I adjust all paralel components with a resistor...seems Troels Gravesen is doing it too
He is also beginning to use the "notch" I have talked about before...series inductor paralelled with a resistor/cap
I have remembered wrong, I stand corrected....small cap first'
In a 12db filter the paralel inductor is "bigger" than the series cap, so ofcourse it starts with the "smallest" components...dont know what I have been thinking about
He is also beginning to use the "notch" I have talked about before...series inductor paralelled with a resistor/cap
I have remembered wrong, I stand corrected....small cap first'
In a 12db filter the paralel inductor is "bigger" than the series cap, so ofcourse it starts with the "smallest" components...dont know what I have been thinking about
Moondog55 said:
Hi,
Its 1/(2piFC), an inductor is 2piFL but note these are not resistances.
They are part of impedances known as reactances.
Resistance is real, reactance imaginary.
Impedance is complex, it can have real and imaginary parts.
Vector mathemetics are needed for analysis.
Take 3rd order Butterworth at 3KHz/8R.
4.4uF, 0.32mH, 13.3uF
= @3KHz, 12ohm series, 6ohm to ground, 4ohm series, 8R to ground.
Swapping the capacitors it is apparent that it loads the amplifier more.
It is not that simple as resistances because of resonances in the circuit.
These cause a 10dB peak and a dip to very low impedance.
Try the TinaTi circuit emulator, very friendly, has an impedance meter.
/sreten.
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