Big Fluff PieEveryone loves abig chunk of fluff

Contents of this document are ©2018 Pedal Parts Ltd.No reproduction permitted without the express writtenpermission of Pedal Parts Ltd. All rights reserved.

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Schematic

Some of the components shown are not in standard Big Fluff builds.

SW1, D3 and D6 are only used if you want altertive clipping selection. If youaren’t including this place a jumper in either spot shown in BLUE below.

SHIFT is only included if you’re using an alternative tone stack with mid shift.If you’re going for a standard 3-pot version include the jumper shown in RED.

The power and signal pads on the PCBconform to the FuzzDog Direct Connectionformat, so can be paired with theappropriate daughterboard for quick andeasy offboard wiring. Check the separatedaughterboard document for details.

Be very careful when soldering the diodesand transistors. They’re very sensitive toheat. You should use some kind of heatsink (crocodile clip or reverse actiontweezers) on each leg as you solder them.Keep exposure to heat to a minimum(under 2 seconds).

Snap the small metal tag off the pots sothey can be mounted flush in the box.

Positive (anode) legs of the electrolytic capgoes to the square pad.

C14 can be laid flat to the PCB as shownon the cover image. This will give moreclearance in your enclosure.

Negative (cathode) legs of the diodes go tothe square pads.

D7 is an optional polarity protection diode.If you want to include one, use a 1N4001 orany other 400X variant.

TWO SETS OF TONE PADS?Yes. Use the centralised pads above R25 for a3-pot build, and the ones off to the right ofthe PCB for a 4-pot build. There’s no needfor any jumpers in either situation. Both setsof pads are directly linked to each other.

THAT SCOOPED MID-RANGE- NO THANKS!The Big Fluff Pie has a distinctive scoopedmid-range. In most cases this can beflattened out if desired. For the versionslisted in the first BOM page, this can beachieved by changing R18 and R19 to 39K,and C10 to 10n.

MOJO?Many different transistors have been usedacross the history of the BFP, some of whichare long gone. All of the ‘stock’ Fluffs listedon the first BOM page are supplied with2N5088.

While these may not always be the vintage-correct parts, they have been found to be thebest commonly-available all-rounder in aBFP.

There are additional notes regardingindividual circuits later in the document.Please check them before starting yourbuild.

Not sure what to make?Check out Kit Rae’s page.Astounding work.

Notes

CLIPPING SELECTION SWITCHThere are two sets of pads to select extraclipping diodes if you want some variation inyour pedal. SW1 (vertical) is placed to sitneatly in the middle of your knobs on a 3-potbuild. SW2 (horizontal) works for a 4-potversion. The jumpers shown on the previouspage will bring diodes D4-5 into the mix. Ifyou prefer to use the larger spaces (D3-D6)for a single clipping configuration you canjumper the opposite pads.

To incorporate an alternative clipping sectionon the Q3 gain stage, select some suitablediodes for D3-D6. There are no rules. Googleis your friend. Socket and experiment.

Add a SPDT ON-ON toggle switch in SW1 orSW2 to select between the two sets ofclipping (D4-D5 / D3-D6).

If you want to get really freaky you can use aSPDT ON-OFF-ON switch which will removethe clipping from that gain stage altogether.There’ll be a big volume jump with the switchin the middle position though, so usecaution.

ALTERNATIVE TONE SECTIONWe’ve incorporated parts so you can easilymodify the tone stack and add a midscontrol. We’ve stuck to the simple eleganceof the AMZ Presence Control.

You can experiment with your own values,but these two set-ups offer some great tonalvariation. For more info take a look at thisvery informative page:

http://www.muzique.com/lab/tone3.htm

AMZ Control #1R18 3K3R19 39KC10 12n (10n will be fine)C11 10nSHIFT 25KBTONE 100KB

