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Nice work!

I'm cooking up a dual opamp version that mimics the Clapton MB in its entirety. Useful IF you need the extra 12dB boost.

This is a minimalist version of the Clapton Mid Boost. Instead of discrete transistors, I used an opamp. There is only one knob: MID BOOST. The freq response is similar to the Clapton Mid Boost, with a broad focus on the mids. With the component values shown, the midrange is a little more...

Interesting, but it's mainly a thought experiment. Unless we use a quad transistor IC such as MPQ3904, then we're still going to have some unpredictable behavior because the Vbe and HFE of the transistors won't be matched.

Interesting. The same mid boost/cut circuit as the JHS Haunting Mids, with some minor component value tweaks. Basically a Wien Bridge filter inside a feedback loop.

Surely, everyone is looking at everyone else's designs. The Baxandall-style MID control is always going to be broad and unfocused because there is no combination of component values that will provide a Q high enough. I could have left the BASS & TREBLE circuit intact and implemented only the...

Ja.

I've been playing around with the EQ stage and I finally settled on this. This mod is too extensive to be practical on a production pedal or a PPCB board. But is does sound good and is very versatile. The TREBLE knob has more range and can get much brighter than the original design. The...

Nice! Can we see the front panel?

Right! And from Sweetwater: "Plug the ENGL Powerball pedal into your favorite guitar amplifier, and you'll instantly turbocharge it with the paint-peeling high-gain tone of ENGL's Powerball II head. Based on the Powerball II's Lead 2 channel, this distortion pedal employs analog circuitry to...

Agreed. Arrange the layout and device pairing so that it flows from input to output when dealing with high-gain circuits. With low-gain circuits like a phase-shifter, any opamp pairing is fair game. First two stages - lower right; middle two stages - lower left; last two stages - upper left...

Robert does that just to mess with our minds. ;)

Every so often, I have to comb thru the sales side of this website to see what's new. This one caught my eye 4 years ago and then was left to languish in my pedal circuit collection. Until now. I have a few mods in mind. Some minor, some not so minor. Mainly dealing with EQ and headroom.

The pedal circuit bears a strong resemblance to the Friedman BE-OD line of pedals. I gotta say I like the tone of this one better. Very nice overtones. Good gain range. I was unsure about the EQ section for two reasons: 1. The TREBLE control is tuned very high up in the freq spectrum...

I'm going to have to breadboard that one. There's a whole lotta EQ going on there.

I have not. Wasn't aware that MC14xxx parts were still in production. I'm curious too. Looks like they're only available as SMD. I don't mind building boards with SMD ICs, but they suck for breadboarding.

The Final Schematic in post #19 is the Final Schematic. As much as I could, I kept the ref des from the PPCB Build Docs dated 3/20/24. The Idss spec for J201 is 0.2mA to 1.0mA. Any part that measures outside that range is suspect. SRPP circuits like this are very sensitive to Crs (gate-drain...

Hmmmmm. Maybe. Three concerns: 1. Putting a filter inside a negative feedback loop inverts its transfer function. Mid-cut becomes mid-boost, etc. In the F configuration, the feedback gain can go to zero, which means the close-loop gain becomes very very large. 2. If the filter's phase-shift...

If you're looking for another transparent boost, or another JFET OD, then this could be it. I don't envision any other changes. I'm definitely not going to add any knobs. It would be nice if someone else could chime in on either the original or the mod. After all, I might be full of :poop:.

I have a wee mod. BIAS works better, FUZZ goes to 11. Dime INPUT and it gets pretty nahsty when FUZZ is above 7 (2:00). Q3 -> J113 R9 -> 47K R10 -> 4.7K R11 -> 3.3K FUZZ -> A250K BIAS -> B25K R12 -> adjust to get approx 1.7V across R11 with BIAS at zero. 2.7K on my breadboard.