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Old 31st August 2006, 01:30 AM   #1
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Default Variable Low pass for sub

hey I need to know how to make a variable lowpass filter for a cheap portable sub I'm making. Its only 22watts, so nothing hi-fi or fancy. I just need an opamp circuit that is simple, runs off of single supply ( 12v preferably)

I need a cut off frequency of 200hz, variable down to 50hz.

know of any good circuits? I'm new to designing low pass filters..
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Old 31st August 2006, 08:28 AM   #2
Nuuk is offline Nuuk  United Kingdom
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There are any number of cheap adjustable active crossovers sold for use in cars , ie 12 volt operation. Have a Google.
The truth need not be veiled, for it veils itself from the eyes of the ignorant.
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Old 31st August 2006, 09:14 AM   #3
GPE is offline GPE  China
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Default Low pass filter sch

I wish this attached sch will be useful for you.
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File Type: pdf low pass filter.pdf (19.9 KB, 163 views)
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Old 1st September 2006, 11:55 PM   #4
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well I tried googling it, couldnt come up with much

I need it to run on 12v... not +/- 12v. I have a whole bunch of TLO72's so thats what i'll use.

All I need it to do is mix the left/right channels and have a boost/cut for only the bass frequencies, and I need 150hz up cut off.
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