Active Tilt Equalizer

9/29/2014

Here is another filter commonly found in hifi amplifiers that I adapted it for use with 9v single supply and guitar signal. In the middle of the tone pot it is almost completely flat and to one side it boost below the center frequency and to the other side it cuts. It also works great as a treble booster or a bass booster (depending on how you set the level), both as a stand alone unit or after a low output fuzz. :)

I recommend putting the level/gain pot outside the box insted of a trimmer in this one.

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16 Comments

Billyreuben

10/12/2014 10:52:25 am

Which IC is used?

Fredrik Lyxzén link

10/12/2014 09:41:52 pm

Any dual op amp (TL072, 4558 ect)

Nicolas

4/25/2015 08:08:24 pm

Hello,

I'd like to know which C1 and C2 values should I put to have 60 Hz and, in another circuit, which C1 and C2 to have 35 Hz.
Is there a way to calculate that ?

Thanks,
Nicolas

Fredrik Lyxzén link

4/30/2015 06:07:26 pm

Hi Nicolas. Sorry for the late reply. I missed you comment.

I'm afraid I can't give you a good answer. Matematical formulas is my pet peeve, I forget them as fast as I learn them. You should ask in the diystompboxes forum, they will give you an answer. What are you using it for? 35 hz seems extremly low.. Even my studio monitors can't go that low.

Nicolas

5/1/2015 09:12:10 pm

Thanks,
It's for my bass guitar.
I wanted a big fat sound and I find it : I made two active Tilt Eq in series, one with your 64Hz settings and one with 220nf and 22nf and that's excellent.
I also put a blend in.
I'd like to thank you for all your other circuits too : I'm gonna make the Sonic Reducer, the Arcadiator and the DISCO soon ;-)

Fredrik Lyxzén link

5/3/2015 03:41:39 am

Cool! I'm glad you enjoy the content of my blog. :)
cheers / Fredrik

sebastian

3/24/2016 05:28:49 pm

hi, wonderful blog, i spent night dreaming on build all project!
i have a question about this filter..you suggest 125 as a center freq, is not too low? any method to have a switch between 2 different freq?
thanks!

Fredrik Lyxzén link

3/29/2016 07:06:32 am

Hi Sebastian,
Thank you. I'm glad you like my blog. :)

125hz is what sounded best to my ears, but I think you should socket the C1/C2 caps are experiment. You can use a DPDT on/on switch for flip between two different center frequencies. Like this - http://www.parasitstudio.se/uploads/2/4/4/9/2449159/1003990_orig.png
Cheers / Fredrik

Sebastian

3/29/2016 05:16:19 pm

woah!! today is my birthday, my girls give to me an ugly gift, the weather is raining..but you saves my birthday :9 thanks a lot, and sorry for noob questions

Fredrik Lyxzén link

3/30/2016 05:08:19 am

Lol. I'm glad I can help :)
Cheers / Fredrik

sebastian

4/16/2016 04:37:32 am

hi, im building it today!
on the level pot, i have to connect pin 2 and 3 together?

sebastian

4/16/2016 09:31:28 am

i just made it, its perfect as solo booster!
but i think is better on bass..anyway good layout!
have you got more pro audio layout like mic preamp, comp ecc?

Fredrik Lyxzén link

5/5/2016 01:16:04 pm

Hi Sebastian,
I'm glad you like it! It's a great booster indeed. :)

I don't have any more pro audio layout i'm afraid. Pro Audio stuff isn't really suited for vero IMHO.

Cheers
/ Fredrik

Robi

4/24/2020 12:29:08 pm

This looks nice, will definetely build it
Iwas wondering, is it possible to put various circuits with different caps and resistors to mimic the pots turned to max in parallel and use a summing opamp with pots to make an eq?

derek

1/21/2022 09:38:03 am

I've never used one before, but I wonder if you could replace C1 and C2 with variable capacitors? Might save from socket/experimenting, or might be more trouble than it's worth

Dery Mcninen

8/1/2024 12:22:16 pm

What values would you suggest for frequency range wider than a guitar one? I'm looking to use this circuit as a part of a mic preamp. Would that be feasible?

Active Tilt Equalizer

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