Notch Filter for Guitarists of All Ages

[WGTP]

Yeah, that is what I meant.  THANKS stm

I'm finding that the .022uf/.0047uf combo with a 10k resistor is my preference.  That produces the smallest notch of the options listed (I'm SWAGing that it is -9db at 1.6k) with the .047uf/.0022uf combo producing the largest notch (SWAG -18db at 1.6k).  

Now I don't like the distortions without the notch :shock:

Happy filtering.  

[petemoore]

5 parts and a few connections..I gotta try this out.
 I've been looking for a super simple notch to try...

[petemoore]

That was easy. Sure does the nice job cleaning up the mids...takes 'em right out if you like. Interesting effect.
 Makes getting the sheen on the highs real easy..I only tried it with a DS-1 I built so far, amazing nice job smoothing the crunch down.
 I just stuck it in it's own box, last thing in the chain. Clean it sounds alot different too, but for Dist, it's a great thing to have one.
 I used the DS-1, it has a tone knob, the Notch knob and the tone knobs interact very nicely.
 Thanks for posting that little circuit, I didnt even have to copy it on paper, just did it by memory in about 15 minutes, socketting the 22k and .022uf, using a 47k trimpot [I think 20k would do it].
 Using it to great effect, I'd been looking for a notch, this one does a neat trick, a great accessory to any Fuzzbox [I sezz], and no power supply...

[travissk]

Sure does the nice job cleaning up the mids...takes 'em right out if you like.

:shock:
Noooooo!
Just kidding :wink: - if you're going for the scooped mids thing, this is a great and easy way to get it for any effect. Not my cup of tea, but it does give you some added "crunch" and makes many distortions sound better - just lessens their ability to cut through in a band setting.

[petemoore]

yupp, Thins it ... should be amp sensative and guitar too, what distortion your'e using and where the tone knob is set matter...
 It seems to get pretty normal sounding [no bypass yet] if i turn the pot a little ways, then I can tune in what is a very noticable alteration at high setting.
 Messing with Dist EQ is always interesting, can take your out of hand Fuzz sound and tailor fit it,  often taking your favorite Fuzz and making just plain better if not just more variable.
 I really am happy this mod popped up, I'd been stuff with opamps, this one seems guaranteed low noise, and offers many advantages [if less variable than] over the OA stuff I was working on.
 It gives a shaping effect I didn't have, Offers a new voice to my Distortion [only tried the DS-1 so far], one of the simplest most useful builds I've done in a while...it fills the nitch :lol:  
 What a nice thing to have with your distortion,  Clean too, I like recording various voices, having not tried it with bypass,  or at high volumes, I can only guess or theorize...should tune to smooth sound that will cut through a stage mix, [I'll try that tomorrow probably].
 Perhaps I add gain transistor on it after I try it with bypass, I'm thinking notch tone but louder would be nice switch to have for leads.

[WGTP]

Very well said.  I agree 100%.  

I finally had time to read the GEOFEX article and I think this is called a Bridged T Filter.  Using 2 - 22k resistors and a .01uf and .0047uf cap produce a notch at 1.6kHz.  The equation for the center frequency is the same as a regular hi or low pass filter at 6db/oct.  According to R.G., it is a fairly broad notch.  Obviously when we start changing the ratios between the caps and resistors, the equation must be changed to be accurate.  That is why I was SWAGing.

I found another nice combo last night a .01/.0047cap 22k resistors combo that I think notches around 2.4kHz  It reduces and highs and smooths things out leaving a nice mid-range with some sparkle on top.  Using it with a Joe Davidson "Frankenstein" of a mosfet Blackfire stage and 2 "Vulcanized" Obsidian stages.  Very nice

Need to try this if your into distortions.  Lots of variations.  You can use a dual pot and vary the resistance values or switches to vary the cap values.  

[petemoore]

What is "SWAGing'?
 yupp a little tuning and I like it just fine with the one knob.
 The sockets for the 22k and the .0022uf [?] seem to make it pretty tunable...more knobs/switches could of course be added, I find just a simple preset nothch to be quite usable...
 It's like an 'instant 'ol friend' to me already.

[WGTP]

SWAG = Scientific Wild A** Guess!

It is sort of strange the way it adds smoothness and compression even with the distortion maxed.  Much more processed sound sounding.  

[WGTP]

SWAG = Scientific Wild A** Guess!

It is sort of strange the way it adds smoothness and compression even with the distortion maxed.  Much more processed sound sounding.  

[WGTP]

http://www.jeverman.com/lff.html

Check this out.  Someone is already doing this commercially.