Current lover 11.2011madbeanpedals

PCBDimensions:2.3Wx3.15H

R1 5k6 R24 10k C1 39n D1 1n914R2 1M R25 47k C2 47n D2 1N4007R3 5k6 R26 27k C3 1n D3 1N4001R4 1M R27 15k C4 100n D4 1n914R5 470R R28 33k C5 10uF D5 8.2vZenerR6 4k7 R29 10k C6 10uFR7 100k R30 62k C7 680pF Q1 2N3904R8 5k6 R31 1M2 C8 68n Q2 2N5087R9 100k R32 3k9 C9 220n Q3 2N5088R10 4k7 R33 10R C10 47nR11 4k7 R34 200k C11 47n IC1 JRC4558R12 82k R35 200k C12 3n3 IC2 ***R13 47k R36 1k C13 2n2 IC3 CD4049UBER14 10k R37 470k C14 33uF IC4 CD4013BCNR15 8k2 R38 100k C15 33uF IC5 LM324NR16 13k R39 10k C16 1uF IC6 LM311R17 470R R40 3k C17 1uFR18 470R R41 10R C18 22pF FILTER DPDTR19 39k R42 100R C20 100uFR20 24k C21 10uF CLOCK 100kR21 8k2 C22 100n BIAS 100kR22 30k C23 100n T1 10kR23 3k9 C24 47uF

FDBK 10kBRANGE 100kBRATE 1MCVOL 100kA

Pots

***IC2canbeMN3207orMN3007

Transistors

ICs

Switch

Trimmers

Resistors Resistors Caps Diodes

WhatIsIt?

TheCurrentLoverisanadaptationoftheElectroHarmonixElectricMistressflangerfor9voperationandavarietyofBBDchips. Itoffersverywarmandrichflangingwhilemaintaininglownoiseoperationandflexibilityinitscontrols.AdditionstothevintageMistressdesignareincluded.TheseareabufferedclocksignaltotheBBD,anFXloopforthroughzeroflangingandanoutputgainstagetomatchorexceedthebypassvolume.

MuchofthedevelopmentoftheCurrentLoverwasbasedontheworkbypresentedbyThomeequeonDIYstompboxesandthereforemuchgratitudeisowedtohimformakingitavailable.Thankyou!WhilethereisnosinglesidedartworkavailablefortheCurrentLover,ifyouwishtoetchyourownElectricMistressboard,pleasecheckouthisthreadsonDIYSB.

Controls

RateControlsthespeedoftheLFOwhichdrivestheflangereffect.RangeControlstheoveralldepthoftheflangingeffect.FeedbackThisistheamountdelaylinesignalsentbacktotheinputoftheBBD.Higherlevelsoffeedbackincreasethecomplexityoftheflangedsignalandcanyieldsomeintense,airplaneflanging.VolumeThisistheoutputvolumeoftheaddedgainstageattheendoftheeffect.Itallowsyoutomatchorexceedthebypasssignal.FilterThisDPDTswitchdisconnectstheLFOforamildtomoderateringmodulatoreffect.ThiseffectcanbeinfluencedwiththeRangeandFeedbackcontrols.

Notes

TherearethreepossibleBBDchoicesinbuildingtheCurrentLover.ThesearetheMN3007,theMN3207andthev3207.TheMN3007isstillavailablealthoughitisfairlyexpensive($8$12forasinglechip).Forthisreason,theCurrentLoverwasdesignedforalternativeBBDswhicharemorereadilyavailableandlessexpensive.TheMN3207issimilartotheMN3007buthaslowercurrentconsumptionanddifferentsupplyvoltagerequirements.Thev3207isapinforpincloneoftheMN3207andismanufacturedbyCoolaudio.PrototypeswerebuiltusingtheMN3007andMN3207.Whilethev3207wasnottesteditshouldworkfollowingthesamebuildingprocedureoutlinedbelowfortheMN3207.ThevideodemolinkedbelowwasbuiltusingtheMN3207fromsmallbear,whichwasabout$5.

BewaryofpurchasingMN3007chipsonline.TherearesomeoverseasellersoneBayofferingfakeorcounterfeitchips.ItisbesttopurchasetheMN3007orMN3207fromareliablesourcelikesmallbear,orotherDIYers,ifpossible.

TheCurrentLoverallowsyoutousePCBmounted16mmpotsandDPDTswitchforaneasierbuild.ThepadsfortheDPDTaresizedforlugsinsteadofpinssincetheyareverycommon.

Thereareseverallabeledgroundconnections(GND)ontheboard.Youdonotneedtouseallofthem:theyarethereforconvenience.

