Akashic Guitar effects circuit lookup
GAINLEVELTREBLEMIDSBASSMID RANGE

1590B · 6 knobs

Tagboard Effects

OKKO DominatorVerified

Based on the OKKO Dominator· 3 other boards clone it

Category
Distortion
Controls
Gain · Level · Treble · Mids · Bass · Mid Range
Build
Vero· 19×26· 38 cuts, 14 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Distortion, OKKO

From the post

Modded slightly to include a Mid Range pot instead of the switch in the original to give you complete variable control of the mids frequency rather than just 3 preset values.

I've done the charge pump on a separate board in an attempt to keep it 1590B friendly by allowing you to tuck the charge pump board out of the way somewhere, but with 6 pots I don't think too many people will want to do this anyway, so maybe some would prefer to simply add 5 rows to the bottom of the main board to keep it all integrated. It will fit into a 125B with those extra rows.

As with other layouts I have included a couple of axial caps simply because I have them in that size, but there's no problem using radial in there if that's what you've got.

Info about the original:

Aggressive british crunch, classic heavy metal, brutal modern high gain or anything in between – the Dominator easily does the job.

This box has nothing in common with those overcompressed, artificial sounding "bedroom metal" distortion pedals that disappear in the mix if you try to use them in a real band situation. Raw natural gain structure, explosive attack, tight low end and great chord definition make the difference – the Dominator works equally well at home practice or stage level.

The active 3-band EQ with switchable mid range frequency provides effective and intuitive control over a broad range of sounds. (For extensive descriptions of the controls please refer to the user manual).

Just like the other OKKO drive pedals, the Dominator features an internal voltage doubler. The three gain stages and the EQ stage operate on different individually filtered voltages up to 18 volts for optimal dynamic response and very low noise performance.

The Dominator works best in front of a clean amp with some headroom, especially if you use very bass heavy "chugga chugga" settings.

Schematic

This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.

Parts list 44 rows

Report a wrong parse

Got parts in a drawer? See what you can build with them.

Check before you build · 3 values the reader of this layout was not sure of
  • 51n at the right edge near Q2 / the 15V wire: printed clearly, unusual value
  • 2u2 at the far left (grey box with a polarity bar) and 10u left of Q2 (box with a minus bar): polarised parts drawn as boxes rather than round cans, type assumed electrolytic
  • 10K count (14): the board is dense and several 10K stand side by side around IC1 and IC2; one of them (left of the 15K, right of IC1) is partly hidden in the full view
RefValueNormalizedTypeNotes
Resistors 14
×1410K10kread from the layout by eye
×51M1Mread from the layout by eye
×31K1kread from the layout by eye
×3470K470kread from the layout by eye
×22K22.2kread from the layout by eye
×27K57.5kread from the layout by eye
×247K47kread from the layout by eye
×122K22kread from the layout by eye
×1100K100kread from the layout by eye
×115K15kread from the layout by eye
×139K39kread from the layout by eye
×1470R470read from the layout by eye
×1330R330read from the layout by eye
×151R51regulator board; read from the layout by eye
Capacitors 16
×422n22nread from the layout by eye
×4220n220nread from the layout by eye
×210n10nread from the layout by eye
×151n51nread from the layout by eye
×1100p100pread from the layout by eye
×1470p470pread from the layout by eye
×11n1nread from the layout by eye
×12n22.2nread from the layout by eye
×168n68nread from the layout by eye
×1100n100nread from the layout by eye
×1470n470nread from the layout by eye
×1680n680nread from the layout by eye
×12u22.2uelectrolytic, drawn as a box with polarity mark; read from the layout by eye
×410u10uelectrolytic; one on the main board drawn as a box, three on the regulator board printed 10U; read from the layout by eye
×222u22uelectrolytic; read from the layout by eye
×1220u220uelectrolytic, regulator board, printed 220U; read from the layout by eye
Diodes 1
×21N58171N5817regulator board; read from the layout by eye
Transistors 2
Q1BF245ABF245AJFET; read from the layout by eye
Q2BF245ABF245AJFET; read from the layout by eye
ICs 5
IC1OPA2604OPA2604read from the layout by eye
IC2TL072TL072read from the layout by eye
IC3TL072TL072read from the layout by eye
×1ICL7660SICL7660Sregulator board; read from the layout by eye
×178L1578L15regulator, on the regulator board; read from the layout by eye
Potentiometers 6
GainB100KB100kPotentiometerread from the layout by eye
LevelA100KA100kPotentiometerread from the layout by eye
TrebleB25KB25kPotentiometerread from the layout by eye
MidsB25KB25kPotentiometerread from the layout by eye
BassB10KB10kPotentiometerread from the layout by eye
Mid RangeB1MB1MPotentiometerread from the layout by eye

Other boards based on the OKKO Dominator