Sweep Eq

Reno1 · 9th January 2012, 05:20 PM

Hi I am quite new to electronics and I am wondering could anyone out there help me modify this semi parametric eq I am playing with. At the moment the eq is set to sweep from 100hz to 8khz however I want make the frequency sweep from around 500hz to 15khz if thats possible, any helps appreciated thanks.

macboy · 9th January 2012, 06:04 PM

Change C1 to alter the overall range (both upper and lower limits will change); change R6 and R4 to alter only the lower frequency limit (though it will interact somewhat with the upper one too). Play around in a simulator to find the values you want.

Reno1 · 9th January 2012, 07:35 PM

Do you know of any simulator I can use on mac to play with this circuit

macboy · 10th January 2012, 12:32 PM

I use LTSpice, on a windows PC. It is free and powerful. Others have used LTSpice under Wine on Linux, and I see no reason that it should not work under Wine for Mac OS X also. Look up Wine (free) or Winonx (not free). If Wine doesn't work, try using a virtual machine such as VirtualBox (free) and installing windows XP or whatever onto that. Then you can run anything, even things that won't run under Wine. I use VirtualBox on my Mac.

Reno1 · 10th January 2012, 02:58 PM

I was told that I could Scale the two caps smaller to push up the 100Hz 5x to 500Hz so 1/5th of C1 and C3 but will probably impact on the Q max and cut/boost

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9th January 2012, 06:04 PM	#2
macboy diyAudio Member Join Date: Oct 2003 Location: Ottawa, Canada	Change C1 to alter the overall range (both upper and lower limits will change); change R6 and R4 to alter only the lower frequency limit (though it will interact somewhat with the upper one too). Play around in a simulator to find the values you want.

9th January 2012, 07:35 PM	#3
Reno1 diyAudio Member Join Date: Jun 2011	Do you know of any simulator I can use on mac to play with this circuit

10th January 2012, 12:32 PM	#4
macboy diyAudio Member Join Date: Oct 2003 Location: Ottawa, Canada	I use LTSpice, on a windows PC. It is free and powerful. Others have used LTSpice under Wine on Linux, and I see no reason that it should not work under Wine for Mac OS X also. Look up Wine (free) or Winonx (not free). If Wine doesn't work, try using a virtual machine such as VirtualBox (free) and installing windows XP or whatever onto that. Then you can run anything, even things that won't run under Wine. I use VirtualBox on my Mac.

10th January 2012, 02:58 PM	#5
Reno1 diyAudio Member Join Date: Jun 2011	I was told that I could Scale the two caps smaller to push up the 100Hz 5x to 500Hz so 1/5th of C1 and C3 but will probably impact on the Q max and cut/boost