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DRIVESUSTAINBIASTONEVOLUME

125B · 5 knobs

Aion FX

Nysiad GermaniumFuzz

Based on the Cornish NG-2

Category
Fuzz· Misbiased fuzz
Controls
Drive · Sustain · Bias · Tone · Volume
Difficulty
Intermediate
Price
$12.50in stock

From the vendor

A variable-bias silicon & germanium fuzz designed to emulate “imminent amp death”, the sound of a blown power tube or output transformer right before it all goes up in smoke.

The Nysiad Germanium Fuzz is an adaptation of the Cornish NG-2, originally traced by Aion FX in 2024. While it has a lot in common with the later NG-3 (available as our Nysiad Silicon project), there are enough substantial differences that we split them into two different projects.

Like the NG-3, the NG-2 is designed to simulate “imminent amp death”, the sound of a bad output transformer or power tube right before the fuse blows (or worse). You can get some fairly traditional sounds from it if the bias knob is all the way up, but once you start to dial it down, the tone quickly turns into a glitchy mess, complete with gating, sag, feedback, velcro, instability, and anything else you’d associate with a misbiased fuzz.

The main difference in the NG-2 is the use of germanium transistors for the clipping stage, as compared to the silicon transistors in the NG-3. On the original NG-2, the bias control was an internal trimmer, but in this adaptation we made it external like the NG-3, which means that the transistors are the main difference between the two projects.

Other than the bias control, the Nysiad Germanium is identical to the NG-2 unit that we traced. As with our other Cornish-based projects, we have added an internal slide switch for a true bypass mode not found in the original.

Schematic

The schematic is in the vendor's build document, page 8. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 92 rows

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RefValueNormalizedTypeNotes
Resistors 43
R110M10MMetal film resistor, 1/4W
R21k1kMetal film resistor, 1/4W
R3120k120kMetal film resistor, 1/4W
R4120k120kMetal film resistor, 1/4W
R5200k200kMetal film resistor, 1/4W
R67k57.5kMetal film resistor, 1/4W
R710k10kMetal film resistor, 1/4W
R851R51Metal film resistor, 1/4W
R9100k100kMetal film resistor, 1/4W
R101M1MMetal film resistor, 1/4W
R111M1MMetal film resistor, 1/4W
R123k93.9kMetal film resistor, 1/4W
R1310k10kMetal film resistor, 1/4W
R141k51.5kMetal film resistor, 1/4W
R15470k470kMetal film resistor, 1/4W
R1651k51kMetal film resistor, 1/4W
R1710k10kMetal film resistor, 1/4W
R181k1kMetal film resistor, 1/4W
R193k93.9kMetal film resistor, 1/4W
R2030k30kMetal film resistor, 1/4W
R2175R75Metal film resistor, 1/4W
R22220k220kMetal film resistor, 1/4W
R2310k10kMetal film resistor, 1/4W
R2468k68kMetal film resistor, 1/4WJumper in original, but 68k gives better control range for external pot.
R2530k30kMetal film resistor, 1/4W
R2612k12kMetal film resistor, 1/4W
R2727k27kMetal film resistor, 1/4W
R2827k27kMetal film resistor, 1/4W
R29330k330kMetal film resistor, 1/4W
R30100k100kMetal film resistor, 1/4W
R31120k120kMetal film resistor, 1/4W
R32120k120kMetal film resistor, 1/4W
R33200k200kMetal film resistor, 1/4W
R345k15.1kMetal film resistor, 1/4W
R3510k10kMetal film resistor, 1/4W
R3691R91Metal film resistor, 1/4W
R37100R100Metal film resistor, 1/4W
R38100R100Metal film resistor, 1/4W
R39100R100Metal film resistor, 1/4W
R40100R100Metal film resistor, 1/4W
R4191R91Metal film resistor, 1/4W
R4251k51kMetal film resistor, 1/4W
LEDR10k10kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 27
C1100n100nFilm capacitor, 7.2 x 2.5mm
C24.7uF4.7uElectrolytic capacitor, 4mm
C31n1nFilm capacitor, 7.2 x 2.5mm
C422uF22uElectrolytic capacitor, 5mm
C5100n100nFilm capacitor, 7.2 x 2.5mm
C64.7uF4.7uElectrolytic capacitor, 4mm
C7100pF100pMLCC capacitor, NP0/C0G
C8220n220nFilm capacitor, 7.2 x 2.5mm
C91n1nFilm capacitor, 7.2 x 2.5mm
C101n1nFilm capacitor, 7.2 x 2.5mm
C1147uF47uElectrolytic capacitor, 5mm
C1247n47nFilm capacitor, 7.2 x 2.5mm
C134.7uF4.7uElectrolytic capacitor, 4mm
C144.7uF4.7uElectrolytic capacitor, 4mm
C151n1nFilm capacitor, 7.2 x 2.5mm
C16220n220nFilm capacitor, 7.2 x 2.5mm
C1710n10nFilm capacitor, 7.2 x 2.5mm
C1810n10nFilm capacitor, 7.2 x 2.5mm
C19100n100nFilm capacitor, 7.2 x 2.5mm
C201n1nFilm capacitor, 7.2 x 2.5mm
C214.7uF4.7uElectrolytic capacitor, 4mm
C2222uF22uElectrolytic capacitor, 5mm
C23220uF220uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C24220uF220uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C25220uF220uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C26220uF220uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C27100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 3
D11N58171N5817Schottky diode, DO-41
D21N9141N914Fast-switching diode, DO-35
Z1LM4040DIZ-5.0LM4040DIZ-5.0Zener / voltage reference, TO-92Can also use LM4040CIZ-5.0.
Transistors 6
Q1BC549CBC549CBJT transistor, NPN, TO-92
Q2NPN GeNPN GEBJT transistor, germanium, NPNSee build notes for germanium transistor selection.
Q3NPN GeNPN GEBJT transistor, germanium, NPNSee build notes for germanium transistor selection.
Q4BC549CBC549CBJT transistor, NPN, TO-92
Q5BC549CBC549CBJT transistor, NPN, TO-92
IC1-SDIP-8 socketDIP-8 SOCKETBJT transistor, NPN, TO-92
ICs 1
IC1TL071TL071BJT transistor, NPN, TO-92
Potentiometers 5
DRIVE100kAA100k16mm right-angle PCB mount pot
SUSTAIN100kBB100k16mm right-angle PCB mount pot
TONE100kBB100k16mm right-angle PCB mount pot
BIAS100kBB100k16mm right-angle PCB mount pot
VOLUME250kAA250k16mm right-angle PCB mount pot
Switches 2
TB-BUF4PDT slide4PDT SLIDESlide switch, 4PDTE-Switch EG4208 (4mm lever) or EG4208A (6mm lever)
FSW3PDT3PDTStomp switch, 3PDT
LEDs 1
LED5mm5MMLED, 5mm, red diffused
Jacks & sockets 3
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 mountMouser 163-4302-E or equivalent.
Hardware 1
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.