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Geek Culture / Why does current oscillate through a capacitor?

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Dark Java Dude 64
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Posted: 18th May 2012 06:29
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In the simulator, when i connect a capacitor and power supply in series, i get the strange oscillation of the current. I thought that as a capacitor charged the current would slowly decrease at a slower and slower rate until there was nothing. Instead the cap never charges and this strange oscillation occurs. Anyone know why? Ill do some more experimentation and post the results.
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Benjamin
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Posted: 18th May 2012 07:01 Edited at: 18th May 2012 07:02
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Quote: "I thought that as a capacitor charged the current would slowly decrease at a slower and slower rate until there was nothing."


If the power supply is DC, yes.

I don't really know an awful lot about electronics, so I'll let someone else pick it up from here.



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Dark Java Dude 64
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Posted: 18th May 2012 07:12
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Quote: "If the power supply is DC, yes."
Precisely what i thought and the situation is was in, it had a DC power supply! I was particularly baffled watching the current oscillate through it.
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CoffeeGrunt
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Posted: 18th May 2012 08:59
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Yeah, the current should decrease while the voltage and resistance of the capacitor rise as it charges...A glitch in your simulator, perhaps?
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Dark Java Dude 64
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Posted: 18th May 2012 09:09
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Perhaps...
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TheComet
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Posted: 18th May 2012 14:05 Edited at: 18th May 2012 14:05
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Works for me...



Can you post a screenshot of your problem and the circuit?

TheComet


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DeadTomGC
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Posted: 20th May 2012 07:05
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@TheComet It's been long enough! What circuit simulator are you using?! What simulator uses symbols like the ones that yours does?

Why do you use the physics (like) symbol for the MOSFETs? (not talking the current circuit)

Also, if it's free, or if you know of a free one that'd be great!


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TheComet
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Posted: 20th May 2012 12:47 Edited at: 20th May 2012 12:49
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@ DeatTomGC

The simulator I use is called "Tina", or "Electina". It's costs quite a bit actually.

The symbols are the European standard of electronics. I prefer the American ones, but if you work at a company in Europe, you have to adapt. Same issue with the MOSFETs.

I've heard good things about this one here, never used it myself though : https://www.circuitlab.com/

And here's an open source one I found : http://opencircuitdesign.com/

@ DBD79

Perhaps you should try connecting your capacitor like this:



TheComet


TimePlan : https://docs.google.com/spreadsheet/ccc?key=0AmuAKJolqASndEVYOWMxb3l2OWV0UkV1anRSczZScHc
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WLGfx
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Posted: 20th May 2012 13:37
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@TheComet - He he he... Looks like a very kinky device you're devising...

Mental arithmetic? Me? (That's for computers) I can't subtract a fart from a plate of beans!
Warning! May contain Nuts!
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Dark Java Dude 64
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Posted: 20th May 2012 23:40
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Ooh I could connect the cap like that...


*goes and does that*
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DeadTomGC
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Posted: 21st May 2012 05:43
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@TheComet YOU!!!! YOU stole my Singularity generator schematics!!!


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Dark Java Dude 64
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Posted: 21st May 2012 06:05
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@AliveJimXY Comet is so awesome, he can do anything he likes, including stealing said schematics.
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DeadTomGC
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Posted: 21st May 2012 06:31
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Quote: "@AliveJimXY Comet is so awesome, he can do anything he likes, including stealing said schematics."
You talking to me?


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Dark Java Dude 64
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Posted: 21st May 2012 06:46
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Oh yeah.
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Benjamin
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Posted: 21st May 2012 07:39
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I've tried Yenka and Circuit Wizard, and unfortunately neither recreate the nuances of certain components, meaning some circuits just don't work as they should.

Quote: "@TheComet YOU!!!! YOU stole my Singularity generator schematics!!!"


For some reason I read that as "signature generator schematics".



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Dark Java Dude 64
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Posted: 21st May 2012 08:08
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There is a nice java sim called falstad circuit simulator that works quite nicely!! It is what I use. Well, the iPad version is what I use.
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CoffeeGrunt
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Posted: 21st May 2012 13:44
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Circuit Wizard failed my entire Electronics class. Loads of perfectly working circuits on screen, a tonne of failures in practical.
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TheComet
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Posted: 21st May 2012 14:27
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Quote: "Circuit Wizard failed my entire Electronics class. Loads of perfectly working circuits on screen, a tonne of failures in practical."


Yeah, you need to have a healthy mix of theory and practice. If you tip too far into theoretical stuff, you'll know how to calculate everything, but you'll never be able to actually make anything.

Quote: "@TheComet YOU!!!! YOU stole my Singularity generator schematics!!!"


Yes, and I also stole the 150'000'000 km long wire you had stuffed in your wardrobe in order to make the connection with the center of the sun. How do you get the other end of the wire there again? Your documentation said something about sacrificing dark basic dude79 in a second-hand shuttle for monkeys...

TheComet


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Dark Java Dude 64
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Posted: 21st May 2012 15:46
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Yay space ride!!!!
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CoffeeGrunt
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Posted: 21st May 2012 17:10
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Quote: "Yeah, you need to have a healthy mix of theory and practice. If you tip too far into theoretical stuff, you'll know how to calculate everything, but you'll never be able to actually make anything. "


No, it was glitches with Circuit Wizard. Circuits that worked and were designed on PC, didn't work once they were built. Kinda screwed the school's budget a little. xD
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Diggsey
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Posted: 21st May 2012 17:15
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Quote: "In the simulator, when i connect a capacitor and power supply in series, i get the strange oscillation of the current."


It's possible that the simulator simulates the slight inductance of the wires, in which case there will be a small amount of oscillation.

[b]
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Dark Java Dude 64
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Posted: 22nd May 2012 00:37
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That makes sense. One could assume a capacior is a spring and the electric chagre is an inertia less load on which the spring is acting. In that case would an inductor addd intertia, creating the oscillations?
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Diggsey
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Posted: 22nd May 2012 01:22
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Quote: "That makes sense. One could assume a capacior is a spring and the electric chagre is an inertia less load on which the spring is acting. In that case would an inductor addd intertia, creating the oscillations? "


I suppose it's kind-of like that, yes.

[b]
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DeadTomGC
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Posted: 22nd May 2012 03:28 Edited at: 22nd May 2012 03:28
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Quote: "Oh yeah."
Still not getting it.....

@TheComet Good, you stole my outdated documentation. I calculated that a portal to get me close to the sun would probably work out to be cheaper than a shuttle.

Working on that now.

Also, a fair warning about the old plan, Batman is real, and he might have some issues with it.


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