Akashic Guitar effects circuit lookup
FUZZTREBVOL

1590B · 3 knobs

Fuzz Dog· sandofgod

Sand of God

Based on the OKKO Holy Grit· 2 other boards clone it

Category
Fuzz
Controls
Fuzz · Treb · Vol
Difficulty
Medium
Price
£38.40
Tags
fuzz

From the vendor

OK. This one here is an absolute gem. There are so many different textures available from this box you'd swear it was ten different pedals.

Kinda sorta Tone Bender MkII Topology with all sorts of bells and whistles going on.

Up front you have a switchable buffer section. Flip it on to place this anywhere in your chain. Turn it off if you're placing it up front and want that classic guitar/fuzz interaction and silky smooth clean-up with your volume pot.

The fuzzy section has - guess what? - a fuzz control. Nice to see they've gone for a reverse log here - it's an absolute must. There's a three-way toggle to switch between three very distinct bias settings for Q3. There are factory settings for these detailed in the build doc, but there's nothing stopping you going more or less extreme to get your own flavours. Honestly, the original specs offer more than enough variation. There's also a BASS pot to increase/limit the frequency range hitting Q2. This makes a big difference to the fuzz texture. Chuck in the TREBle bleed control to tame everything for bright amps and it adds up to a solid winner.

The kit is supplied with vertical-mount pots which have round shafts, so you'll need set-screw fitting knobs.

If you want the PCB without parts there's a link for that at the bottom of the page.

Partial kit: PCB, all board-mounted components, pots.

Full kit: As above, plus footswitch and appropriate daughterboard/components for your selected bypass type (see Downloads section for details of those), jack sockets, DC socket, battery snap, hook-up wire, LED.

Enclosure (pre-drilled) is available as an option with full kits, and will not take a battery. Knobs are not included.

Builds are only available with full kits including enclosures. Please choose appropriate knobs.

Inspired by: Holy Grit

Difficulty: Medium

PCB size: 50 x 50mm

Knobs required: 4

Enclosure: 1590B

Direct-Connect compatible (4-way)

Download the INSTRUCTION PDF

Schematic

The schematic is in the vendor's build document, page 3. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 38 rows

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RefValueNormalizedTypeNotes
Resistors 16
R147K47k
R21M1M
R31M1M
R41M1M
R510K10k
R615K15k
R72K22.2k
R8100K100k
R947K47k
R1022K22k
R111K1k
R1210K10k
R13100R100
R141K1k
R15100K100k
R1651R51
Capacitors 11
C1100n100n
C210u10uElectrolytic capacitor
C32u22.2uElectrolytic capacitor
C44n74.7n
C56n86.8n
C647p47p
C7220p220p
C8100n100n
C915n15n
C10100u100uElectrolytic capacitor
C1122u22uElectrolytic capacitor
Diodes 1
D11N58171N5817
Transistors 4
Q1BC182BBC182B
Q2BC107ABC107A
Q32N30532N3053
Q4BC182BBC182B
Potentiometers 3
FUZZ1KCC1kPotentiometer
TREB10KBB10kPotentiometer
VOL100KAA100kPotentiometer
Trimmers 3
BOT20K20k
MID20K20k
TOP20K20k

Other boards based on the OKKO Holy Grit