Akashic Guitar effects circuit lookup
FATFUZZBIASTONEVOLUME

Enclosure not stated · 5 knobs

Tagboard Effects

Basic Audio Scarab DeluxeVerified

Based on the Basic Audio Scarab Deluxe· 6 other boards clone it

Category
Fuzz
Controls
Fat · Fuzz · Bias · Tone · Volume
Build
Vero· 18×11· 14 cuts, 4 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Fuzz

From the post

Info about this great sounding fuzz pedal from John Lyons of Basic Audio, and thanks to him for the information he shared about the circuit. Check out this and his other pedals here:

A straight ahead refined vintage era fuzz along the lines of the Tonebender with lots of sustain and gain. Tone control smooths out the high end but is very usable at all settings. All gain and tone settings remain articulate and sweet throughout their range. Full fuzz sound with the clarity of an overdrive.

This is a "Deluxe" version of the Scarab with more control over "feel" and adjustments in bias. This version adds in a couple knobs over the 3 knob version.

BIAS: Tonebender type circuits vary depending on the bias of the 3rd transistor. Gritty gated tones on one end of the dial, sustaining lead tones in the middle and sweet lower gain tones at the other end of the rotation. Bias affects tone and gain.

FAT: The low end at the input of the circuit affects fuzz amount and saturation. The feel of the pedal can be adjusted from a saturated slower responding "fat fuzz" to a snappy, fast responding, slightly less gain fuzz that has the feel of a distortion or overdrive. This helps dial in a single coil to be fat or a humbucker to clear up a bit and be more sensitive to dynamic picking.

Schematic

This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.

Parts list 23 rows

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RefValueNormalizedTypeNotes
Resistors 9
×410K10kread from the layout by eye
×2100R100read from the layout by eye
×21K1kread from the layout by eye
×1750R750read from the layout by eye
×1150K150kread from the layout by eye
×122K22kread from the layout by eye
×11M1Mread from the layout by eye
×147K47kread from the layout by eye
×12K22.2kread from the layout by eye
Capacitors 5
×110n10nread from the layout by eye
×3100n100nread from the layout by eye
×110u10uelectrolytic; read from the layout by eye
×14u74.7uelectrolytic; read from the layout by eye
×1100u100uelectrolytic; read from the layout by eye
Transistors 4
Q12N50882N5088read from the layout by eye
Q22N50882N5088read from the layout by eye
Q32N50882N5088read from the layout by eye
Q42N50882N5088read from the layout by eye
Potentiometers 5
FatB100KB100kPotentiometerread from the layout by eye
FuzzB1KB1kPotentiometerread from the layout by eye
BiasB25KB25kPotentiometerread from the layout by eye
ToneB50KB50kPotentiometerread from the layout by eye
VolumeA100KA100kPotentiometerread from the layout by eye

Other boards based on the Basic Audio Scarab Deluxe