The BJFE Sparkling Yellow Overdrive V2 is an overdrive pedal from BJFe, aimed at low-gain American amp-style tones. The pedal exists in two forms: an original 3-knob version that was a short BJFE Customshop run, and a 4-knob production version made by Bearfoot that adds an M knob. The sound it is after, in the words of the Guitar FX Layouts write-up, is "supposed to have that old school early American tones, think Fender Tweed, Blonde, and Brownface"1.
The two versions
The original 3-knob Sparkling Yellow Overdrive was a short BJFE Customshop run rather than a regular production pedal. Bearfoot later made a 4-knob production version of the Sparkling Yellow Overdrive, adding the M control1.
The builder behind the Guitar FX Layouts page, who laid out both versions, came down clearly in favor of the later one: "I big improvement over the 3-knob version"1.
Circuit and sound
The Sparkling Yellow shares its circuit topology with the BJFE Dyna Red Distortion, a distortion design from the same designer, but uses different component values to reach its lower-gain, American-voiced character. The treble setup is exactly the same as the Dyna Red's, using the same cap and pot value, with a 47nF cap attached to the treble control1.
For the active device, the write-up reports: "I guessed and used a 2N5457 - it works." The 2N5457 is a common JFET, which matters mainly to anyone building the circuit on stripboard1.
Controls
The 4-knob version's M knob is the headline addition. Its behavior runs opposite to what many players expect1:
- Clockwise, the sound gets thinner
- Counterclockwise, it gets thicker and bassier1
On naming, the write-up notes that "seems like bearfoot calls it \"M\" knob while BJFE calls it \"Nature\"", so the two labels refer to the same control1.
The M pot can oscillate at near-counterclockwise settings. The documented fix raises the 100pf cap between IC pins 1 and 8 to 220pf and adds a 1k trimmer between M pot lug 2 and ground. The Guitar FX Layouts author reported: "I fixed it by upping the value of the 100pf cap connecting IC pin 1 and 8 to 220pf and adding a 1k trimmer between M pot"1.
What builders and players report
The Guitar FX Layouts page is a stripboard layout resource, so its verdicts come from building and playing the circuit rather than from the maker. Two findings stand out for anyone chasing this pedal or building one:
- The stock treble control was not especially useful as delivered. Swapping the Treble pot for an audio taper (A50K) "made enough difference as to make it useful. Really recommend an A50K for T"1.
- The 4-knob version with the M control is, in the builder's words, a big improvement over the 3-knob version1.
The Sparkling Yellow sits in a family of amp-flavored overdrive pedals from BJFe, alongside designs such as the BJFe Honeybee Overdrive and the BJFE in Your Hand series Honey Bee OD 4K1.
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Questions
What transistor does the BJFE Sparkling Yellow Overdrive V2 use?
The circuit uses a JFET, and the Guitar FX Layouts write-up reports that a 2N5457 works in the build, with the author noting he guessed at that part and it worked. Builders reproducing the circuit on stripboard have used the 2N5457 in that position.
What is the difference between the 3-knob and 4-knob Sparkling Yellow?
The 3-knob version was a short BJFE Customshop run, while Bearfoot makes a 4-knob production version that adds an M knob. The M control gets thinner clockwise and thicker and bassier counterclockwise. The builder behind the Guitar FX Layouts page called the 4-knob version a big improvement over the 3-knob version.
Is the Sparkling Yellow the same circuit as the Dyna Red Distortion?
It shares the same circuit topology as the BJFE Dyna Red Distortion, but with different component values. The treble setup is exactly the same as the Dyna Red's, using the same cap and pot value, with a 47nF cap attached to the treble control.
Is the M knob the same as the Nature knob?
Yes, as far as the Guitar FX Layouts write-up could tell: Bearfoot calls the control the M knob while BJFE calls it Nature. It behaves the same way either way, thinning the sound clockwise and making it thicker and bassier counterclockwise.
Does the 4-knob version fix the M pot oscillation?
The M pot can oscillate at near-counterclockwise settings. A documented fix raises the 100pf cap between IC pins 1 and 8 to 220pf and adds a 1k trimmer between M pot lug 2 and ground, which the Guitar FX Layouts author used to cure the problem in his build.
Sources (1)
- Guitar FX Layouts: BJFE Sparkling Yellow Overdrive V2, Guitar FX Layouts (tagboardeffects.blogspot.com), 2026-01-18
