Akashic Guitar effects PCB lookup
BIAS

1590B · 1 knobs

Fuzz Dog· WhatFilt

What Filter? Fuzz

Based on the Fuzz Face / Hiwatt Filter Fuzz

Category
Fuzz· Newest
Controls
Bias
Difficulty
Easy
Price
£30.00
Tags
fuzz

From the vendor

Nice take on making a silicon Fuzz Face more versatile.

It has the basic FF topology and adds a pot at the input to limit the frequencies hitting the fuzz, tightening things up, or open it up for full range fun as per the original.

What makes it interesting is the filter function. The original has this as a footswitch, but we've made it a toggle to keep things neat in a 1590B. It's easy enough to wire up a footswitch offboard if you think it'll be more useful.

The second toggle - a three-way - selects what the filter does to the mids, accentuating the upper, middle or lower mids for pretty different resulting sonic sweetness. This is a rotary on the original, but we really try to avoid them where possible. You get the same three sounds on the toggle.

The kit is supplied with vertical-mount pots which have round shafts, so you'll need set-screw fitting knobs.

If you want the PCB without parts there's a link for that at the bottom of the page.

Partial kit: PCB, all board-mounted components, pots.

Full kit: As above, plus footswitch and appropriate daughterboard/components for your selected bypass type (see Downloads section for details of those), jack sockets, DC socket, battery snap, hook-up wire, LED.

Enclosure (pre-drilled) is available as an option with full kits, and will not take a battery. Knobs are not included.

Builds are only available with full kits including enclosures and vertical-mount pots. Please choose appropriate knobs.

Inspired by: Fuzz Face / Hiwatt Filter Fuzz

Difficulty: Easy

PCB size: 50 x 33mm

Knobs required: 4

Enclosure: 1590B

Direct-Connect compatible (4-way)

Download the INSTRUCTION PDF

Schematic

The schematic is in the vendor's build document, page 3. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 17 rows

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RefValueNormalizedTypeNotes
Resistors 4
R110M10M
R218K18k
R3120K120k
R41K51.5k
Capacitors 10
C110n10n
C2470p470p
C31n1n
C4100n100n
C510n10n
C656n56n
C722n22n
C81u1uElectrolytic capacitor
C922u22uElectrolytic capacitor
C10100u100uElectrolytic capacitor
Diodes 1
D11N58171N5817
Transistors 1
Q1-2BC109CBC109C
Potentiometers 1
BIAS50K Trimmer50K TRIMMER