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!! 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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