1

http://www.madbeanpedals.compresents

g gl li it tt te er rr ra at tt ti ii i

FX TYPE: OVERDRIVE BasedontheXoticBBPreamp

PCBartworkm2011madbeanpedalsReleasedate:04.03.11

Thecontrolsareasfollows

GAIN:Thetotalamountofoverdrive.BASS,TREBLE:Theseactivetonecontrolscancutorboostthebassandtreblefrequenciesoftheoverdrive.ThesetonecontrolsareonevariationoftheBaxandallactivetonestack.VOL:Thetotaloutput.

Notes

Therearemanydifferentopampsyoucanuseinthiscircuit.ForIC1,trythe4558,4580,TCL2272,JRC4557,LF353,OPA2604ortheOPA2134.IC2shouldbealownoiseampsuchastheTL072.

TomaketheGlitterrattimorebassfriendly,trythefollowing:increaseC1to220n,C10andC11to68nandC7,C12to10n.

2

Manufactured Version

2.05Wx1.65HThisversionwillfitina1590B.

R1 1M C1 22n D1,D2 1N41482R2 470k C2 1uF D3 1N4005R3 10k C3 51pfR4 10k C4 47n Q1,Q2 2N5088R5 10k C5 220nR6 4k7 C6 220n IC1 JRC4558R7 1k C7 4n7 IC2 TL072R8 10k C8 100nR9 1k C9 151pf GAIN 1MBR10 19k C10 33n BASS 50kBR11 1k C11 33n TREB 50kBR12 220R C12 4n7 VOL 100kBR15 10k C14 10uFR16 47k C15 100nR17 4k7 C16 10uFR18 4k7 C17 10uFR19 33k C18 10uFR20 10kR21 470kR22 10kR23 47RR24 100kR25 10kR26 10kR28 1k

ICs

Pots

Resistors Caps Diodes

Transistors

3

4

5

Single Sided Version for etching Note that the treble and gain pots are wired 123, and the bass and volume are 321 on this version. There are two jumpers on the pcb!

2.22Wx2.29H(includingborders)

ThisproductisintendedforDIYuseonly.Commercialuse,includingthesaleofPCBs,kitsorpedalsutilizingthisinformation,isstrictlyprohibited.