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DRIVETONEVOLUME

Enclosure not stated · 3 knobs

Revolution Deux

Fulltone OCD V4 (Stratotrasto)

Based on the Fulltone OCD· 12 other boards clone it

Category
Overdrive
Controls
Drive · Tone · Volume
Price
see vendor
Also as
Vero layout · from Revolution Deux
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagePCB layoutOCD V1-V3 differences (PDF) Vero layout

From the vendor

Stratotrasto's schematic and PCB of the Fulltone OCD version 4, an amp-like overdrive with a TL082 gain stage, a pair of 2N7000 MOSFETs (and a 1N34 germanium diode) clipping to ground, a second op-amp gain stage and a passive tone with a high/low-pass switch. The post points out it is essentially a modified Voodoo Lab Overdrive.

Check that the pinout of your clipping MOSFETs matches the layout. The germanium diode (1N34) can be left out: it was on the V4 prototype but dropped from the newest models. The author's redesigned Super OCD is a further option.

Schematic

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

Parts list 34 rows

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Check before you build · 1 value the reader of this schematic was not sure of
  • The input cap is drawn 20n (the vero layout uses 22n).
RefValueNormalizedTypeNotes
Resistors 13
R11M1Mread from the schematic by eye
R210K10kread from the schematic by eye
R3470K470kread from the schematic by eye
R410K10kbias divider; read from the schematic by eye
R510K10kbias divider; read from the schematic by eye
R62.2K2.2kread from the schematic by eye
R718K18kread from the schematic by eye
R810K10kread from the schematic by eye
R910K10kread from the schematic by eye
R10150K150kread from the schematic by eye
R1139K39kread from the schematic by eye
R1222K22kread from the schematic by eye
R1333K33kread from the schematic by eye
Capacitors 12
C120n20nread from the schematic by eye
C210u10uelectrolytic; read from the schematic by eye
C310u10uelectrolytic; read from the schematic by eye
C4100u100uelectrolytic, supply; read from the schematic by eye
C5100n100nsupply; read from the schematic by eye
C668n68nread from the schematic by eye
C7220p220pread from the schematic by eye
C81n1nread from the schematic by eye
C9220p220pread from the schematic by eye
C10100n100nread from the schematic by eye
C111u1uelectrolytic; read from the schematic by eye
C1247n47nread from the schematic by eye
Diodes 2
D11N41481N4148supply protection; read from the schematic by eye
D21N341N34germanium, optional; read from the schematic by eye
Transistors 2
Q12N70002N7000clipping; read from the schematic by eye
Q22N70002N7000clipping; read from the schematic by eye
ICs 1
IC1TL082TL082read from the schematic by eye
Potentiometers 3
DriveA1MA1MPotentiometerread from the schematic by eye
ToneB10KB10kPotentiometerread from the schematic by eye
VolumeB500KB500kPotentiometerread from the schematic by eye
Switches 1
HP/LPSPDTSPDTread from the schematic by eye

Other boards based on the Fulltone OCD