boom stick

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ControlsGAIN:Gainiscontrolledbyanmosfetboostatthefrontendofthecircuit.TONE:ABigMuffTM tonecontrolderivativeVOL:Theoutputlevel.SUB:Thisswitchletsyouchoosebetweentwodifferentsublevelstoallowsomecontrolovertheoverallbass.Whentheswitchison,itaddsa470ncapinparallelwiththeexisting47n.OD:ThisswitchshortsthesourcepinofQ3togroundforaddedgain.Build NotesThefilternetworkattheendofthecircuitisasecondorderlowpassfiltercenteredon7960Hz.Thisisobtainedbyapairof10k/2nnetworksinseries.C8andC9callfor2ncaps,howeverthesevaluesarehardertofind(theyareavailableasXiconMylarfilmcaps(greenies)).Youcanuse2n2asasubfor 2n, however, if you want to get approximately the same frequency response then use 9k1resistorsforR16&R17.Hereisachartusingdifferentcombinationsofresistor/capvalues.

Cap Resistor Freq(Hz)2n 10k 79612n2 9.1k 79531n8 11k 80421n5 13k 8165

Notethatyoucanuse9mmAlphapotsmounteddirectlytothePCB.Ifusingthese,IsuggestmountingC2last,asitwillbeatightfitandmayrequireyoutobenditsleadsaroundslightly.

TheBoomstickisthegainsideoftheKokboxprojectwithsomemodsaddedinforextraboostandtoneshaping.Ifyouarefamiliar withtheBSAIB2projectonGeneralGuitarGadgets,theBoomstickisverysimilarintopology.However,thesetwoeffectsdonotsoundalike.TheBoomstickiscomprisedofonedynamicandtwostaticmosfetstageswithaBigMuffTM typetonecontrol,aswellasasecondorderlowpassfilterattheend.ItcreatesaverythickdistortionsimilartoanoverdrivenMarshallJTM45.

http://www.madbeanpedals.compresents

boomstick

FX TYPE: DISTORTION PCBartworkm2011madbeanpedals

Releasedate:01.15.11

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Layout Diagram

ThisPCBwillfitina1590Benclosure2.05Wx1.0H

Bill of materials

R1 1M C1 100n D1 9.1vZenerR2 1M C2 22n D2 1n5817R3 5k1 C3 470pR4 1M C4 22n Q1Q3 BS170R5 470k C5 47nR6 1M C6 22n SUB SPST

R7 1M C7 100n ODSPDT(On/On)

R8 5k1 C8 2nR9 180R C9 2n GAIN 5kCR10 1M C10 470n TONE 100kBR11 1M C12 47uF VOL 100kAR12 5k1R13 330RR14 47kR15 82kR16 10kR17 10kR18 82R

Switches

Pots

Resistors Caps Diodes

Transistors

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BoomstickSchematic

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Wiring Diagram

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Single Sided layout

Boomstick ver.1.5(doesnotincludetheSuborODswitches)

2Wx1.55H(includingborders)

R1 1M C1 100nR2 1M C2 22nR3 5k1 C3 470pR4 1M C4 22nR5 470k C5 1uFR6 1M C6 22nR7 1M C7 100nR8 5k1 C8 2nR9 180R C9 2nR10 1M C10 47uFR11 1MR12 5k1 D1 9.1vZenerR13 330R D2 1n5817R14 47kR15 82k Q1Q3 BS170R16 10kR17 10k GAIN 5kCR18 4k7 TONE 100kBR19 82R VOL 100kA

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4.64Wx6.68H

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TermsofUse

ThemadbeanpedalseffectsprojectsandPCBproductsareavailablefornoncommercialusetoallDIYenthusiasts,hobbybuildersandpedalmakers.Theyarenotintended,norshouldtheybeused,forcommercialmanufacturing.ThismeansthatthePCBsandinformationintheprojectdocumentsshouldnotbeutilizedinthecontextofprofessionalpedalmaking.However,buildingtheprojectsforyourselforyourfriendsormakingtheoccasionaloneoffforsaleisentirelypermissible.ThesaleofPCBsorkitsusingtheincludedPCBartworkisstrictlyprohibited,however.

Pleasekeepinmindthatsomeofthemadbeanpedalsprojectsarebaseduponcurrentlymanufacturedpedals.UsingtheprojectsorPCBstomakecheapknockoffpedalclonesforsaleoneBayisnotonlynotcool,butpotentiallyhazardoustoyourkarma.Whilethevastmajorityofguitareffectscircuitsarenotpatented,manypedalmanufacturersdoholdtrademarksovertheirproducts.Anyattempttoinfringeonamanufacturerstrademarkcouldbemetwithlegalchallenges,andmadbeanpedalsoffersnowarrantyorguaranteeagainstthis,shouldyoudoso.

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