Active notch filters

neutron7 · 19th November 2006, 02:38 AM

I was thinking of building some small full rangers which need a notch filter. i was going to build amplifiers in "powered monitor" style

Is there any reason not to use an active line level circuit to notch filter the audio before the power amp? It would be cheaper and can be adjusted.

Vikash · 19th November 2006, 11:31 AM

none that I can see. I f you can do it active, do it active.

consort_ee_um · 19th November 2006, 12:51 PM

One way to do it is to use a graphic equaliser type circuit which uses a gyrator as an inductor in a series RLC circuit see this thread:
Just got a pair of FR125s

19th November 2006, 02:38 AM	#1
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	Active notch filters I was thinking of building some small full rangers which need a notch filter. i was going to build amplifiers in "powered monitor" style Is there any reason not to use an active line level circuit to notch filter the audio before the power amp? It would be cheaper and can be adjusted.

19th November 2006, 11:31 AM	#2
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	none that I can see. I f you can do it active, do it active. __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

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19th November 2006, 12:51 PM	#3
consort_ee_um diyAudio Member Join Date: May 2004 Location: Hertfordshire	One way to do it is to use a graphic equaliser type circuit which uses a gyrator as an inductor in a series RLC circuit see this thread: Just got a pair of FR125s

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