> How 1.6KHz was obtained from 10K and 0.01uF ? ( what the formula )

The rolloff frequency (-3dB point) of a single pole R/C filter is

  F = 1 / (2Pi * R * C)

where F is the frequency in hertz, R the resistance in ohms, and C the
capacitance in farads.  This also means that

  F * R * C = 1 / 2Pi

This is such a handy formula that I keep 1,000,000 / 2Pi = 159,155
permanently in register 7 of my calculator.  I can start with the register
7 value and divide it by any two of the frequency in herz, the resistance
in ohms, or the capacitance in microfarads to get the third value.  Very
handy.


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