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pyf 
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Mar 18, 2015 02:09
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| # ? May 15, 2024 06:49 |
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I don't worry 'bout them anymore.
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Mar 18, 2015 02:10
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the resistor is only there so you can bring the input up to high some other time without problems otherwise just ground it
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Mar 18, 2015 02:11
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it's to keep it from floating, so it's always pulled low or high.
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Mar 18, 2015 02:37
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Doc Block posted:well yeah, a pull down resistor pulls it down to logic level zero, but if the resistor is restricting the flow of electricity to keep it at zero, the conventional flow would put it between positive and the pin. um pull up and down is all to do with voltage and I don't see how the direction of current flow is relevant at all
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Mar 18, 2015 03:22
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i don't down you understand how it works but you've done a weird job of explaining it
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Mar 18, 2015 03:23
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I don't even understand what you are confused about, thats how confused you are its like derp inception in here WOM
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Mar 18, 2015 03:24
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 OG diodes 
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Mar 18, 2015 03:38
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Jonny 290 posted:I don't even understand what you are confused about, thats how confused you are electrons go backwards
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Mar 18, 2015 03:44
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echinopsis posted:electrons go backwards much like your posting
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Mar 18, 2015 03:47
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echinopsis posted:electrons go backwards who cares. just pay attention to the + and - until you start loving with tubes
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Mar 18, 2015 04:00
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electrons go backwards in time
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Mar 18, 2015 04:33
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that is to say, time always goes backwards but electrons actually forwards in time
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Mar 18, 2015 04:34
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charge holes propagate in the direction of conventional flow. electrons rush in to fill the holes, moving opposite the flow.
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Mar 18, 2015 04:52
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connecting a battery/voltage source blows open holes in the circuit and electrons fill them up
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Mar 18, 2015 04:54
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Mar 18, 2015 04:57
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what if holes were real and electrons were merely the lack of a hole
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Mar 18, 2015 05:02
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im the redundant animation of the word in
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Mar 18, 2015 05:02
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hobbesmaster posted:what if holes were real and electrons were merely the lack of a hole the holes are real. literally an empty space
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Mar 18, 2015 05:10
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zeners are cool if you use them right. i like to fixed bias them and then hang a bjt follower off it to keep the loading minimal. idk if thats the right thing to do or what but it works for me
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Mar 18, 2015 05:11
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Doc Block posted:only time I've had to worry about electron flow vs conventional is when I was learning about pull up and pull down resistors. im pretty sure you learned something incorrectly or learned a wrong thing
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Mar 18, 2015 05:39
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because the electrons, and thus the electricity, is coming from ground 
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it's called a "pull down" because when the driver is disconnected it provides a path to discharge the line to ground or a pull up because it does the same thing but to vcc like it's just chillin there, providing a constant tug on the line in one direction or the other. it's probably not very strong, so whatever's normally driving the line can do its thing, but when nobody's driving the line, it goes on and drags that line to one or the other so it ain't just floating in the breeze
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Mar 18, 2015 05:41
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yeah, I know what they're for and when to use them. my explanation was really bad and I apologize to YOSPOS. now that I think about it, of course that's not what's happening. the pull down resistor provides a path to ground for stray voltages, but provides resistance on that path for when the pin is connected to positive, so the electricity flows through the pin instead. IDK what I was thinking with the electron poo poo. more dumbass poo poo from doc block ITT. I hope this doggy pic can win back your hearts, yospos 
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Mar 18, 2015 06:10
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electronics is hard
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Mar 18, 2015 06:14
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quote:but provides resistance on that path for when the pin is connected to positive, so the electricity flows through the pin instead. neg. 99.99999% of the current will flow through the resistor, most inputs are very high impedance, meaning that they don't consume much current. think of them as just basically reading a voltage the first part you got right
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Mar 18, 2015 06:23
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Doc Block posted:yeah, I know what they're for and when to use them. aint gon be no forgiveness unles that rover has a mother fuckin rocket on its back
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Mar 18, 2015 06:58
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learning electronics step 1: do not read forest mimsDoc Block posted:my explanation was really bad and I apologize to YOSPOS. now that I think about it, of course that's not what's happening. the pull down resistor provides a path to ground for stray voltages, but provides resistance on that path for when the pin is connected to positive, so the electricity flows through the pin instead. Gazpacho fucked around with this message at 07:21 on Mar 18, 2015 |
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Mar 18, 2015 07:04
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Jonny 290 posted:neg. 99.99999% of the current will flow through the resistor, most inputs are very high impedance, meaning that they don't consume much current. think of them as just basically reading a voltage what? then what is even the point of the resistor then? solely so you don't have a short to ground? my EE-fu is weak, it seems 
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Mar 18, 2015 07:53
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if there is no resistor then nothing else can pull the input high, it's just permanent 0
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Mar 18, 2015 07:54
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pretend you have a lovely latch on a backyard gate. so you put a little spring on the handle. that keeps it where you want it. but you can still overpower the spring when you want to open the latch.
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Mar 18, 2015 07:56
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i dont get what j290 is saying either... because surely whatever you can say about a pulldown you cn say about a pullup?
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Mar 18, 2015 07:58
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yes. forget the mechanics of electrons for now. just think about the gate thing
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Mar 18, 2015 07:58
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gate thng
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Mar 18, 2015 08:36
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Esaki diodes are my favorite, then probably the light emmiting diode
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Mar 18, 2015 09:33
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Jonny 290 posted:tunnel diode best diode yes!!
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Mar 18, 2015 09:35
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how about transistors? i like the darlington transistor bc it's high-gain
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Mar 18, 2015 09:47
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Silver Alicorn posted:
These things stink.
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Mar 18, 2015 09:47
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Gazpacho posted:learning electronics step 1: do not read forest mims that handwritten looking electronics book forms most of the breadth and width of my electronics knowledge since i read it as a kid what's wrong with it 
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Mar 18, 2015 09:49
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pro tip: make sure you put your pull resistors near the driver also make sure the device doesn't have them internally
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Mar 18, 2015 09:50
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| # ? May 15, 2024 06:49 |
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quadpus fucked around with this message at 10:25 on Mar 18, 2015 |
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Mar 18, 2015 10:22
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