Re: Low pass filters
From: John Larkin (jjlarkin_at_highlandSNIPtechTHISnologyPLEASE.com)
Date: 07/30/04
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Date: Fri, 30 Jul 2004 08:24:25 -0700
On Fri, 30 Jul 2004 07:11:34 GMT, zalzon <zalzonishappy@zalll.com>
wrote:
>No matter how much effort I put into understanding these low and high
>pass circuits I always come up clueless. I can't seem to visualise
>what the electrons are doing at the resistor and capacitor. Its been
>slowly driving me insane.
>
>Why is low frequency AC allowed to pass but not high? Can someone
>explain this to me in easy to understand terms referring to the
>electrons in particular as they move around the circuit.
>
>Please don't give me equations like Xc = 1/2pifC..etc cos that is just
>crap. I know that already and its not helping me visualise anything.
>
>I want to know what the electrons do when they reach the resistor in a
>low pass circuit with low frequency AC.
It's like cars running into bales of hay. They have to slow down and
fight their way through, because they encounter resistance and can't
see where they're going.
> What happens then when they
>encounter the capacitor.
This is more like a parking lot. They pile up, hang around a while,
and then can leave.
> Why is low freq allowed to pass but not high
>frequency?
Cars already going slow don't much mind the hay or having to stop for
a while; the throughput is the same. If you sent cars into this system
on alternate days, they'd all emerge on those same days. But if you
sent one convoy every 10 minutes, only a small, smooth trickle would
come out the other end of the process.
That's maybe about the best you can do with analogies.
John
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