Akashic Guitar effects PCB lookup
BIAS

1590B · 1 knobs

Fuzz Dog· bbc

BBC Dumb

Based on the BBC-1 / JHS Fumble

Category
Boost
Controls
Bias
Difficulty
Easy
Price
£24.00
Tags
boost

From the vendor

Get yourself a little bit of that Dumble magic.

Here we have the BBC-1 - John Mayer's preamp buffer, recently replicated as the NotADumble clean channel.

Should work fine with any of the usual suspect FETs, but we care about you guys so have sourced the correct one, despite it being obsolete. Only available until we run out.

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 can take a battery if desired with footswitch positioned 22mm higher, closer to the controls. Knobs are not included.

Builds are only available with full kits including enclosure. Please choose appropriate knobs.

Inspired by: BBC-1 / JHS Fumble

Difficulty: Easy

PCB size: 50 x 25mm

Knobs required: 2

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 14 rows

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RefValueNormalizedTypeNotes
Resistors 5
R1100R100
R21M51.5M
R31M1M
R55K65.6k
R6100R100
Capacitors 6
C1100n100n
C2100p100p
C3100n100n
C4100u100uElectrolytic capacitor
C54u74.7uElectrolytic capacitor
C610u10uElectrolytic capacitor
Diodes 1
D11N58171N5817
Transistors 1
Q1J309*J309
Potentiometers 1
BIAS50K trimmer50K TRIMMER