[sdiy] freq conversion [harry, don't read! easy stuff mode]

[Dave Krooshof]

For RC filters, (a cap and a resistor, cap in series, resistor in paralel
or v.v., depending on lowpass or hipass, resp.) it's:

Ÿ = 1 / (2¼ R C)

This is also usefull for the Wienbrug (bridge?) osc.
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LC kring, a trafo.coil and a cap in paralel with each other in a signal wire:

Ÿ = 1 / (2¼ ˆLC)

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reactance (reactantie) of a cap:

X = 1 / (2¼ŸC)

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If my mac letters do not meet your standards:
Ÿ = freq
¼ = pi
ˆ = root

So, a cap does have a relation to time and freq. And there is a relation
between it's resistance for an AC and it's freq. But that relationship also
relies on the surroundings: Mostly in a relation to a resistor. So both the
cap (C) and the resistor (R, resitance as X) appear in the Ÿ formula.
Soooo.....
There are no tables, think of it as curves for each C:   Ÿ on one axis, R
on another.

Actually, the last one on the list asking for a V to Ÿ convertor was me.
Harry did reply informative though, as he'll do now, probably with some
usefull practical remark that will bleach above formula.

Dave

BTW Harry, I lerv the <bmo> tag.

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Dave Krooshof http://www.xs4all.nl/~krooshof
geluidstechnicus @ http://www.ahk.nl/the/theatertechniek_ov.html
webmaster: http://www.popronde.nl
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