Akashic Guitar effects PCB lookup
ATTACKFEEDTONEVOLBIAS

1590B · 5 knobs

Fuzz Dog· necro

Necropolis

Based on the Boneyard

Category
Fuzz
Controls
Attack · Feed · Tone · Vol · Bias
Difficulty
Medium
Price
£51.60
Tags
fuzz

From the vendor

Is there anything better on a board than a Tone Bender? But which one to go for? They all have their merits and sound different enough to warrant several spots on the floor.

Enter the Necropolis - your handy multi-Bender.

Fuelled by three NPN germanium cans (or silicon if you want - totally up to you), so it works on your standard polarity supply without any faff.

Standard Vol and Attack controls are joined by a Tone pot - shades of the Mk III. Add in the Feed control, which drops the voltage as you wind it back, and you have a multitude of sounds to pick from.

Now, the switches. The lower is Tone Bypass, if you want to keep things pure. This was a footswitch on the original, but what's that about? Feel free to wire it offboard if you think that's useful on the fly.

...and the magic - the circuit switch in the middle. This takes the first stage transistor out of the mix, giving you a two-can Mk 1 and Mk 1.5 to play with. That's where the Feed pot comes into it's own.

We're offering the kit without the transistor sets, since you may have something tucked away for a special build. We'll show stock including sets until our bins are dry.

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 only available with full kits, and will not take a battery. Knobs are not included.

Inspired by: Boneyard

Difficulty: Medium

PCB size: 50 x 50mm

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 39 rows

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RefValueNormalizedTypeNotes
Resistors 15
R1910R910
R210M10M
R3100K100k
R4100K100k
R57K57.5k
R6470K470k
R7100K100k
R810K10k
R9470R470
R108K28.2k
R1118K18k
R123K93.9k
R133K33.3k
R146K86.8k
R151K1k
Capacitors 13
C11n1n
C210u10uElectrolytic capacitor
C34u74.7uElectrolytic capacitor
C44u74.7uElectrolytic capacitor
C54u74.7uElectrolytic capacitor
C610u10uElectrolytic capacitor
C7100u100uElectrolytic capacitor
C8100u100uElectrolytic capacitor
C9100u100uElectrolytic capacitor
C10100n100n
C1147n47n
C122u22.2u
C132u22.2u
Diodes 2
D11N41481N4148
D21N58171N5817
Transistors 4
Q1NPN Ge <>70hFE*NPN GE <>70HFE
Q2NPN Ge <>120hFE*NPN GE <>120HFE
Q3NPN Ge <>50hFE*NPN GE <>50HFE
Q4BC549CBC549C
Potentiometers 5
ATTACK1KCC1k
FEED50KBB50k
TONE10KBB10k
VOL10KAA10k
BIAS100K trimmer100K TRIMMER