AMZ Control #2R18 3K3R19 470KC10 15nC11 1n5SHIFT 25KBTONE 250KA

Notes

Green Black Civil War 73#18 Violet NYCBOM 3rd (70s) Russian Russian Russian Triangle Ram Head Ram Head Reissue R1 39K 39K 39K 39K 33K 33K 33K 39KR2 100K 100K 100K 100K 100K 100K 100K 100KR3 470K 470K 470K 470K 470K 470K 470K 510KR4 100R 390R 390R 390R 150R 100R 100R 100RR5 15K 12K 12K 12K 15K 12K 12K 10KR7 1K 1K 1K 1K 1K 820R 560R 1K8R8 8K2 10K 10K 10K 8K2 7K5 8K2 10KR9 100K 100K 100K 100K 100K 100K 100K 100KR10 470K 470K 470K 470K 470K 470K 470K 470KR11 15K 12K 12K 12K 12K 12K 12K 10KR12 100R 390R 390R 390R 150R 100R 100R 390RR13 8K2 10K 10K 10K 8K2 7K5 8K2 10KR14 100R 390R 390R 390R 150R 100R 100R 390RR15 470K 470K 470K 470K 470K 470K 470K 470KR16 100K 100K 100K 100K 100K 100K 100K 100KR17 15K 12K 12K 12K 12K 12K 12K 10KR18 100K 22K 22K 22K 33K 33K 33K 22KR19 39K 20K 22K 20K 33K 33K 33K 22KR21 100K 100K 100K 100K 100K 100K 100K 100KR22 390K 470K 470K 470K 470K 470K 470K 470KR23 2K2 2K 2K7 2K7 2K7 3K3 2K7 2KR24 10K 10K 10K 10K 12K 12K 12K 10KR25 1M 1M 1M 1M 1M 1M 1M 1MC1 100n 100n 100n 100n 100n 100n 100n 1uC2 470p 470p 470p 560p 500p 470p 470p 470pC3 1u 100n 100n 100n 100n 100n 100n 1uC4 1u 100n 100n 100n 100n 150n 100n 1uC5 470p 470p 470p 560p 500p 470p 470p 470pC6 100n 47n 47n 47n 47n 47n 100n 1uC7 1u 100n 100n 100n 100n 100n 100n 1uC8 470p 470p 470p 560p 500p 470p 470p 470pC9 100n 47n 47n 47n 47n 100n 100n 1uC10 3n9 3n9 3n9 3n9 3n9 3n9 3n9 3n9C11 10n 10n 10n 10n 10n 10n 10n 10nC12 100n 100n 100n 100n 100n 100n 100n 1uC13 100n 100n 100n 100n 100n 100n 100n 1uC14 100u 100u 100u 100u 100u 100u 100u 100uQ1 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088Q2 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088Q3 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088Q4 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088 2N5088D1 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148D2 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148D3 empty empty empty empty empty empty empty emptyD4 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148D5 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148 1N4148D6 empty empty empty empty empty empty empty emptySUSTAIN 100KA 100KA 100KA 100KA 100KA 100KA 100KA 100KATONE 100KB 100KB 100KB 100KB 100KB 100KB 100KB 100KBVOLUME 100KA 100KA 100KA 100KA 100KA 100KA 100KA 100KASHIFT -------------------------Place jumper as shown on page 2-------------------------------

C1 1uC2 470pC3 1uC4 1uC5 470pC6 1uC7 100nC8 470pC9 1uC10 3n9C11 10nC12 100nC13 1uC14 100u

Q1 MPSA18Q2 MPSA18Q3 MPSA18Q4 MPSA18

D1 1N4148D2 1N4148D3 jumperD4 1N4148D5 1N4148D6 empty

SUSTAIN 100kATONE 100kBVOLUME 100kAMIDS Jumper

R1 39kR2 100KR3 470KR4 100RR5 15KR7 1KR8 8K2R9 100KR10 470KR11 15KR12 100RR13 8K2R14 100RR15 470KR16 100KR17 15KR18 22KR19 39KR21 100KR22 390KR23 2K2R24 10KR25 1M

V3 79#2 - J MascisBased on what is supposedly one of J Mascis’ favourite Fluffs.The original has true tone bypass, but why would you want that?

