Frequency Splitter Design

[aziltz]

good stuff man.  i can't wait to hear if it works out!

[Lurco]

Chris: you got Lowpass and Highpass mixed up!

[MikeH]

Ahh- the "klonizer"

Uh?

It's basically how a klon works.  The frequency is split, the highs go through a distortion/clipping stage (not unlike a dist+) while the lows are passed undistorted.

[Rob Strand]

It looks like it's on it's way.  You could buffer the input to the filter.

[Processaurus]

Thanks for sharing your design's schematic, I'll try this out next time I get a chance.

You could buffer the input to the filter.

Yes, 10K (because it is 10K to the virtual ground on the - input of the first opamp) input impedance would be too low for guitar, maybe a JFET buffer like at GGG would be a nice front end to the filter.  You could also throw a 1uF cap in parallel with R1, to stabilize the V_ref supply. 

[JKowalski]

Thanks for sharing your design's schematic, I'll try this out next time I get a chance.

You could buffer the input to the filter.

Yes, 10K (because it is 10K to the virtual ground on the - input of the first opamp) input impedance would be too low for guitar, maybe a JFET buffer like at GGG would be a nice front end to the filter.  You could also throw a 1uF cap in parallel with R1, to stabilize the V_ref supply. 

All good ideas, thanks.

The design wasn't really optimized for guitar, or as a finished product. I'ts pretty much just my spice model, to test the filter characteristics. I wanted to give the basic design to you guys before I left to Tuscon, cause I can't actually test it till I get back on monday. 

[JKowalski]

Alright, I finally got around to breadboarding it. It works, beautifully. However, I think I might want a steeper rolloff.... It might be more useful. It would be AMAZING to have an adjustable rolloff, but I think that would start to get overly complicated.... Maybe have a two setting switch, instead....

Back to LTspice, I guess. I'll play around with all the ideas that came up in this thread to find something that I like.  

And I just found out that there are state variable filter IC's. Some even have aux op amps built in... Expensive, though.

[earthtonesaudio]

Have you checked out switched-capacitor filter ICs?  Low parts count and high filter orders, but require a high speed (and variable) clock.

[aziltz]

did anyone take this anywhere?

[JKowalski]

did anyone take this anywhere?

I sort of trailed off, then forgot about it 

I'll get back to it someday, I still think it would be useful to have.