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BUILD NOTES

Filter and Blend knob rotation

The Filter and Blend controls were inadvertently reversed in the original run of the Binary. This was

fixed in version 1.1 which began shipping in January 2022.

If your PCB does not say "v1.1" in the upper right then you have the earlier reversed version. In this

version the blend knob goes from full effect at CCW to full clean at CW, and the filter control will act as

a treble cut as you turn it up rather than adding treble as in a normal tone control.

This has no impact on the sound of the unit, so it's fine to leave it as-is, but if you do want to correct

the rotations then it's a simple fix. All you have to do is reverse lugs 1 and 3 of both potentiometers—in

other words, connect lug 3 to pad 1 and lug 1 to pad 3. The middle lug is left as-is.

If you're using the recommended PCB-mount potentiometers, it's easiest to clip the two outer lugs at

the bend of the "L" shape and then solder wires that cross over the center pin. Keep the center pin in

place as an anchor so the pot has a rigid connection to the PCB.

R11 resistor

R11 is a 1M resistor from the input of IC2A to the bias voltage. Of the two Duality units that have been

traced, Revision 4-K does not have this resistor and Revision 7 does.

It's good design practice to include it, and will have no impact on the tone other than improving the

stability of IC2A if it's used, so it's recommended to use it in all cases.

Filter control midrange mod

Douglas from Darkglass shared a modification that can change the character of the Filter knob. By

default, it's a 5kHz shelving filter, but it can be turned into a 1kHz midrange boost/cut control by using

2.2n for C18 and soldering a 22n capacitor across lugs 1 and 3 of the filter control.

BINARY DUAL FUZZ