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Old 17th March 2005, 08:18 AM   #1
k1jroth is offline k1jroth  Finland
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Default Check filter Schema Please

Hello

This is my first active filter design for subwoofer.
I`m a beginner so could you guys check is it ok.

Some explanations.

Chip OPA 2134

VOLUME is Rod Elliotts design
http://sound.westhost.com/project01.htm

IC1A normal butterworth high pass 7.4Hz (DC protection)

IC3B variable gain from Linkwitz

IC3A Linkwitz transform

IC1B normal variable butterworth lowpass (12db)

IC2A and IC2B is variable phase from Rod Elliott
http://sound.westhost.com/project103.htm

output R11 is to compensate cables capasitance.
C10 10pF (IC2B) is for preventing oscillation.

Please help beginner and check this schema.
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Old 18th March 2005, 11:05 AM   #2
k1jroth is offline k1jroth  Finland
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Sorry i forgot to paste picture and net is down so i post it in evening
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