OKKO Dominator

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.

OKKO Diablo - Modded Monster Pot Edition

Request.  A modded version of the Okko Diablo with pots replacing the onboard trimmers and scope for even more!  This will give you an 8 knob version of the Diablo with the Presence and Bass controls external.  If you're feeling particularly brave you could even replace the trimmers on the booster to make an 11 knob Okko Diablo Behemoth, but I'll leave that one up to you! :o)

Includes a switch which will supply the circuits with either 9V or 18V to give you even more versatility in the dynamics and headroom of the effect, and the main effect and boost have been done on separate boards so you can just make the main circuit if you want to, or maybe even add your favourite boost instead of this one.  The main board will fit in a 1590B and there's a prize for the first person to do it with all 7 main board pots! :o)

Tip: I have heard a recommendation that the 100R resistor from Q3 source can be replaced with a 1K trimmer to help bias things up, but again I'll leave that choice to you as to whether you add a trimmer or experiment with resistor values (800 ohms worked for the guy who suggested it).

Info about the original from Okko:

The Diablo is a versatile low to medium gain overdrive with an exceptionally dynamic response. It preserves the character of your instruments and is very sensitive to your playing technique. Thanks to the effective and musical controls, the Diablo works equally well with any kind of guitar, amp or playing style. People use it for so many different sounds, you would hardly believe that they use the same pedal.

Besides the usual Gain, Tone and Level knobs, the Diablo has some more interesting controls:

FEED affects the amount of bass in the input signal. You know the problem: an overdrive sound gets muddy rapidly if the input signal is too bass heavy (that’s why the treble booster was invented).  With the FEED control you can make even the fattest neck humbucker sound clear and transparent or beef up weak pickups a little.

The BODY control takes effect on mids and compression.  Another important feature is the HEADROOM SWITCH. Set to the "HI" position, an internal electronic voltage doubler is activated – the Diablo runs on 18 Volts from a regular 9 V battery or power supply.  The higher voltage gives more dynamic range, more headroom and tighter bass – just try it!

The Diablo comes in two versions: the regular one and the Diablo Gain+ with two footswitchable gain settings.