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starsandrobots's profile
Star Simpson
Star Simpson
Star Simpson
@starsandrobots

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Star Simpson

@starsandrobots

I like to build things. Glider pilot. Eyes bigger than bookshelf.

SF Bay
Joined January 2009

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    Star Simpson‏ @starsandrobots 7 May 2016

    Getting my kicks asking electrical engineers to explain, verbally, how the Dual LED Flasher works; devilishly simplepic.twitter.com/av462BoDfU

    7:02 PM - 7 May 2016
    • 6 Retweets
    • 26 Likes
    • Diane Bruce mark pearrow Ian Wojtowicz Kent K Barnes Aurelio kiran HyDz Ram krishna mahat Jean Pierre Cuba
    12 replies 6 retweets 26 likes
      1. New conversation
      2. Star Simpson‏ @starsandrobots 7 May 2016
        Replying to @starsandrobots

        @starsandrobots (this is in the service of writing the best possible explanation for documentation. This one is hard!)

        1 reply 1 retweet 0 likes
      3. Star Simpson‏ @starsandrobots 7 May 2016
        Replying to @starsandrobots

        @starsandrobots it's been amusing as well to see which circuit simulators can and cannot model it functioning. Depends on analog effects so

        1 reply 0 retweets 1 like
      4. Star Simpson‏ @starsandrobots 7 May 2016
        Replying to @starsandrobots

        @starsandrobots simulators that treat every transistor as being perfectly identical fail to be able to model the behavior of this one

        2 replies 0 retweets 5 likes
      5. Peter Barfuss 𒀱‏ @bofh453 7 May 2016
        Replying to @starsandrobots

        @starsandrobots so a ton of simulators model relaxation oscillators as having no output & you have to kickstart 'em with a brief transient

        1 reply 0 retweets 1 like
      6. Peter Barfuss 𒀱‏ @bofh453 7 May 2016
        Replying to @bofh453

        @starsandrobots I guess the people writing them forgot to add in the photoelectric effect. :P

        2 replies 0 retweets 1 like
      7. Star Simpson‏ @starsandrobots 7 May 2016
        Replying to @bofh453

        @bofh453 well in this case the two transistors race to turn on and if they're perfectly identical, neither wins and you never get started

        2 replies 0 retweets 2 likes
      8. Star Simpson‏ @starsandrobots 7 May 2016
        Replying to @starsandrobots

        @bofh453 which is never the case IRL

        0 replies 0 retweets 3 likes
      9. End of conversation
      1. New conversation
      2. Russ Nelson‏ @russnelson 7 May 2016
        Replying to @starsandrobots

        @starsandrobots If I have to explain how transistors work, I'm totally invoking the elephant theory of electronics!

        1 reply 0 retweets 0 likes
      3. Star Simpson‏ @starsandrobots 7 May 2016
        Replying to @russnelson

        @russnelson what's the elephant theory of electronics?

        1 reply 0 retweets 0 likes
      4. Russ Nelson‏ @russnelson 8 May 2016
        Replying to @starsandrobots

        @starsandrobots Heathkit manuals used elephants to explain why resistors slowed the down (hills), why capacitors made them pile up (gap).

        1 reply 0 retweets 0 likes
      5. Star Simpson‏ @starsandrobots 22 May 2016
        Replying to @russnelson

        I've been looking for examples but I'm coming up short. Any chance you have a pointer to a picture of this?

        0 replies 0 retweets 0 likes
      6. End of conversation
      1. New conversation
      2. Darius Kazemi‏ @tinysubversions 7 May 2016
        Replying to @starsandrobots

        @starsandrobots whoa, this is neat, would could you get a different duty cycle by varying R3 and R4? Or would it just not flash...

        1 reply 0 retweets 0 likes
      3. Star Simpson‏ @starsandrobots 7 May 2016
        Replying to @tinysubversions

        @tinysubversions that *should* work though the resistor values are quite high as is — I would swap in different C1/C2 values

        0 replies 0 retweets 1 like
      4. End of conversation
      1. New conversation
      2. Marsh Ray‏ @marshray 7 May 2016
        Replying to @starsandrobots

        @starsandrobots when q1 goes on, its collector voltage goes up, turning off q2

        2 replies 0 retweets 1 like
      3. Russ Nelson‏ @russnelson 7 May 2016
        Replying to @marshray

        @marshray @starsandrobots This is correct and good, but I did it in one tweet.

        1 reply 0 retweets 1 like
      4. Star Simpson‏ @starsandrobots 7 May 2016
        Replying to @russnelson

        @russnelson @marshray I'm going for "explain like I'm five years old" levels; but yes, nice work cramming it in 140

        1 reply 0 retweets 1 like
      5. Russ Nelson‏ @russnelson 7 May 2016
        Replying to @starsandrobots

        @starsandrobots @marshray Hrm. Have to explain how a transistor, resistor and capacitor work first, then. Also voltage. And current. Can't!

        0 replies 0 retweets 0 likes
      6. End of conversation
      1. New conversation
      2. Stephen S. Pumpkins‏ @steveintransit 7 May 2016
        Replying to @starsandrobots

        @starsandrobots seesaw analogy here? Do people know what those are?

        1 reply 0 retweets 0 likes
      3. Star Simpson‏ @starsandrobots 7 May 2016
        Replying to @steveintransit

        @steveintransit I mean sure, okay.. how would you state this?

        1 reply 0 retweets 0 likes
      4. Stephen S. Pumpkins‏ @steveintransit 7 May 2016
        Replying to @starsandrobots

        @starsandrobots both weighs same but once they start, each side pushes when down, reversing direction. that's as far as I got with my kids.

        0 replies 0 retweets 0 likes
      5. End of conversation

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