminum Gallium Phosphorous (=Green: 490-570nm) * Wikipedia elaborates (http://en.wikipedia.org/wiki/Band_gap) ** Gap is measured in Volts. ** The reverse: "the band gap determines what portion of the solar spectrum a photovoltaic cell absorbs." !! Repair: * [LCD TV repair made simple|http://www.youtube.com/user/GrantsPassTVRepairs] * [Watertown TV Repair|http://www.google.com/search?hl=en&q=watertown+tv+repair&aq=f&aqi=&aql=&oq=&gs_rfai=] !! Ellsworth: * [Debugging Bus Contention - Electronics Repair Techniques|http://www.youtube.com/watch?v=0P-s3pLClmE] !! Just interesting (as in, not necessarily useful): * [Commodore 64 Laptop Demo|http://www.youtube.com/watch?v=0AwfyBzeidk] * [Best of the SpaceLab|http://www.youtube.com/watch?v=PyZvXCQaqPA] !! Totally Irrelevant: * [Search by Image|http://www.tineye.com/] * [Villager TSBs|http://www.allworldauto.com/tsbs/1999_MERCURY_VILLAGER_technical_service_bulletins_101-573-1999-1.html]
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