TwoSND/RTNpadsareincludedifyouwishtoexperimentwithathroughzerotypeflangingeffect.Ifyoudonotwishtousethisfeature,youwillneedtojumperthetwopadstogetherforcorrectoperation.Notethatthisdocumentdoesnotincludeanyinformationongeneratingthroughzeroeffectsasthatwasnotpartofthedevelopmentprocess.Itisofferedforthosewhowishtoexperiment.YoucanfindsomeinfoaboutTZwiththeElectricMistressonDIYSB.

Thisisacomplicatedandchallengingbuild.Takeyourtime!

Links

VideodemoofthemadbeanpedalsCurrentLoverbuild:http://www.youtube.com/watch?v=_CLKc7_c5eE

MN3007vs.MN3207(v3207)

JumpersThereareafewstepstotakedependingonwhetheryouarebuildingtheMN3007orMN3207version(assumethatthev3207isthesameasMN3207).Thepowerandgroundpinsonthesetwochipsaretheoppositeofoneanother,whichalsoinfluenceshowsomeadditionalcomponentsconnecttotheBBDs.Toallowforthedifferentchips,twojumpersarelocatedonthePCBtosetwhichpinsgetthepowerandwhichpinsgetground.

ConnectthehighlightedjumpersasshownbelowforyourBBDversion.

PowerTheMN3007andMN3207haveslightlydifferentpowerrequirements.TheMN3007canoperateforupto15vDC.TheMN3207supplyvoltageneedstobeclampedataround8v.

MN3007OmitD4,D5andC5.ConnectthesquareandroundpinsofC5togetherviaajumper.Thisdoestwothings:connectspin1oftheMN3007toVCviaa100Rseriesresistorfor(nearly) fullvoltageoperationandconnectstheVGGpinofthechiptoground.NotethatwhiletheCurrentLoverisintendedfor9voperation,youcansafelyoperateitupto15vDCprovideditiswellregulated.Ifyouchangetoalargersupplyafterbiasingitfor9v,youwillmostlikelyhavetorebiastheeffectforthelargersupplyvoltage.

MN3207ConnectD5,andC5asperthelayoutdiagram.Thislimitsthesupplyvoltageto8.2v.D4shouldlimitthe8.2vBBDsupplytoabout14/15forconnectingtotheVGGpin.However,thereisasmallerrorhereinthatD4isactuallyconnectingfromVContheboardandnotthe8.2v(VDD)supply.Howeverthisisaveryeasyfix.Simplyconnectthebottomlead(anode)ofD4totheC6/D5junction.Thiscanbedoneonthebottomsideoftheboardtokeepthingslookingclean.ThisisthesolutionIrecommend.Oncetheboardispowered,youshouldhavebetween7.6and7.7vDConpin4ofIC2.

Biasing

ThefinalstepaftersolderingallthecomponentsandjumpersistoproperlybiastheoperationoftheclockandBBD.Thisisactuallyveryeasyandcanbedonebyear.

Beforepoweringuptheboardandconnectingyourguitarandamp,settheClockandBiastrimmerstotheirmiddleposition.SettheT1trimmerandRatepotfullycounterclockwise.Finally,settheRange,VolumeandFeedbackpotstoapproximatelytheirmiddlepositionsandtheFilterswitchtotheupposition.Nowconnecttheboardbetweenyourguitarandampandpoweritup.Youshouldgetsignalthroughtheeffect,althoughyoumaynothearanyflangingyet.Ifyoudonothaveanysignal,doublecheckyourconnectionsandensurethattherearenobugsinyourbuild.

FirstadjusttheBiastrimpotuntilyougetsomeflanging.Youdonthavetobeprecise,justgettheBBDworking.NextadjusttheClocktrimpottothepointwhereyouachieveawidesweepwithminimumnoise.Iftheflangestartstooscillateatthebottomofitssweepyouwillneedtodoalittlemoreadjustment.GobackandtweaktheBiastrimpotfurtherclockwiseuntilyougetsmoothupanddownflangewithoutanyexcessivefeedbackoroscillationatthepeaksofthesweep.SettheFeedbackcontrolfullyclockwiseandgentlyadjustT1clockwiseuntilyougetthemaximumfeedbackdesired(T1actsasalimittothemaximumallowedfeedback).ContinuemakingminoradjustmentstothetrimmerswhiletestingthelimitsoftheRate,RangeandFeedbackcontrols.Describingthisprocessmakesitseemmorecomplicatedthanitactuallyis:yourearwillbetheguideinachievingthebestsoundacrossthewidestrangeofcontrolsettings.

Wiring

DrillTemplate125B

5.4Wx6.18H@borders

Thistemplateisapproximate.Checkmeasurementandplacementcarefullybeforecommittingtodrill.

ThereisnosinglesidedartworkforetchingaCurrentLoverPCB

Licensing

TheusermayutilizeapurchasedCurrentLoverPCBfrommadbeanpedalsforDIY/noncommercialpurposes.YoumaynotusetheartworktosellyourownversionofthePCBdesignoraspartofakitorsimilarcommercialproduct.

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