- Posted by Ron W. on January 10, 2001 at 21:04:10:
In Reply to: High-pass filter Laurel posted by John S on January 05, 2001 at 04:00:41:
The equation is:frequency = 1/(2piRC)
Solving for C:
C = 1/(2pifR)
C = capacitance
R = input resistor to next stage
pi = 3.141You can change the existing coupling cap or add a new one to the input. Obviously adding a new one will increase the degradation.
Ron
Follow Ups:
- Re: High-pass filter Laurel - Calculating R Chris O 11:01:22 01/19/01
(0)
- In Reply to: Re: High-pass filter Laurel posted by Ron W. on January 10, 2001 at 21:04:10:
Is the resistance R calculated by the total of the "grid stopper" resistor plus the Plate resistance of the next stage? Or is it the shunt resistor resistance?
To solve this equation for the "normal" 20hz start of rolloff for the typical 0.22uf cap, the R is around 36k ohms.
C = 0.00000022
F = 22
Therefore R = 36,000(I love calculations that include Pi)
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