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 Post subject: Capasitors
PostPosted: 04.02.2003 01:51 
Thanks to Japala for the great lesson in basic electricity. Now that my curiosity has been stimulated can you explain how capasitors work in a DC circuit, using the animated led article you wrote? I thought they were just for AC current. Here's how I understand it(or not). Electrons flow in one side, say right, charges plates in capasitor. Electrons are pushed out other side, left, till capasitor is maxed out with stored energy. Current flow from other side, left, releases energy stored pushing it out the right .
The more I think about what I just wrote the more confused I become, until I realise I don't have a clue how these things work.
Please show me the way.
Thanks


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 Post subject:
PostPosted: 04.02.2003 11:08 
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With help of the capasitor you can fine tune for example the timings inside the DC circuit. Or like in this case because that capasitor isn't fully loaded in a nanosecond you can have slowly rising or slowly falling signals. This is why we can see those leds fade. Sure if you have constant 5 volts and no pulses going anywhere the capasitors isn't doing anything but if there are some problems with the feed, for example short cutouts the capasitor can release it's stored electricity to compensate this loss.


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PostPosted: 04.02.2003 15:17 
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You should have a look at this page:
http://electronics.howstuffworks.com/capacitor.htm

www.howstuffworks.com is a great site where they explain almost everything :P

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PostPosted: 04.02.2003 23:11 
Thanks for the replies. I think I need to study the schematics for the led circuit a bit more and then maybe I can get my head around the charging and discharging of the capacitor. Does the current to the capacitor fall of with the pulses from the 555 timer and when that happens the charge is released from the capacitor?


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