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Thursday, April 19, 2018

Active Baxandall Network

Got a request for a Baxandall tone stack daughter board, (much like the Big Muff Tone Stack daughter board) and thought it was a great idea as it's a great tone control. The schematic for this came from this article, which is worth the read. I've laid it out two ways, one with board mounted pots, and one without that's a little more compact.


Note on the board mounted pots version the fill on the PCB is not ground.

38 comments:

  1. Verified - I did the smaller layout, on perf.

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  2. where is it placed, before or after the main board?

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    1. You could try either place, but I would think after would be the most effective.

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    2. Owsem! Let's see how if it is stacked to OD-1

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  3. can i add a split n blend to make it a new pedal? just asking.. thanks

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    1. You could. Or just throw a buffer in front and have and make a 2-band EQ.

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  4. I don't know, man.
    Never have I constructed a baxandall that actually sounded good/useful to my ears. It seems as though the circuit works just to drop the entire frequency range and then allows you to reintroduce the top and bottom end (albeit unfaithfully and never full-throttle).

    Perhaps something in the nature of the baxandall circuit solicits the need for a gain stage prior to the EQ? or even a post-EQ "recovery" stage? I thought the "active" implement here would counteract the need for such? idk

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    1. so, you dont like fx like BB pre, AC/RC, spark booster?
      or you need like 3 baxandall?

      what about James tonestack?

      i think you just want say, baxandall isn't your taste?
      me too. Hahaha

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  5. What about one of these with a Marshall BMT tone stack?

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  6. Only bass and trebel control
    How to add mid control?

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    1. If you swap out the resistor from Bass 1 to ground with a 15-50k potentiometer wired as a variable resistor, you'll have a mid control, but it's more accurate to say that it varies the amount of scoop, because it's really varying the corner frequency of the Bass filter. It's not the same as an FMV tone stack by a lot, but gives you a mids control.

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  7. New guy here, I was wondering, what would the frequencies be for the bass and treble control? Would there be a way to determine what frequencies the bass and treble knobs control? Also, would the there be a 'flat' setting, all the way ccw, cw, or straight up the middle? Thanks :)

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  8. Hi! Could it work as a tone control integrated into a bass guitar?

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    1. You could try it, but it's definitely not designed for that. I'm working on an on-board bass preamp that'll be out soon.

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  9. Any onboard preamp pcb for bass

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  10. Plz want to any good onboard bass preamp

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  11. Built it.it works but i have a volume drop issue..any suggestion on how to solve this? Thanks a bunch

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  12. Hi , how can i connect baxandall or other with distrotion in circuit?
    Plz explain i'm beginner..
    Thanks for knowledge

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    1. Easiest way would be to just take the output of whatever circuit you're adding this to and running it to the input of this baxendall layout. Then the baxendall out becomes the output for the whole thing.

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  13. Thank you
    One question, what happens? if i connect passive baxendall with 9v distrotion
    Dose it work?

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  14. where i can find print layout in misc???
    searching but didnt find.

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  15. This comment has been removed by the author.

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  16. Just like JunmarFusillero up here, I also have a significant volume drop. Any ideas? Thanks a million!

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  17. https://www.youtube.com/watch?v=7VQVhnGZY90
    this layout + Split n blend

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  18. Hi! If I wanna tuck simple volume control after it, potentiometer with lug 3 to output caps, lug 1 to ground and output jack from lug 2, what value will be the best? 10K, 100k or 1 Meg?

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  20. tried 4 tl071, any of them doesnt work on this circuit, I tried breadboarding with one side of ne5532 dual opamp and it works. Any opinions on this stuation? Are my tl071s bad or what

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  21. Ismail the TL071 is a single op amp and will not work in this circuit. Your ne5532 is a dual op amp device.

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