1590B · 5 knobs

ROG Azabache

Based on the Run Off Groove Azabache· 3 other boards clone it

Category: Overdrive
Controls: Gain · Tone · Vol · Scoop · Bright
Price: €8.66in stock

Buy the PCB at TH Custom Effects Build document1.1

From the vendor

Run Off Groove's take on a Fender-flavoured overdrive, built around three cascaded JFET amplification stages emulating tube-amp non-linearity. Features a five-control front panel (Gain, Tone, Volume, Scoop, Bright) and four trimmer-set bias points for surgical voicing. The Azabache is the Run Off Groove team's special take on a Fender-style overdrive — built not with op-amps and clipping diodes alone, but with a chain of JFETs that approximate the large-signal behaviour of a small Fender tube amp. The result is a warm, dynamic distortion that responds to picking attack the way a tube circuit does — quiet playing stays clean, hard playing breaks into harmonic-rich saturation, and rolling

Schematic

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

Parts list 67 rows

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Ref	Value	Normalized	Notes
Resistors 26
R1	68 Ω	68	Power-rail decoupling.
R4	470 Ω	470	Q1 source self-bias.
R12	1.5kΩ	1.5k	J201 source resistors (Q2/Q3/Q4).
R15	1.5kΩ	1.5k	J201 source resistors (Q2/Q3/Q4).
R18	1.5kΩ	1.5k	J201 source resistors (Q2/Q3/Q4).
R11	2.2kΩ	2.2k	Gain-pot ground end.
R22	3.3kΩ	3.3k	Q5 emitter resistor.
R23	10kΩ	10k	Post-amp filter network.
R24	10kΩ	10k	Post-amp filter network.
R25	10kΩ	10k	Post-amp filter network.
R6	22kΩ	22k	Tone-stack series resistors.
R7	22kΩ	22k	Tone-stack series resistors.
R3	33kΩ	33k	Input series resistor.
R21	39kΩ	39k	Q5 base series resistor.
R5	47kΩ	47k	Tone branch / Q5 input.
R20	47kΩ	47k	Tone branch / Q5 input.
R10	100kΩ	100k	JFET stage gate-leak / Q5 collector load.
R14	100kΩ	100k	JFET stage gate-leak / Q5 collector load.
R17	100kΩ	100k	JFET stage gate-leak / Q5 collector load.
R19	100kΩ	100k	JFET stage gate-leak / Q5 collector load.
R2	1MΩ	1M	Pulldowns and bias references.
R8	1MΩ	1M	Pulldowns and bias references.
R9	1MΩ	1M	Pulldowns and bias references.
R13	1MΩ	1M	Pulldowns and bias references.
R16	1MΩ	1M	Pulldowns and bias references.
R26	1MΩ	1M	Pulldowns and bias references.
Capacitors 18
C2	150 pF	150p	Compensation caps at each stage gate.
C9	150 pF	150p	Compensation caps at each stage gate.
C11	150 pF	150p	Compensation caps at each stage gate.
C13	150 pF	150p	Compensation caps at each stage gate.
C15	470 pF	470p	Q5 input low-pass.
C14	1 nF	1n	Q5 input network.
C5	10 nF	10n	Tone-stack capacitors.
C6	10 nF	10n	Tone-stack capacitors.
C7	22 nF	22n	SCOOP coupling / output presence.
C18	22 nF	22n	SCOOP coupling / output presence.
C17	68 nF	68n	Post-amp shelf cap.
C3	220 nF	220n	Inter-stage DC-blocks.
C4	220 nF	220n	Inter-stage DC-blocks.
C8	220 nF	220n	Inter-stage DC-blocks.
C10	220 nF	220n	Inter-stage DC-blocks.
C12	220 nF	220n	Inter-stage DC-blocks.
C16	220 nF	220n	Inter-stage DC-blocks.
C1	220 µF	220u	Bulk +9V decoupling. 16 V or higher rated.
Diodes 7
D1	1N4001	1N4001	Reverse-polarity protection.
D4	1N4148	1N4148	Inter-stage clipping diodes — three pairs, anti-parallel. 1N914 equivalent
D5	1N4148	1N4148	Inter-stage clipping diodes — three pairs, anti-parallel. 1N914 equivalent
D6	1N4148	1N4148	Inter-stage clipping diodes — three pairs, anti-parallel. 1N914 equivalent
D7	1N4148	1N4148	Inter-stage clipping diodes — three pairs, anti-parallel. 1N914 equivalent
D8	1N4148	1N4148	Inter-stage clipping diodes — three pairs, anti-parallel. 1N914 equivalent
D9	1N4148	1N4148	Inter-stage clipping diodes — three pairs, anti-parallel. 1N914 equivalent
Transistors 5
Q1	2N5457	2N5457	Input JFET. TO-92 through-hole. SOT-23 BC548 footprint also available
Q2	J201	J201	Cascaded gain-stage JFETs. TO-92 through-hole. SOT-23 alternates Q2A/Q3A/Q4A on V1.2 board for SMD parts.
Q3	J201	J201	Cascaded gain-stage JFETs. TO-92 through-hole. SOT-23 alternates Q2A/Q3A/Q4A on V1.2 board for SMD parts.
Q4	J201	J201	Cascaded gain-stage JFETs. TO-92 through-hole. SOT-23 alternates Q2A/Q3A/Q4A on V1.2 board for SMD parts.
Q5	2N5088	2N5088	Recovery stage NPN BJT. TO-92.
Potentiometers 3
GAIN	A100k	A100k	Audio (logarithmic) taper.
TONE	B100k	B100k	Linear taper for tone-stack symmetry.
VOL	A50k	A50k	Audio (logarithmic) taper.
Trimmers 4
TRIM1	10kΩ	10k	Q1 (2N5457) drain bias.
TRIM2	25kΩ	25k	Q2/Q3/Q4 (J201) drain bias.
TRIM3	25kΩ	25k	Q2/Q3/Q4 (J201) drain bias.
TRIM4	25kΩ	25k	Q2/Q3/Q4 (J201) drain bias.
Switches 2
Scoop	SPST	SPST	Mid-scoop on/off toggle (PCB-mount or panel-mount slide).
Bright	SPST	SPST	Bright cap on/off toggle.
LEDs 2
D2	LED 3 mm red	LED 3 MM RED	Input soft-clip diodes — anti-parallel from Q1 gate to ground.
D3	LED 3 mm red	LED 3 MM RED	Input soft-clip diodes — anti-parallel from Q1 gate to ground.

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