C1 100nC2 500pC3 100nC4 100nC5 500pC6 47nC7 100nC8 500pC9 47nC10 3n9C11 10nC12 100nC13 100nC14 100uQ1 2N5089Q2 2N5089Q3 2N5089Q4 2N5089

D1 1N4148D2 1N4148D3 emptyD4 1N4148D5 1N4148D6 empty

SUSTAIN 100kATONE 100kBVOLUME 100kAMIDS Jumper

R1 39kR2 100KR3 470KR4 390RR5 12KR7 1KR8 10KR9 100KR10 470KR11 12KR12 390RR13 10KR14 390RR15 470KR16 100KR17 12KR18 22KR19 20KR21 100KR22 470KR23 2K7R24 10KR25 1M

Tall Font Green RussianBass players’ favourite. The feedback caps in the originalare two 1nf in series, but that’s the same as 500pf.

C1 100nC2 470pC3 100nC4 100nC5 470pC6 emptyC7 100nC8 470pC9 47nC10 4n7C11 10nC12 100nC13 100nC14 100u

Q1 BC184Q2 BC184Q3 BC184Q4 BC184

D1 emptyD2 emptyD3 emptyD4 1N4148D5 1N4148D6 empty

SUSTAIN 100kATONE 100kAVOLUME 100kAMIDS Jumper

R1 33kR2 100KR3 470KR4 100RR5 15KR7 820RR8 8K2R9 100KR10 470KR11 10KR12 100RR13 8K2R14 100RR15 470KR16 100KR17 15KR18 33KR19 33KR21 100KR22 390KR23 2K7R24 10KR25 1M

Csnd Supa Tonebender‘73 UK interpretation. The first clipping stage is removed whichchanges the sound to a mix of Tonebender-meets-Fluff. Heavy!Transistor pinout is reversed so flip them. There was an extra capbetween the third gain stage and the tone section, but it’ll soundjust the same without it. If you want a 100% clone look elsewhere.

C10 4n7C11 10nC12 100nC13 jumper

TONE 100kB

R7 1KR18 39KR19 39KR21-24 empty

Q4 No transistor - jumper the base and collector pads as shown

Csnd Jumbo TonebenderBased on the Supa, but the final gain recovery stage was removed givingthis much less gain and output level than its older brother. It has heavyhints of BFP but has its own character. Great on bass. BOM as above butchanges as shown below.

C1 100nC2 470pC3 100nC4 100nC5 470pC6 100nC7 100nC8 470pC9 100nC10 6n8C11 6n8C12 100nC13 100nC14 100u

Q1 2N3904Q2 NPN GeQ3 NPN GeQ4 2N3904

D1 5mm red ledD2 5mm red ledD3 emptyD4 5mm red ledD5 5mm red ledD6 empty

SUSTAIN 50KATONE 100KBVOLUME 1MAMIDS 20KB

R1 39KR2 100KR3 470KR4 100RR5 15KR7 2K2R8 8K2R9 100KR10 470KR11 15KR12 100RR13 8K2R14 100RR15 470KR16 100KR17 15KR18 2K2R19 39KR21 100KR22 390KR23 2K2R24 10KR25 1M

HooowwfNice example of slight modifications to a BFP making a BIG difference to thetone. The germanium cans and LED clipping make this a crunchier, grittierexperience - worth checking out even if you already have a BFP. Experimentwith NPN Ge cans in Q3-4. Original used 2N1308 - try AC176, AC127.

C1 1uC2 470pC3 47nC4 1uC5 470pC6 1uC7 1uC8 470pC9 1uC10 4n7C11 10nC12 100nC13 100nC14 100u

Q1 2N5089Q2 2N5089Q3 2N5089Q4 2N5089

D1 1N4148D2 1N4148D3 emptyD4 1N4148D5 1N4148D6 empty

SUSTAIN 100kBTONE 100kAVOLUME 100kAMIDS Jumper

R1 39kR2 100KR3 470KR4 JumperR5 15KR7 1KR8 8K2R9 100KR10 470KR11 15KR12 JumperR13 8K2R14 JumperR15 470KR16 100KR17 15KR18 47KR19 47KR21 100KR22 390KR23 2K2R24 10K

Creamy Dreamer

B&M Champion Fuzz UnitAnother vintage British interpretation, pretty much identical tothe Jumbo Tonebender. BC184C may be hard to come by, so tryothers. Looking for around 600hFE in Q1 and Q2, 150hFE in Q3.

