Misc.(Edit)

• Testing An Electronic Circuit - Making A Circuit Board
• 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:(Edit)

• Tips for troubleshooting a complicated analog circuit on a solderless breadboard
• 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
• Test for Electrical Circuit Continuity
• User Page
• AC Adapters
• 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

• 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:(Edit)

• LCD TV repair made simple
• Watertown TV Repair

Ellsworth:(Edit)

• Debugging Bus Contention - Electronics Repair Techniques

Just interesting (as in, not necessarily useful):(Edit)

• Commodore 64 Laptop Demo
• Best of the SpaceLab

Totally Irrelevant:(Edit)

• Search by Image
• Villager TSBs