Variable Low pass for sub

ThSpeakerDude88 · 31st August 2006, 01:30 AM

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..

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

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.

31st August 2006, 01:30 AM	#1
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	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..

31st August 2006, 08:28 AM	#2
Nuuk diyAudio Member Join Date: Feb 2003 Location: Somerset, SW England	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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
DIY Low Pass and Mid/High Pass (Bass Blocking) Filters	runslikealpaca	Everything Else	1	19th June 2009 10:59 PM
Variable High pass filter?	ayearofholidays	Instruments and Amps	1	30th April 2009 01:53 AM
Variable frequency low pass filter	pk386	Chip Amps	11	25th September 2004 01:43 PM
variable Low-Cut, High-Pass & High-Cuts	TobWen	Solid State	3	14th September 2004 09:40 PM
My opinion on Pass Labs and Mr. Pass (Nelson) himself	b_online	Pass Labs	11	21st May 2003 12:39 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

1st September 2006, 11:55 PM	#4
ThSpeakerDude88 diyAudio Member Join Date: Jun 2005 Location: USA	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.