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Old 9th January 2012, 05:20 PM   #1
Reno1 is offline Reno1  United Kingdom
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Default Sweep Eq

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.
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Old 9th January 2012, 06:04 PM   #2
macboy is offline macboy  Canada
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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.
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Old 9th January 2012, 07:35 PM   #3
Reno1 is offline Reno1  United Kingdom
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Do you know of any simulator I can use on mac to play with this circuit
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Old 10th January 2012, 12:32 PM   #4
macboy is offline macboy  Canada
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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.
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Old 10th January 2012, 02:58 PM   #5
Reno1 is offline Reno1  United Kingdom
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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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