Enclosure not stated · 5 knobs

Revolution Deux L'Overdrive de la Revolution Deux (LORD)

Based on the Fred Briggs L'Overdrive de la Revolution Deux (LORD)

Category: Overdrive
Controls: Drive · Tone · Trim1 · Trim2 · Level
Price: see vendor
Also as: Vero layout · from Revolution Deux
Tags: freestompboxes.org trace

Read the post at Revolution Deux Schematic image Alternate schematic PCB layout PCB layout (copper)PCB layout (photo) Vero layout

From the vendor

The blog author's own overdrive, designed for the freestompboxes forum: a BS170 MOSFET gain stage, a passive tone control, then two cascaded J201 JFET stages that clip. The tone control sits between the MOSFET and JFET stages so it shapes the harmonics of the clipping stages, and a DPDT switch can bypass it for a large gain boost. The author describes it as somewhere between a Marshall and a Mesa, more open and touch sensitive at 12V or 18V.

C2 (MOSFET output cap) sets the bass response; values from 2.2n to 22n work. The author used 4.7n in his build with a 'voice' switch that adds another 4.7n in parallel (thin vs stock). C7 (10u on Q2's source): remove it for lower gain, or replace it with 100n for a 'presence' boost; the author used 100n in his build. C5 (1n on Q2's gate): increase for more high-end roll-off. C8 (470p): alter for more high-end roll-off; 220p to 1n work well. C10 (470n presence cap on Q3's source): change the value to alter the frequency response. Alternate tone stack (used in the author's build): 10n, two 10K resistors, a B50K pot, 82n and 1K. The PCB version by Marshmellow adds a Gain switch that lifts C7. Try running it at 9V, 12V and 18V; higher voltage gives a more open, less compressed tone.

Schematic

The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.

Parts list 32 rows

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Check before you build · 1 value the reader of this schematic was not sure of

D1's part number is not drawn; Torchy's vero parts list gives 1N4148 (or an LED).

Ref	Value	Normalized	Type	Notes
Resistors 12
R1	1M	1M		read from the schematic by eye
R2	1M	1M		read from the schematic by eye
R3	5.1K	5.1k		read from the schematic by eye
R4	47K	47k		read from the schematic by eye
R5	39K	39k		read from the schematic by eye
R6	39K	39k		read from the schematic by eye
R7	100K	100k		read from the schematic by eye
R8	1M	1M		read from the schematic by eye
R9	1.5K	1.5k		read from the schematic by eye
R10	1M	1M		read from the schematic by eye
R11	33K	33k		read from the schematic by eye
R12	390	390		read from the schematic by eye
Capacitors 10
C1	33n	33n		read from the schematic by eye
C2	10n	10n		2.2n-22n; author used 4.7n; read from the schematic by eye
C3	4.7n	4.7n		read from the schematic by eye
C4	15n	15n		read from the schematic by eye
C5	1n	1n		read from the schematic by eye
C7	10u	10u		electrolytic; read from the schematic by eye
C6	1n	1n		read from the schematic by eye
C8	470p	470p		read from the schematic by eye
C10	470n	470n		read from the schematic by eye
C9	47n	47n		read from the schematic by eye
Diodes 1
D1	1N4148	1N4148		not labeled on the schematic; from the vero parts list; read from the schematic by eye
Transistors 3
Q1	BS170	BS170		read from the schematic by eye
Q2	J201	J201		read from the schematic by eye
Q3	J201	J201		read from the schematic by eye
Potentiometers 5
Drive	5K	5k	Potentiometer	variable resistor on Q1's source; read from the schematic by eye
Tone	B100K	B100k	Potentiometer	read from the schematic by eye
Trim1	100K	100k	Potentiometer	trimmer, set for 4.6V on Q2's drain; read from the schematic by eye
Trim2	100K	100k	Potentiometer	trimmer, set for 6.4V on Q3's drain; read from the schematic by eye
Level	B100K	B100k	Potentiometer	read from the schematic by eye
Switches 1
Tone bypass	DPDT on-on	DPDT ON-ON		bypasses the tone section; read from the schematic by eye