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ThSpeakerDude88 31st August 2006 01:30 AM

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? :confused: I'm new to designing low pass filters..

Nuuk 31st August 2006 08:28 AM

There are any number of cheap adjustable active crossovers sold for use in cars , ie 12 volt operation. Have a Google. ;)

GPE 31st August 2006 09:14 AM

Low pass filter sch
2 Attachment(s)
I wish this attached sch will be useful for you.

ThSpeakerDude88 1st September 2006 11:55 PM

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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