C1 100nC2 560pC3 100nC4 100nC5 560pC6 1uC7 100nC8 560pC9 1uC10 4n7C11 10nC12 100nC13 100nC14 100uC15 emptyC16 jumper

Q1-4 BC549C*

D1-2 1N4148D3 emptyD4-5 1N4148D6 empty

SUSTAIN 100KATONE 100KBVOLUME 100KAMIDS Jumper

R1 33KR2 100KR3 470KR4 470RR5 10KR7 1KR8 10KR9 100KR10 470KR11 10KR12 150RR13 10KR14 150RR15 470KR16 100KR17 10KR18 33KR19 33KR21 100KR22 470KR23 2K7R24 10KR25 1M

Stoned ClericStoner heaven, based closely around a Ram’s Head 74#1 but with differentcans and a different emitter resistor in the first gain stage. Awesome stuff.

*BC549C pinout is the opposite to that shown on the PCB, so flip them.

C1 100nC2 470pC3 100nC4 100nC5 470pC6 emptyC7 100nC8 470pC9 100nC10 3n3C11 10nC12 100nC13 jumperC14 100u

Q1 BC184CQ2 BC184CQ3 BC184CQ4 No transistor - jumper Base & Coll.

D1 emptyD2 emptyD3 emptyD4 1N4148D5 1N4148D6 empty

SUSTAIN 100kBTONE 100kAVOLUME 100kAMIDS Jumper

R1 39kR2 100KR3 470KR4 100RR5 10KR7 1KR8 10KR9 100KR10 470KR11 10KR12 100RR13 10KR14 100RR15 470KR16 100KR17 15KR18 39KR19 39KR21-24 empty

Test the board!

UNDER NO CIRCUMSTANCES will troubleshooting helpbe offered if you have skipped this stage. No exceptions.

Once you’ve finished the circuit it makes sense to test is before starting on the switch andLED wiring. It’ll cut down troubleshooting time in the long run. If the circuit works at thisstage, but it doesn’t once you wire up the switch - guess what? You’ve probably made amistake with the switch.

Solder some nice, long lengths of wire to the board connections for 9V, GND, IN and OUT.Connect IN and OUT to the jacks as shown. Connect all the GNDs together (twist them upand 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 theproblem is with the circuit. Find out why, get it working, THEN worry about the switch etc.

BATTERY

IN OUTYour nice, new circuit boardINCLUDING WIRED POTS!!!!

IN 9V GND OUT

Wiring shown above will disconnect the battery when you remove the jack plugfrom the input, and also when a DC plug is inserted.

The Board GND connections don’t all have to directly attach to the board. Youcan run a couple of wires from the DC connector, one to the board, another tothe IN jack, then daisy chain that over to the OUT jack.

It doesn’t matter how they all connect, as long as they do.

This circuit is standard, Negative GND. Your power supply should be TipNegative / Sleeve Positive. That’s the same as your standard pedals (Boss etc),and you can safely daisy-chain your supply to this pedal.

LED

BOARDOUT

BOARD9V

BOARDGND

BOARDGND

BOARDGND

BOARDINPUT

BATTERY

+IN

OUTLED

BOARDGND

BOARDLED+

+

Wire it up (if using a daughterboard please refer to the relevant document)

This template is a rough guide only. You should ensure correct marking of yourenclosure before drilling. You use this template at your own risk.Pedal Parts Ltd can accept no responsibility for incorrect drilling of enclosures.

Drilling templateHammond 1590B

60 x 111 x 31mm

Recommended drill sizes:

Pots 7mm Jacks 10mm Footswitch 12mm DC Socket 12mm

32mm

21mm

This template is a rough guide only. You should ensure correct marking of yourenclosure before drilling. You use this template at your own risk.Pedal Parts Ltd can accept no responsibility for incorrect drilling of enclosures.

FuzzDog.co.uk

Drilling templateHammond 1590B

60 x 111 x 31mm

Recommended drill sizes:

Pots 7mm Jacks 10mm Footswitch 12mm DC Socket 12mm

32mm

27mm