Low frequency cutoff calculation for Noninverted. - diyAudio
 Low frequency cutoff calculation for Noninverted.
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 8th August 2006, 08:52 AM #1 diyAudio Member   Join Date: Jul 2005 Location: BKK Low frequency cutoff calculation for Noninverted. Can anybody explain how to calculate the lowfrequency cutoff of input capasitor for inverted GC? I commonly found the 4.7mf input cap for noninverted schematic but I already a pair of 1mf of very good cap, is the value is too low?
 8th August 2006, 08:58 AM #2 diyAudio Member   Join Date: Oct 2004 159155/(resistance * frequency)
 9th August 2006, 02:12 AM #3 diyAudio Member   Join Date: Jul 2005 Location: BKK hmmmm..... I do not quite get it. Do u mean? 159155/(resistance * frequency)= capasitor value
 9th August 2006, 03:33 AM #4 diyAudio Member   Join Date: Jun 2004 Location: Bangkok The low frequency cuttoff is 4Hz, so you can calculate the DC blocking capacitor by below formula Ci = 1/(2*PI*f*Ri) If your input impedance is 22K Ohm Ci should be 2.2uF by the formula.
 9th August 2006, 03:36 AM #5 diyAudio Member   Join Date: Jun 2004 Location: Bangkok 159155 = 1000000/(2*pi) The formula unit is microfarad.
 9th August 2006, 03:57 AM #6 diyAudio Member   Join Date: Jul 2005 Location: BKK Thank a lot. But what is PI???
 9th August 2006, 07:32 AM #7 diyAudio Member     Join Date: Jan 2002 Location: Sydney/Australia 22/7 __________________ Greg Erskine
 9th August 2006, 10:05 AM #8 diyAudio Member   Join Date: Oct 2004 I tried both formulas or formuli. I got 1.80uf.
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Join Date: Jul 2006
Units of measurement

Quote:
 Originally posted by 5150ed Thank a lot. But what is PI???
Attached Files
 units of measurements.pdf (19.0 KB, 28 views)

diyAudio Member

Join Date: Feb 2004
Location: Chicago area
Quote:
 Originally posted by 5150ed Thank a lot. But what is PI???

Technically it is the ratio of the circumference of a circle to its diameter. It is an 'irrational number', when the division is carried out it never ends and never repeats.

For all practical purposes in these formulas just use 3.1416.
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