Jason (jcreed) wrote,
Jason
jcreed

Having a very "to make an apple pie from scratch first you must invent the universe" sort of day. Consider contemporary popular music; its beats are still recognizably, unmistakably influenced by synthesized drumbeats from old analog synths. E.g. you could make an entire movie about just the Roland TR-808. So I look up 808 schematics and see a couple of opamps at the heart of the bass drum signal-generation module. And after a while of puzzling over it the other day, I think I feel in my guts that the behavior of an ideal opamp is pretty simple and nice, so, come to think of it, how is your garden variety 741 implemented in transistors, anyway? Oof, that looks like a giant mess. Let me just try to understand a small piece of that. Like, what's a current mirror? How does it work? I get one modelled and working in a simulator, but still kind of don't understand how it works. Time to look at analog circuits 101; how do you model a BJT transistor? I only ever knew as far as "if base voltage is high, then current flows more or less freely from collector to emitter", not quantitatively what that means as you vary voltages bit by bit.

So... now I'm reading about how external electric fields affect semiconductor band gaps. Obviously.
Tags: physics
Subscribe

  • (no subject)

    After getting home from work immediately appeared to be a traintastrophe in the making, went to see Esther Schor talk about her book "Bridge of…

  • (no subject)

    Thai curry leftovers for dinner. Got a copy of Hennessy and Patterson's textbook on Architecture, and I am enjoying catching up on all the low-level…

  • (no subject)

    Finally the end is in sight for unpacking my books. Heartstrings are pulled over the desire to slim down and get rid of some of them, but so many are…

  • Post a new comment

    Error

    Anonymous comments are disabled in this journal

    default userpic

    Your reply will be screened

    Your IP address will be recorded 

  • 3 comments