Any good explanation of Passive EQ Filters??

777funk · 13th March 2008, 09:07 PM

I have been building electronics since I was a kid. I've learned a good deal of tube audio. But I know very little about Filters (EQing). I studied EE in College and have a Bachelors therein but I know only the basics in Filters.

Are there any good references on tone-stacks? I understand Fender guitar amp EQ to a certain extent but definitely could know more. Is there anything out there that really explains things. Or could help aid in EQ structure design?

rman · 13th March 2008, 11:38 PM

Hi.

Try theese links.
[URL=http://www.angelfire.com/electronic/funwithtubes/Amp-Tone-A.html]

[URL=http://www.angelfire.com/electronic/funwithtubes/Amp-Tone.html]

http://home.comcast.net/~stphkeri/tone_control.html

cerrem · 14th March 2008, 01:10 AM

If you are an EE then you just need to go back to the books to refresh....it's all there..
You basically should be able to go back and forth between BODE plots and deriving the transfer function and then extracting your POLES and ZEROES ..... These POLES and ZEROES are applied to a filter circuit...
If you need adjustable filtering, then you calculate for variable R , using potentiometers..

You can think of passive filtering as frequency dependent voltage dividers, if thats any help.....

Another key thing to keep in mind when designing filters, is knowing your source impedance as well as you loading impedance..this should be included in your transfer function analysis.....

Chris

Sherman · 14th March 2008, 01:14 AM

Check out Duncan Amps Tone Stack Modeler. A free download it shows the effects of changing tone stack parameters with some common topologies.

While you are there pick up PSUD II as well. A power supply modeler.

http://www.duncanamps.com/software.html

rman · 16th March 2008, 12:37 AM

another informative source.

http://members.aol.com/sbench/freqresp.html

13th March 2008, 09:07 PM	#1
777funk diyAudio Member Join Date: Feb 2007 Location: MO	Any good explanation of Passive EQ Filters?? I have been building electronics since I was a kid. I've learned a good deal of tube audio. But I know very little about Filters (EQing). I studied EE in College and have a Bachelors therein but I know only the basics in Filters. Are there any good references on tone-stacks? I understand Fender guitar amp EQ to a certain extent but definitely could know more. Is there anything out there that really explains things. Or could help aid in EQ structure design? __________________ Nick

14th March 2008, 01:14 AM	#4
Sherman diyAudio Member Join Date: Feb 2004 Location: Chicago area	Check out Duncan Amps Tone Stack Modeler. A free download it shows the effects of changing tone stack parameters with some common topologies. While you are there pick up PSUD II as well. A power supply modeler. http://www.duncanamps.com/software.html __________________ --Sherman

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
Need formulas for multi-poles RC low pass passive filters	gaetan8888	Digital Source	9	13th March 2008 03:59 AM
Are high Q (1 < 1.5) passive filters bad?	owdi	Multi-Way	2	31st March 2007 07:03 PM
passive filters for DACs	plp	Digital Source	10	17th August 2006 12:31 AM
software for designing passive notch filters	Puggie	Multi-Way	2	28th June 2005 03:32 PM
Are CLC and CRC filters any good for anything else than class A?	Bricolo	Parts	8	13th February 2004 02:17 PM

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

13th March 2008, 11:38 PM	#2
rman diyAudio Member Join Date: Oct 2007	Hi. Try theese links. [URL=http://www.angelfire.com/electronic/funwithtubes/Amp-Tone-A.html] [URL=http://www.angelfire.com/electronic/funwithtubes/Amp-Tone.html] http://home.comcast.net/~stphkeri/tone_control.html

14th March 2008, 01:10 AM	#3
cerrem diyAudio Member Join Date: Jun 2005 Location: San Diego, CA	If you are an EE then you just need to go back to the books to refresh....it's all there.. You basically should be able to go back and forth between BODE plots and deriving the transfer function and then extracting your POLES and ZEROES ..... These POLES and ZEROES are applied to a filter circuit... If you need adjustable filtering, then you calculate for variable R , using potentiometers.. You can think of passive filtering as frequency dependent voltage dividers, if thats any help..... Another key thing to keep in mind when designing filters, is knowing your source impedance as well as you loading impedance..this should be included in your transfer function analysis..... Chris

16th March 2008, 12:37 AM	#5
rman diyAudio Member Join Date: Oct 2007	another informative source. http://members.aol.com/sbench/freqresp.html