AMZ Mosfet Boost Tone Control

[twangquack]

Not to go tone control crazy, or anything ...

Having had pretty good success with modified BMP tone controls in my Mini-Booster and Hot Harmonics builds (but then, I did build the buffered Mini-Booster), I'd like to try to add a slightly modified version -- almost the same as the AMZ Presence/Tone #1 -- to my second AMZ Mosfet Boost build.

I like the first bone-stock Mosfet Boost, as is ... and it does (as advertised!) have a really good flat response. But for this second one, I'm combining it with another circuit and would like to try to add the BMP-type tone control. The only change I made to the AMZ Presence/Tone #1 is to reduce the .01uF cap's value down to .0092uF (as shown in my link). Yeah, not much of a change, but a very, very slight boost in the (mostly) 500-900 Hz range when the tone knob is centered.

I thought to keep things simple I'd go ahead and do the previously mentioned mod (MarkM has mentioned it, but Jack also mentions it in his instruction sheet that comes with his PCB) whereby the preferred C5K pot is removed and the 100uF cap is connected to ground. Then the BMP tone control is put just before the 100K volume pot ... that would work OK? I know this passive tone control set-up has loss associated with it without a recovery stage, but that Mosfet Boost sure is peppy!

Please check this schematic and advise me if this looks fine. I've done literally hours of search, seeking mention of something similar and only found scant mentions of thinking about it or considering it ... nothing with schems or definitive "this is what I did to accomplish that." I know this circuit is great as is, but surely someone else has tried this before!

Also, the schematic shows only a partial circuit because the working copy I just drew up (in the middle of the night, whew, got to go to bed) contains some improvements/mods Jack included in his instruction sheet ... so, not knowing whether those mods are only for purchasers of his PCBs (which are great, by the way), I've shown only the mod that's been previously discussed and that relates to the exact tone control circuit I'm most familiar with. And I'd be all ears and eyes if there's a way better "mousetrap" that isn't too component-rich! (I'm trying to fit both pedal circuits on a single stripboard) ...

[petemoore]

  That looks exactly like a BMP tone control tacked on the output of a Mosfet...er actually spliced inside the volume control, yupp, DC blocking cap on drain>BMPTC splice>VC, looks about right to me.
  This looks like a useful configuration for stompbox applications, I have a Mini-Booster into 2knob TC item, the box pilot light is lit much of the time.

[twangquack]

  That looks exactly like a BMP tone control tacked on the output of a Mosfet...er actually spliced inside the volume control, yupp, DC blocking cap on drain>BMPTC splice>VC, looks about right to me.
  This looks like a useful configuration for stompbox applications, I have a Mini-Booster into 2knob TC item, the box pilot light is lit much of the time.

Thank you! Yeah, I thought it seemed OK but after many hours of no sleep (and lots of solder fumes earlier), even fairly simple stuff seems wonky (like just getting up to go to the bathroom). And yeah, I'm totally diggin' my Mini-Booster with that tone and mid-scoop control. After making the 10uF cap switchable and modifying my Mini-Booster to operate both 9v and 18v, it's a fun pedal. With a Tele and blackface Fender amp there's loads of spank!

[askwho69]

CA we use 2n7000 tranny for this booster?