Does This Dress Make Me Look Chat?

Discussion in 'Stoners Lounge' started by Aerianne, Jul 23, 2015.

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  1. AceK

    AceK Scientia Potentia Est

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    it seems that I need PNP transistors and all I have is NPN ones, I think there has to be a way to connect the NPN transistor to make it work but my electrical engineering knowledge is pretty limited. it works when i susbstitute the seven segment display with a regukar LED, connecting the cathode to GND and anode to the emitter so it must have something to do with the fact that the cathodes from the display are connected to open drain outputs on the shift register and I cant seem to wrap my head around how that ground is different from a nirmal ground when the storage register output is high. the software works though, only tricky oart with that was coming up with a table of 8-bit values to send the shift register to display certain character which meant tediously counting segments and reasoning about which segments should be lit to display each character, and then scribbling down hexadecimal values on a peice of paper for each character. it seems everyone uses PNP transistors to switch the anode current ... but some people online are assholes and think they are so much better than you just because you had to ask a question about a transistor or an open drain. in the software world a 1 is a 1, a 0 is a 0 but in hardware world things get confusing when you have to deal with current source vs current sink, and whether you need a pullup/pulldown resistor to get the pin to take the logic states you need.

    obviously they are superior to me in every way ...
     
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  2. Tyrsonswood

    Tyrsonswood Senior Moment Lifetime Supporter

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    From my experience back in the Fuzzbox days, no, it doesn't work that way... Unless you are only using two legs (I.E. as a diode)

    ______________________________________________

    ML... Hope baby is okay.
     
  3. AceK

    AceK Scientia Potentia Est

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    I pretty much confirmed that no .. it doesnt :p if theres a way to to do it i dont know what it is. i have to multiplex the display so need a way to switch the anodes in sequence else it would require too many I/O lines. right now, the same thing gets displayed on all four digits, so tomorrow i should probably go to radioshack and get some PNP transistors. radioshack doesnt have the stuff they used to it seems

    [​IMG]
     
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  4. Tyrsonswood

    Tyrsonswood Senior Moment Lifetime Supporter

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    You mean they still carry stuff other than cell phones?
     
  5. AceK

    AceK Scientia Potentia Est

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    yeah, that lol. it just seemed like they used to have a lot more interesting geeky stuff and now only have a small subset of what they used to. it was a long time ago, and I was young though so maybe it's just my imagination ...
     
  6. deleted

    deleted Visitor

    very little stuff, why I took a shit find when I lost my precision wire snips..
     
  7. AceK

    AceK Scientia Potentia Est

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    This 7-segment displays data sheet has table, at the top of the table it says "LED Chip Electircal & Optical Chara Queristics:" .. i didnt' make a typo, that's what it says .. fuckin chinese shit at the top. I wonder if they used google translate?
     
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  8. Lynnbrown

    Lynnbrown Firecracker

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    Prayers to you and Baby Oz, ML!

    How in the world did lil precious get ecoli?
     
  9. Heat

    Heat Smile, it's contagious! :) Lifetime Supporter

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    ML, much love and energy to you and Oz. Remember he has a whole team there to look after him, you now also need to look after you! That way when he is back to screaming and kicking and nursing you will be ok. You are all in my thoughts and take care of you too.
     
  10. SpacemanSpiff

    SpacemanSpiff Visitor

    early fights will make him stronger [​IMG]



    seen i tool i want to buy a few weeks ago ($500)...but need to budget bigtime so i told myself i will only buy it if i sell another certain tool that i have plenty of (worth $600)

    got a possible buyer coming tomorrow ....or a bullshitter..cant really tell yet
     
  11. thedope

    thedope glad attention Lifetime Supporter

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    Probably a product of their cheap knock off pirate economy. They are functional but damned garments are prone to have wonky stitching.
     
  12. broony

    broony Banned

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    if I could do to you, the things that I, wanted to do to you, would you still want me to?
     
  13. thedope

    thedope glad attention Lifetime Supporter

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    I have no particular desire for anything and haven't expressed any condition that involves me desiring you behave in any fashion but I respond to specific invitations.
     
  14. broony

    broony Banned

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    but how good are you at poker... hmm?
     
  15. pensfan13

    pensfan13 Senior Member

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    I didnt know there was still any radio shacks.
     
  16. SpacemanSpiff

    SpacemanSpiff Visitor

    all gone here

    bell bought them i think (what was left of them ) and changed name to The Source

    crap store
     
  17. Spectacles

    Spectacles My life is a tapestry Lifetime Supporter

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    Sending prayers and positive energy to you and Oz. Be well and remember to take care of yourself.
     
  18. rollingalong

    rollingalong Banned

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    https://www.youtube.com/watch?v=dE0K7z1gbYQ
     
  19. Tyrsonswood

    Tyrsonswood Senior Moment Lifetime Supporter

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    https://www.youtube.com/watch?v=OEJh2FFUUoU
     
  20. thedope

    thedope glad attention Lifetime Supporter

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    Your suddenly watery eyes could give an inkling
     
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