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Handy Electronics Youtube Videos
! Active Components [Very Cursory Presentation|http://www.youtube.com/watch?v=ZaBLiciesOU] * Touches on how the gate is able to make a bridge between the collector and emitter [Testing Transistors by a Very Fast Japanese Guy|http://www.youtube.com/watch?v=YsJXFLnA62s] * Model # determines NPN or PNP * Determine pins by: ** Base = leg that reads 1Ω to both sides ** Collector = leg that reads no continuity from Base ** Emitter = leg that reads continuity from Base [Haltingly Presented Analysis Prep|http://www.youtube.com/watch?v=XiiXSCQqVYg] and [...next, Common-Emitter Analysis|http://www.youtube.com/watch?v=nqefeNBcowI] * I{sub}C{/sub} = ϐI{sub}B{/sub} * V{sub}BE{/sub} = V{sub}ɣ{/sub} * Cutoff: Open, V{sub}BE{/sub} < V{sub}ɣ{/sub} I{sub}C{/sub}=0 because I{sub}B{/sub}=0 * Active: Just I{sub}C{/sub} = ϐI{sub}B{/sub} * Saturation: Short, V{sub}CE{/sub}=0, I{sub}C{/sub} = I{sub}short{/sub} * (These videos have good info, but the presentation is excruciating. Too slow at times, too fast at others. Getting to the information is like playing Frogger, there has to be a better set.) [Biasing an Audio Transistor (AllAmerican5Radio)|http://www.youtube.com/watch?v=KtXE7s5DlcI] DIY: * [N-MOS|http://www.youtube.com/watch?v=w_znRopGtbE] ** (Turns on when gate voltage is applied) ** P-type wafer, 100 crystal orientation, into furnace w/steam until oxide layer is 5k-6k Angstroms thick, [color chart|http://www.htelabs.com/appnotes/sio2_color_chart_thermal_silicon_dioxide.htm] will tell you when you're there (~6hrs) ** Active area etch silicon dioxide with HF acid ("Rust Stain remover") and vinyl mask ** Spin Phosphosilicate on wafer (e.g. using CPU fan as turntable), then kiln @ 1000 deg C, 5 min, which puts a high concentration of phosphorous onto the silicon layer ** Cool down, back in acid, etching away film, done when water beads up in active areas ** Intermediate oxide layer + drive in: 15 min in steam in furnace, stop steam, 25 min drive-in phosphorous, lowering resistance and forming PN junctions ** Etch gate oxide area (.8-1k Angstroms). Mask, open gate region. Furnace 1k degrees (w/o steam), grow thin layer (use color chart again). "Most difficult part" ** Make contacts: another mask, cut through Source/Drain, then use e.g., conductive epoxy ** Add substrate ground to get rid of parasitic PN junction !! Amplifiers [iPod Amp from Salvaged TV Parts|http://www.youtube.com/watch?v=bdCQuJHjerk] * TDA2616Q + 2A regulated 6V DC PS + Speakers + Tupperware [Op Amp primer|http://www.youtube.com/watch?v=poatR1Rjzeo] (by [sounddoctorin|http://www.youtube.com/user/sounddoctorin]) * "Op" = Performs mathematical operations * Comparator: Compares two inputs, inverting (+) and non-inverting (-) to output (will go very high if + is greater, very low if - is greater), plus voltage rail * Can hook up voltage follower (output to non-inverting side) From IRC: <hjohnson> a) there is a virtual short circuit between the + and - terminals (ie the voltage difference between them, assuming a feedback resistor, is zero) and they are also a virtual open circuit (ie, no current goes through it). Using that and KVL/KCL, you can solve almost any op-amp circuit. <Shpook> hmmm....I'd suggest a book called "op-amps for everyone" [Op Amp Design Basics - Non-Inverting Amplifier - Part 1|http://www.youtube.com/watch?v=yK9KtMeN7ts] [http://panoptic.com/rking/file/up/Op-Amp-Design-Basics---Non-Inverting-Amplifier---Part-1.png] * How to find Vo/Vs: ** R1/R2 = Voltage Divider ** Ip (Current @ Vp) = 0, because Vp has infinite impedence ** Vp = Vs(R2/(R1+R2) {therefore} Vp/Vs = R2/(R1+R2) ** ...it's losing me. I don't want to pretend like I understand and keep taking notes.
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Last changed: 2010/11/02 18:31