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125B · 4 knobs

Aion FX

AscalonOctave Fuzz

Based on the King Tone Octaland· 1 other board clones it

Category
Fuzz· Octave fuzz
Controls
Drive · Voice · Blend · Volume
Difficulty
Easy
Price
$12.50in stock

From the vendor

A vintage-flavored octave fuzz based on the Roger Mayer Octavia with an added clean blend and dual-stage tone control.

The Ascalon Octave Fuzz is based on the King Tone Octaland Mini, first released in 2019 as an updated version of the original Octaland. It was traced by Aion FX in 2024.

At its core, the octave section is adapted from the Roger Mayer Octavia, which also served as the inspiration for the Catalinbread Octapussy. But it expands a lot on the classic circuit with the addition of a clean blend (useful for retaining low end) and an innovative two-stage tone control, along with an input capacitor selection and more circuit tweaks by way of internal DIP switches.

King Tone released an updated version of the Octaland Mini in 2022, moving the DIP switches to the outside and adding some extra options. Our trace was from a 2020 unit, so we do not know what changes were made in this version.

The Ascalon is a direct adaptation of the Octaland Mini with no modifications or changes other than some minor tweaks to the power supply to standardize it with our other projects.

Note: This project uses a type of capacitor that has been temporarily discontinued by WIMA. Please see our news article about the issue and the substitution spreadsheet for project-specific recommendations. We are stocking a limited supply in the mean time. The build document has not yet been updated to reflect this.

Schematic

The schematic is in the vendor's build document, page 7. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 70 rows

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RefValueNormalizedTypeNotes
Resistors 30
R12M2MMetal film resistor, 1/4W
R2750k750kMetal film resistor, 1/4W
R31k1kMetal film resistor, 1/4W
R41k1kMetal film resistor, 1/4W
R510k10kMetal film resistor, 1/4W
R610k10kMetal film resistor, 1/4W
R71M1MMetal film resistor, 1/4W
R8487k487kMetal film resistor, 1/4W
R9100k100kMetal film resistor, 1/4W
R1010k10kMetal film resistor, 1/4W
R113M3MMetal film resistor, 1/4W
R12360k360kMetal film resistor, 1/4W
R1320k20kMetal film resistor, 1/4W
R14510R510Metal film resistor, 1/4W
R1551k51kMetal film resistor, 1/4W
R16100k100kMetal film resistor, 1/4W
R17220k220kMetal film resistor, 1/4W
R183M3MMetal film resistor, 1/4W
R19360k360kMetal film resistor, 1/4W
R2020k20kMetal film resistor, 1/4W
R21510R510Metal film resistor, 1/4W
R2210k10kMetal film resistor, 1/4W
R23100k100kMetal film resistor, 1/4W
R241M1MMetal film resistor, 1/4W
R251M1MMetal film resistor, 1/4W
R2610k10kMetal film resistor, 1/4W
R2715k15kMetal film resistor, 1/4W
R28100R100Metal film resistor, 1/4W Power supply filter resistor.
RPD2M22.2MMetal film resistor, 1/4W Input pull-down resistor.
LEDR10k10kMetal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 19
C1220n220nFilm capacitor, 7.2 x 2.5mm
C25n15.1nMLCC capacitor, NP0/C0GSee build notes for capacitor selection.
C35n65.6nFilm capacitor, 7.2 x 2.5mm
C422uF22uElectrolytic capacitor, 5mm
C52n22.2nFilm capacitor, 7.2 x 2.5mm
C6100n100nFilm capacitor, 7.2 x 2.5mm
C7220n220nFilm capacitor, 7.2 x 2.5mm
C8220n220nFilm capacitor, 7.2 x 2.5mm
C915n15nFilm capacitor, 7.2 x 2.5mm
C104.7uF4.7uElectrolytic capacitor, 4mm
C111uF1uFilm capacitor, 7.2 x 3.5mm
C12100n100nFilm capacitor, 7.2 x 2.5mm
C131uF1uFilm capacitor, 7.2 x 3.5mm
C141uF1uFilm capacitor, 7.2 x 3.5mm
C1522n22nFilm capacitor, 7.2 x 2.5mm
C16100n100nFilm capacitor, 7.2 x 2.5mm
C1733n33nFilm capacitor, 7.2 x 2.5mm
C18100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C19100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 3
D11N58171N5817Schottky diode, DO-41
D21N9141N914Fast-switching diode, DO-35
D31N9141N914Fast-switching diode, DO-35
Transistors 5
Q12N50892N5089BJT transistor, NPN, TO-92Can substitute BC549C (rotate 180 degrees)
Q22N39042N3904BJT transistor, NPN, TO-92
Q32N39042N3904BJT transistor, NPN, TO-92
Q42N39042N3904BJT transistor, NPN, TO-92
Q52N39042N3904BJT transistor, NPN, TO-92
Potentiometers 4
BLEND50kBB50k16mm right-angle PCB mount pot
DRIVE1kCC1k16mm right-angle PCB mount pot
VOICE50kBB50k16mm right-angle PCB mount pot50kW in original. See build notes.
VOLUME100kBB100k16mm right-angle PCB mount pot
Trimmers 1
BIAS10k10kTrimmer, 10%, 1/4"Bourns 3362P or similar.
Switches 3
INPUTSPDT center offSPDT CENTER OFFToggle switch, SPDT on-off-on
SW1DIP switch, 2-pos.DIP SWITCH, 2-POS.DIP switch, 2-position
FSW3PDT3PDTStomp switch, 3PDTAvailable from Aion FX.
Jacks & sockets 3
IN1/4" stereo1/4" STEREO1/4" phone jack, closed frameSwitchcraft 112BX or equivalent.
OUT1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X or equivalent.
DC2.1mm2.1MMDC jack, 2.1mm panel mountLumberg NEB/J 21 C or equivalent.
Hardware 2
BATTBattery snapBATTERY SNAP9V battery snapOptional. Use the soft plastic type—the hard-shell type will not fit.
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.

Other boards based on the King Tone Octaland