Akashic Guitar effects PCB lookup
TIGHTFUZZTONEVOLUME

125B · 4 knobs

Aion FX

CinderHybrid Fuzz

Based on the Amptweaker Tight Fuzz

Category
Fuzz· Transistor fuzz
Controls
Tight · Fuzz · Tone · Volume
Difficulty
Intermediate
Price
$12.50in stock
Buy the PCB at Aion FX Build document1.0.0 (2023-11-24) Mouser parts spreadsheet googleTracing Journal link

From the vendor

A vintage-inspired fuzz/booster with several tone options, most notably a switch to select between germanium and silicon transistors.

The Cinder Hybrid Fuzz is based on the Amptweaker Tight Fuzz, a combination silicon/germanium fuzz first released in 2012 and traced by Aion FX in 2023.

The Tight Fuzz shares several concepts with the other drive pedals in the Amptweaker lineup like the Tight Metal and Tight Drive, wrapping the vintage-inspired fuzz with James Brown’s signature pre-gain bass cut control as well as a heavily modified Big Muff-style tone control.

As with the Tight Metal, there are several toggle switch options, changing between silicon and germanium transistors, ‘60s/’70s EQ, and a sharp or smooth fuzz tone. All in all, it’s a great modernized take on the classic fuzz topologies.

The Cinder is based on our trace of the Tight Fuzz, which you can read about in the tracing journal. The only difference is the omission of the “SideTrak” effects loop that is engaged along with the pedal.

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 73 rows

Report a wrong parse
RefValueNormalizedTypeNotes
Resistors 30
R1475k475kMetal film resistor, 1/4WCan substitute 470k.
R21k51.5kMetal film resistor, 1/4W
R322k122.1kMetal film resistor, 1/4WCan substitute 22k.
R41k51.5kMetal film resistor, 1/4W
R51k51.5kMetal film resistor, 1/4W
R622k122.1kMetal film resistor, 1/4WCan substitute 22k.
R747k547.5kMetal film resistor, 1/4WCan substitute 47k.
R8100k100kMetal film resistor, 1/4W
R91k1kMetal film resistor, 1/4W
R10475R475Metal film resistor, 1/4WCan substitute 470R.
R111k51.5kMetal film resistor, 1/4W
R126k816.81kMetal film resistor, 1/4WCan substitute 6.8k.
R13150k150kMetal film resistor, 1/4W
R14150k150kMetal film resistor, 1/4W
R15150k150kMetal film resistor, 1/4W
R1610k10kMetal film resistor, 1/4W
R174k754.75kMetal film resistor, 1/4WCan substitute 4.7k.
R181k51.5kMetal film resistor, 1/4W
R192k742.74kMetal film resistor, 1/4WCan substitute 2.7k.
R204k754.75kMetal film resistor, 1/4WCan substitute 4.7k.
R21220k220kMetal film resistor, 1/4W
R22330k330kMetal film resistor, 1/4W
R2347k547.5kMetal film resistor, 1/4WCan substitute 47k.
R2447k547.5kMetal film resistor, 1/4WCan substitute 47k.
R2547k547.5kMetal film resistor, 1/4WCan substitute 47k.
R261k1kMetal film resistor, 1/4W
R2747k547.5kMetal film resistor, 1/4WCan substitute 47k.
R2847R47Metal film resistor, 1/4W
RPD1M1MMetal film resistor, 1/4WInput pulldown resistor.
LEDR10k10kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 22
C147pF47pMLCC capacitor, NP0/C0G
C2100n100nFilm capacitor, 7.2 x 2.5mm
C3100n100nFilm capacitor, 7.2 x 2.5mm
C4100n100nFilm capacitor, 7.2 x 2.5mm
C522uF22uElectrolytic capacitor, 5mm
C61n21.2nFilm capacitor, 7.2 x 2.5mm
C74.7uF4.7uElectrolytic capacitor, 4mm
C822uF22uElectrolytic capacitor, 5mm
C9100n100nFilm capacitor, 7.2 x 2.5mm
C1047pF47pMLCC capacitor, NP0/C0G
C1147n47nFilm capacitor, 7.2 x 2.5mm
C1222uF22uElectrolytic capacitor, 5mm
C13100n100nFilm capacitor, 7.2 x 2.5mm
C1433n33nFilm capacitor, 7.2 x 2.5mm
C1547n47nFilm capacitor, 7.2 x 2.5mm
C16220n220nFilm capacitor, 7.2 x 2.5mm
C171n21.2nFilm capacitor, 7.2 x 2.5mm
C18100n100nFilm capacitor, 7.2 x 2.5mm
C19220n220nFilm capacitor, 7.2 x 2.5mm
C2047uF47uElectrolytic capacitor, 5mmReference voltage filter capacitor.
C21100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C22100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 2
D11N58171N5817Schottky diode, DO-41
D21N9141N914Fast-switching diode, DO-35
Transistors 3
Q12N50882N5088BJT transistor, NPN, TO-92
Q22N50882N5088BJT transistor, NPN, TO-92
Q3AC127AC127Germanium transistor, NPNAny NPN above 80-100 hFE will work, i.e. 2N1304 from SBE.
ICs 2
IC1TL072TL072Operational amplifier, dual, DIP8
IC2TL072TL072Operational amplifier, dual, DIP8
Potentiometers 4
TIGHT100kCC100k16mm right-angle PCB mount potReverse audio (reverse log or antilog) taper.
FUZZ10kC dual10KC DUAL16mm right-angle PCB mount pot, dualReverse audio (reverse log or antilog) taper, dual-ganged.
TONE10kBB10k16mm right-angle PCB mount potLinear taper.
VOLUME100kAA100k16mm right-angle PCB mount potAudio (log) taper.
Switches 3
EDGESPDT on-onSPDT ON-ONToggle switch, SPDT on-on
TRANS.DPDT on-onDPDT ON-ONToggle switch, DPDT on-on
FSW3PDT3PDTStomp switch, 3PDTAvailable from Aion FX.
LEDs 1
LED5mm5MMLED, 5mm, red diffused
Jacks & sockets 5
IC1-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IC2-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IN1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X 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 1
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.