Akashic Guitar effects circuit lookup
TREBLEMIDS SWGATERINGER

Enclosure not stated · 4 knobs

Dirtbox Layouts

Capitalist Death Cult YukagirVerified

Based on the Capitalist Death Cult Yukagir

Category
Fuzz
Controls
Treble · Mids SW · Gate · Ringer
Build
Vero· 20×24· 36 cuts, 21 links
Layout
Verified · Dirtbox Layouts marks it as built and working
Tags
Apocalypse Audio, Capitalist Death Cult, Chris Stelloh, Fuzz, Octave

From the post

Another guest appearance with a verified layout by Chris at Capitalist Death Cult! Here is what he has to say about this bass fuzz monster:

Capitali$t Death Cult Effect$ YUKAGIR Preserved Siberian Fuzz

The Yukagir (pronounced Yookahgeer) Preserved Siberian Fuzz is named after a 39K year old Wooly Mammoth fossil that was unearthed in Siberia in 2002. This effect was basically the distortion I needed to make use of the NOS Soviet military germanium transistors and diodes I've amassed a collection of.

Essentially - this is a "Green Ringer" style octave noisemaker with a jfet blend control that is followed by a burly PNP germanium fuzz+distortion that works equally well for bass or guitar. The germanium transistors are MP42B's, and the diodes are germanium D311's - both originally manufactured in the 1970s for the Soviet military.

The original inspiration for the fuzz came from the Apocalypse Audio H Fuzz - and it bears some tonal similarities to the Zvex Wooly Mammoth/Mastotron. I added a voltage inverter to the fuzz circuit so that it can function with a regular 9V/negative tip power supply like a One Spot.

The controls are as follows:

INPUT: fuzz gain - it will squeal when you max it. TREBLE: tone control, that mostly adds high end definition as you turn it clockwise. OUTPUT: master level MIDS: a three way switch that is almost flat to the left, scooped in the middle, and boosted to the right GATE: this knob is highly interactive with the mids switch and input knob - it will also filter some of the lows as you turn it clockwise. RINGER: this is the octave blend control - this knob will also interact with the gate, as the level of octave will cause some velcro-ish sputtering of its own.

The footswitch on this unit is the Demedash Incandenza relay "soft click" design and will last WAY longer than a mechanical switch, and is super reliable. However - depending on your power supply and whether or not you daisy-chain others to that supply, the pedal will either default to powering up or down every time you disconnect it. Kind of like how Boss pedals are always on every time you power them up with a One Spot.

There are a lot of different tonal possibilities in this box - from gated and sputtering to roaring bass-heavy blare, as well as some FZ-2 style boosted+scooped octave fuzz tones, too.

All handbuilt and finished by just me (Chris) in my garage in central coast California!

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 Dirtbox Layouts. No KiCad fragment has been drawn for this circuit yet.

Parts list 41 rows

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Check before you build · 1 value the reader of this layout was not sure of
  • 33k at column 12 rows A-C: partly covered by the 47uF can next to it, read as 33k
RefValueNormalizedTypeNotes
Resistors 11
×410k10kread from the layout by eye
×447k47kread from the layout by eye
×31M1Mprinted 1m; read from the layout by eye
×222k22kread from the layout by eye
×22k22.2kread from the layout by eye
×2100k100kread from the layout by eye
×1100R100read from the layout by eye
×11k1kread from the layout by eye
×133k33kread from the layout by eye
×139k39kread from the layout by eye
×1470k470kread from the layout by eye
Capacitors 13
×1100pF100pread from the layout by eye
×2150pF150pread from the layout by eye
×1680pF680pread from the layout by eye
×16n86.8nread from the layout by eye
×110nF10nread from the layout by eye
×122nF22nread from the layout by eye
×168nF68nread from the layout by eye
×4100nF100nread from the layout by eye
×1220nF220nread from the layout by eye
×21uF1uelectrolytic; read from the layout by eye
×110uF10uelectrolytic; read from the layout by eye
×447uF47uelectrolytic; read from the layout by eye
×1100uF100uelectrolytic; read from the layout by eye
Diodes 4
D11N58191N5819read from the layout by eye
D2D311D311germanium; D311 germanium OR 1n5817; read from the layout by eye
D3D311D311germanium; D311 germanium OR 1n5817; D3+D4 should be matched; read from the layout by eye
D4D311D311germanium; D311 germanium OR 1n5817; D3+D4 should be matched; read from the layout by eye
Transistors 6
Q12N50892N5089read from the layout by eye
Q22N50872N5087read from the layout by eye
Q32SK302SK30JFET; read from the layout by eye
Q42N50892N5089read from the layout by eye
Q5MP42BMP42BPNP germanium, min hfe 60-70; read from the layout by eye
Q6MP42BMP42BPNP germanium, min hfe 60-70; read from the layout by eye
ICs 1
IC1TC1044TC1044read from the layout by eye
Potentiometers 5
InA100KA100kPotentiometerread from the layout by eye
OutA100KA100kPotentiometerread from the layout by eye
GateA100KA100kPotentiometerread from the layout by eye
TrebleB50KB50kPotentiometerread from the layout by eye
RingerB50KB50kPotentiometerread from the layout by eye
Switches 1
Mids SWDPDT on/off/onDPDT ON/OFF/ONtoggle; read from the layout by eye