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BASSGAINSATURATIONBOOSTTONEVOLUME

Enclosure not stated · 6 knobs

Revolution Deux

Fred Briggs Super OCD

Based on the Super OCD· 1 other board clones it

Category
Overdrive
Controls
Bass · Gain · Saturation · Boost · Tone · Volume
Price
see vendor
Also as
Vero layout · from Revolution Deux
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagefreestompboxes.org thread Vero layout

From the vendor

The author's expanded Fulltone OCD (itself based on the Voodoo Lab Overdrive): an OPA2134 gain stage into a pair of 2N7000/BS170 MOSFET clippers, then a second op-amp stage set up as a clean boost, a tone control and volume. It adds a pre-gain Bass control borrowed from Paul C's Timmy, a Saturation pot that raises the clipping headroom, the Boost control, and a switch between 9V and 18V from a MAX1044 doubler.

The 10K-15K resistor after the gain stage: choose the value that suits your gear. The tone cap can be anything from 22n to 68n; a larger value gives a darker tone. Low-voltage-drop diodes can replace the 1N4001s in the voltage doubler.

Schematic

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

Parts list 39 rows

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Check before you build · 2 values the reader of this schematic was not sure of
  • The vero layout (unverified, by beedotman) uses a 50K trimmer for Bass and a 100K trimmer for Saturation, where the schematic has a 50KB Bass pot and a 10KB Saturation pot.
  • The MAX1044's second (pump) capacitor is not clearly drawn; only the 10u reservoir caps are.
RefValueNormalizedTypeNotes
Resistors 12
R115K15kread from the schematic by eye
R2510K510kto Vr; read from the schematic by eye
R32.2K2.2kread from the schematic by eye
R415K15kread from the schematic by eye
R510K10k10K to 15K, to suit your gear; read from the schematic by eye
R610K10kread from the schematic by eye
R710K10kread from the schematic by eye
R810K10kread from the schematic by eye
R910K10kread from the schematic by eye
R10100100read from the schematic by eye
R1115K15kVr divider; read from the schematic by eye
R1215K15kVr divider; read from the schematic by eye
Capacitors 13
C122n22ninput; read from the schematic by eye
C21u1uelectrolytic, in series with Bass; read from the schematic by eye
C339n39nread from the schematic by eye
C4100p100pread from the schematic by eye
C51n1nread from the schematic by eye
C61u1uelectrolytic; read from the schematic by eye
C7100p100pread from the schematic by eye
C81u1uelectrolytic; read from the schematic by eye
C922n22n22n to 68n, larger is darker; read from the schematic by eye
C1047u47uelectrolytic; read from the schematic by eye
C1110u10uelectrolytic; read from the schematic by eye
C1247u47uelectrolytic; read from the schematic by eye
C1310u10uelectrolytic; read from the schematic by eye
Diodes 3
D11N40011N4001or a low-drop diode; read from the schematic by eye
D21N40011N4001or a low-drop diode; read from the schematic by eye
D31N40011N4001polarity protection; read from the schematic by eye
Transistors 2
Q1BS170BS170or 2N7000; read from the schematic by eye
Q2BS170BS170or 2N7000; read from the schematic by eye
ICs 2
IC1OPA2134OPA2134read from the schematic by eye
IC2MAX1044MAX1044voltage doubler; read from the schematic by eye
Potentiometers 6
BassB50KB50kPotentiometerread from the schematic by eye
GainB1MB1MPotentiometerread from the schematic by eye
SaturationB10KB10kPotentiometerread from the schematic by eye
BoostB100KB100kPotentiometerread from the schematic by eye
ToneB25KB25kPotentiometerread from the schematic by eye
VolumeB500KB500kPotentiometerread from the schematic by eye
Switches 1
VoltageSPDTSPDT9V or 18V; read from the schematic by eye

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