FuzzDog Bionic GuzzFun User manual

Bionic GuzzFun

5 knobs of sonic mayhem

and an oscillation switch too

PedalParts.co.uk

Schematic

R1 910K

R2 180K

R3 910K

R4 910K

R5 10K

R6 180K

R7 4 7

R8 910K

R9 750R

C1 100n

C2 10n

C3 470p

C4 4.7u

C5 4.7u

C6 100n

C7 330n

S1-3 SPDT

Q1,2* 2N5089

Q3* 2N5306

DENS 100KB

FUZZ 10KB

FILT 10KB

BIAS 50KB

VOL 100KA

*The stock transistors give highly variable, very gated results, which may not

be to everyone’s taste. That’s all part of the charm of this box. However, if you

want to make it a bit more ‘normal’ you can try subbing some other stuff in

there. 2N5088 work well in Q1-2, and other medium gain NPN cans may offer

good results. A lower gain darlington for Q3 will tame things a bit. PSA13

worked well in reducing the gating, but the legs will need twisting. See later in

the doc for details.

The optional alternatives supplied with the kit are PSA06, which have the

same pinout as 2N5089, and BC517 which is different to the 2N5306 - see over.

Snap the little metal tags off the pots to mount them flush in the box.

You UST use some kind of heat sink on the legs of the transistors

when soldering. They aren’t keen on heat. Any more than 3-4

seconds of iron and they’re toast.

Pots mount on the same side as the components.

Give some thought to placement before soldering in your offboard

wires. Extra pads have been added to make it a doddle. Your 9V and

one GND should be on the same side as the components, as your

DC socket is on that side.

The others should all be on the back side of the board, which will place them very close to

the footswitch.

The two separate GND connections near VOL and BIAS

are for your jack sockets.

Non-standard pinout for Q3 is shown above.

2N5306 come in both ECB and EBC pinouts, so you’ll

need to check yours. If you’re subbing a different can then

you’ll need to check the pinout and twist the legs to fit.

BC517 have this pinout >>>>

Oscillation Switch - you can wire this offboard with any SPDT ON-ON toggle switch. You

can use a DPDT if you want to also wire in a LED to show whether it is engaged or not. You

can even wire it as a separate footswitch (see the Wiring section). Ignore the two holes

above S1-3 - they’re for the dinky board-mount switch which is an option.

OD!

If you want to get super-freaky you can replace R5 with a pot to control how much

oscillation you’ll get when engaged. Just connect pins 1 and 2 of a pot to the resistor pads.

10KB will work, but you may find smaller values and different tapers give a better useable

sweep. Experiment.

1 2 3

Test the board!

Once you’ve finished the circuit it makes sense to test is before

starting on the switch and LED wiring. It’ll cut down

troubleshooting time in the long run. If the circuit works at this

stage, but it doesn’t once you wire up the switch - guess what?

You’ve probably made a mistake with the switch.

Solder some nice, long lengths of wire to the board connections for

9V, G D, I and OUT. Connect I and OUT to the jacks as shown.

Connect all the G Ds together (twist them up and add a small

amount of solder to tack it). Connect the battery + lead to the 9V

wire, same method. Plug in. Go!

If it works, crack on and do your switch wiring. If not... aw man.

At least you know the problem is with the circuit. Find out why, get

it working, THE worry about the switch etc.

BATTERY

IN OUT

Your nice, new circuit board

INCLUDING WIRED POTS!!!!

IN 9V GND OUT

Wire it up - DC only version

There are G D connections for both jacks at either end of the board.

All the G D pads are connected to each other in the traces on the PCB,

and all of them are connected to both sides of the board.

For your convenience there is a G D pad for every required connection.

This circuit is standard, egative G D. Your power supply should be Tip

egative / Sleeve Positive. That’s the same as your standard pedals

(Boss etc), and you can safely daisy-chain your supply to this pedal.

BOARD

OUT

BOARD

GND

BOARD

GND

BOARD

GND

BOARD

INPUT

OUT

BOARD

GND

BOARD

LED+

Wire it up - with battery

There are G D connections for both jacks at either end of the board.

All the G D pads are connected to each other in the traces on the PCB,

and all of them are connected to both sides of the board.

For your convenience there is a G D pad for every required connection.

This circuit is standard, egative G D. Your power supply should be Tip

egative / Sleeve Positive. That’s the same as your standard pedals

(Boss etc), and you can safely daisy-chain your supply to this pedal.

Just because our pre-drilled

enclosure doesn’t

accommodate a battery, it

doesn’t mean you can’t add

one yourself in a bigger box.

Follow this!

BOARD

OUT

BOARD

GND

BOARD

GND

BOARD

GND

BOARD

INPUT

BATTERY

OUT

BOARD

GND

BOARD

LED+

Oscillation Switch

Maybe you want the oscillation mode on a footswitch...? Wire it as above

and your extra LED will light up when oscillation is engaged.

If you’re using DPDT (footswitch or toggle switch) just pretend that

middle row isn’t there.

You can use a footswitch daughterboard if you want to neatly mount the

LED for the oscillation. Connect the wires as below, but then flip the

PCB so the labels face down onto the footswitch so the LED pads are on

the correct side of the switch. You’ll also have to connect V to 9V and G

to ground to power the LED. Don’t forget the Current Limiting Resistor.

S3 GND

S3S1 S2

Drill template - 1590B

Please check positioning before drilling - those holes are your

responsibility and these templates are just a guide.

The best way to mark holes for the pots is to lay the PCB on the box

before you start soldering anything and mark at the centre pad of each.

The DC socket needs to be quite close to the edge of the box so it

comfortably clears the pots.

Recommended drill sizes:

Footswitch, DC 12mm

Jack sockets 9.5-10mm

Pots 7mm (8mm if you’re using the board-mount toggle)

Mini-toggle 5mm

Vertical distance from centre of pots to centre of toggle switch is 19mm.

Drill template - 1590BB

See previous page for notes on sizes etc.

Drill EITHER the second footswitch OR the mini toggle switch,

depending on which you’re using for the oscillation mode.

PedalParts.co.uk

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