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GAINLEVELTREBLEMIDBASS

Enclosure not stated · 5 knobs

Revolution Deux

OKKO Dominator

Based on the OKKO Dominator· 3 other boards clone it

Category
Distortion
Controls
Gain · Level · Treble · Mid · Bass
Price
see vendor
Tags
freestompboxes.org trace
Read the post at Revolution Deux Schematic imagefreestompboxes.org threadSabrotone vero layoutMundry PCB layout files

From the vendor

A German high-gain distortion in the same league as the Wampler Triple Wreck. Two BF245A JFET stages feed a pair of cascaded op amp gain stages that run from a doubled, regulated supply (ICL7660S charge pump and 78L15) and do the clipping themselves, followed by an active three-band EQ whose mid frequency is set by a three-position Mid Range switch. The post notes it is an op amp clipper running at a higher voltage than usual.

Schematic

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

Parts list 85 rows

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Check before you build · 4 values the reader of this schematic was not sure of
  • C6 is marked '100?' on the drawing (probably 100p).
  • D3's type is not given.
  • The drawing reuses designators: C22 is both the 22u bias filter and the 1n across OP2.2, R16 is both a 10k bias resistor and a 10k in the tone filter, and R17 is both a 10k bias resistor and a 47k. They are listed here with a and b suffixes.
  • C10 is marked only '470' (probably 470p).
RefValueNormalizedTypeNotes
Resistors 41
R11M1Mread from the schematic by eye
R21M1Mread from the schematic by eye
R310K10kread from the schematic by eye
R410K10kread from the schematic by eye
R510K10kread from the schematic by eye
R6470K470kread from the schematic by eye
R7470K470kread from the schematic by eye
R810K10kread from the schematic by eye
R92.2K2.2kread from the schematic by eye
R1022K22kread from the schematic by eye
R11100K100kread from the schematic by eye
R127.5K7.5kread from the schematic by eye
R131K1kread from the schematic by eye
R1415K15kread from the schematic by eye
R151M1Mread from the schematic by eye
R16a10K10ktone filter; drawn R16 (duplicate); read from the schematic by eye
R16b10K10kbias divider from +16V; drawn R16 (duplicate); read from the schematic by eye
R17a47K47ktone filter; drawn R17 (duplicate); read from the schematic by eye
R17b10K10kbias divider; drawn R17 (duplicate); read from the schematic by eye
R1847K47kread from the schematic by eye
R1947K47kread from the schematic by eye
R2039K39kread from the schematic by eye
R211K1kread from the schematic by eye
R221M1Mread from the schematic by eye
R232.2K2.2kread from the schematic by eye
R247.5K7.5kread from the schematic by eye
R25470470read from the schematic by eye
R2610K10kMid Range switch; read from the schematic by eye
R271M1MMid Range switch; read from the schematic by eye
R28240K240kMid Range switch; read from the schematic by eye
R2910K10kread from the schematic by eye
R301K1kread from the schematic by eye
R31330330read from the schematic by eye
R32470K470kread from the schematic by eye
R331M1Mread from the schematic by eye
R3410K10kread from the schematic by eye
R3510K10kLED resistor; read from the schematic by eye
R3610K10kread from the schematic by eye
R3710K10kread from the schematic by eye
R385151power filter; read from the schematic by eye
R3910K10kread from the schematic by eye
Capacitors 27
C122n22nread from the schematic by eye
C22.2u2.2uelectrolytic; read from the schematic by eye
C36.8n6.8nread from the schematic by eye
C410u10uelectrolytic; read from the schematic by eye
C5220n220nread from the schematic by eye
C6100p100pdrawn '100?'; read from the schematic by eye
C7220n220nread from the schematic by eye
C822u22uelectrolytic; read from the schematic by eye
C9100n100nread from the schematic by eye
C10470p470pdrawn '470'; read from the schematic by eye
C11220n220nread from the schematic by eye
C1251n51nread from the schematic by eye
C132.2n2.2nread from the schematic by eye
C1410n10nread from the schematic by eye
C15470n470nread from the schematic by eye
C1622n22nread from the schematic by eye
C1722n22nread from the schematic by eye
C1822n22nread from the schematic by eye
C19220n220nread from the schematic by eye
C2068n68nread from the schematic by eye
C21680n680nread from the schematic by eye
C22a22u22uelectrolytic, bias filter; drawn C22 (duplicate); read from the schematic by eye
C22b1n1nOP2.2 feedback; drawn C22 (duplicate); read from the schematic by eye
C2410u10uelectrolytic; read from the schematic by eye
C25220u220uelectrolytic, 25V; read from the schematic by eye
C2610u10uelectrolytic; read from the schematic by eye
C2710u10uelectrolytic; read from the schematic by eye
Diodes 3
D11N40041N4004voltage doubler; read from the schematic by eye
D21N40041N4004voltage doubler; read from the schematic by eye
D3??type not drawn; read from the schematic by eye
Transistors 2
Q1BF245ABF245Aread from the schematic by eye
Q2BF245ABF245Aread from the schematic by eye
ICs 5
OP1OPA2604APOPA2604APTLC2262 noted as an alternative; read from the schematic by eye
OP2TL072TL072read from the schematic by eye
OP3TL072TL072read from the schematic by eye
S1ICL7660SICL7660Scharge pump; read from the schematic by eye
S278L1578L15regulator; read from the schematic by eye
Potentiometers 5
GainB100KB100kPotentiometerread from the schematic by eye
LevelA100KA100kPotentiometerread from the schematic by eye
TrebleB25KB25kPotentiometerread from the schematic by eye
MidB25KB25kPotentiometerread from the schematic by eye
BassB10KB10kPotentiometerread from the schematic by eye
Switches 1
Mid Range3-position3-POSITIONselects R26, R27 or R28; read from the schematic by eye
LEDs 1
LEDLEDLEDstatus; read from the schematic by eye

Other boards based on the OKKO Dominator