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Old 6th December 2004, 01:54 PM   #1
keyser is offline keyser  Netherlands
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Default 3rd order hi-pass

hi guys,
does any one of you know how to make a 3rd order high-pass filter at 40 hertz, and one at 50 hertz?
my plate-amp doesn't feature a high-pass, so i guess i should build one myself. thanks!
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Old 6th December 2004, 04:33 PM   #2
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Do you want passive or active? I'd suggest active, as I've heard they dont have some of the phase problemes that passive filters have, and when you add inductors and capacitors to the speaker circuit, you lose a bit of power. WinISD has circuitry design calculators, but only has designs for 1st and 2nd order filters. I'm no expert, but I'd say you could wire a 1st and 2nd order active filter in series and get a 3rd order filter. The first filter would cut down to 6db/octave, then the second filter would cut down another 12db/octave giving you a total of 18db/octave. There might be some problem with that I dont know about. There's probably a design using a single transistor.
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Old 6th December 2004, 11:20 PM   #3
keyser is offline keyser  Netherlands
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thanks.
i want to use an active filter (low-level) between plate-amp and poweramp. Wouldn't it be better to make a good 3rd order filter from the start?
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Old 7th December 2004, 12:30 AM   #4
simon5 is offline simon5  Canada
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I found a webpage that calculate everything, you might want to try it out.

http://ccs.exl.info/calc_cr.html
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Old 7th December 2004, 01:13 AM   #5
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try filter pro from texas instruments
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