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rangemaster (treble boost)

6
1 Controls BOOST: This control provides over 20dB of gain as it is turned up. (metal film resistors are recommended) T/M: The Treble/Mids switch allows you to switch between treble boost and a more full range boost (depending on what value you select for C2). Build Notes This is a positive ground effect! It is necessary to use either battery, a power supply with isolated 9v supplies like the Voodoo Pedal Power or a voltage converter like the Road Rage to power the effect. Current draw is very low without an LED, so a battery will last a very long time. The stock input cap is 5n. These are pretty hard to come by in the States. You can sub either a 4n7 or 5n6 in its place. If your DMM has a capacitance measure feature, you could pick up a few 5n6 and try to find one that measures closer to 5n. C2 can be placed in parallel with C1 via the T/M switch. The value you choose for C2 has a direct effect on what range of frequencies the boost is applied to. The larger the value the more range available. Note that too high of a value may cause some flabbiness in the bottom end of the guitar, so 10n to 22n is suggested. All of the caps have extra pads so that you can use either axial or radial type capacitors. The lead spacing for the radial pads is 5mm for film, and 2.5mm for electrolytic. For axial film, the spacing is about 18mm. For axial electrolytic it is 20mm. You may also use a shortpin PCB mounted pot for this build: http://www.smallbearelec.com/Detail.bok?no=692 You can find a number of suitable transistors for the Rangemaster at www.smallbearelec.com For more info on the history and inner workings of the Rangemaster, have a look at R.G. Keen’s article: http://www.geofex.com/Article_Folders/Rangemaster/atboost.pdf The Rangemaster is a classic treble booster that has a long history in the world of guitar effects. Its unique character is that it boosts high frequency content to make notes on the guitar sing when playing lead. This type of effect is most suited for tube based amps and is not recommended for solid state devices. This version also allows you to use an additional switch and cap to make into a midrange or full boost. http://www.madbeanpedals.com presents rangemaster FX TYPE: BOOST PCB artwork m2011 madbeanpedals Release date: 06.01.11

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Rangemaster (Treble Boost)

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  • 1

    Controls

    BOOST:Thiscontrolprovidesover20dBofgainasitisturnedup.(metalfilmresistorsarerecommended)T/M:TheTreble/Midsswitchallowsyoutoswitch betweentrebleboostandamorefullrangeboost(dependingonwhatvalueyouselectforC2).

    Build Notes

    Thisisapositivegroundeffect!Itisnecessarytouseeitherbattery,apowersupplywithisolated9vsuppliesliketheVoodooPedalPoweroravoltageconverterliketheRoadRagetopowertheeffect.CurrentdrawisverylowwithoutanLED,soabatterywilllastaverylongtime.

    Thestockinputcapis5n.TheseareprettyhardtocomebyintheStates.Youcansubeithera4n7or5n6initsplace.IfyourDMMhasacapacitancemeasurefeature,youcouldpickupafew5n6andtrytofindonethatmeasurescloserto5n.

    C2canbeplacedinparallelwithC1viatheT/Mswitch.ThevalueyouchooseforC2hasadirecteffectonwhatrangeoffrequenciestheboostisappliedto.Thelargerthevaluethemorerangeavailable.Notethattoohighofavaluemaycausesomeflabbinessinthebottomendoftheguitar,so10nto22nissuggested.

    Allofthecapshaveextrapadssothatyoucanuseeitheraxialorradialtypecapacitors.Theleadspacingfortheradialpadsis5mmforfilm,and2.5mmforelectrolytic.Foraxialfilm,thespacingisabout18mm.Foraxialelectrolyticitis20mm.

    YoumayalsouseashortpinPCBmountedpotforthisbuild:http://www.smallbearelec.com/Detail.bok?no=692

    YoucanfindanumberofsuitabletransistorsfortheRangemasteratwww.smallbearelec.comFormoreinfoonthehistoryandinnerworkingsoftheRangemaster,havealookatR.G.Keensarticle:http://www.geofex.com/Article_Folders/Rangemaster/atboost.pdf

    TheRangemasterisaclassictrebleboosterthathasalonghistoryintheworldofguitareffects.Itsuniquecharacteristhatitboostshighfrequencycontenttomakenotesontheguitarsingwhenplayinglead.Thistypeofeffectismostsuitedfortubebasedampsandisnotrecommendedforsolidstatedevices.Thisversionalsoallowsyoutouseanadditionalswitchandcaptomakeintoamidrangeorfullboost.

    http://www.madbeanpedals.com presents

    rangemaster

    FX TYPE: BOOST PCBartworkm2011madbeanpedals

    Releasedate:06.01.11

    http://www.smallbearelec.com/Detail.bok?no=692http://www.smallbearelec.com/http://www.geofex.com/Article_Folders/Rangemaster/atboost.pdfhttp://www.madbeanpedals.com/

  • 2

    Layout Diagram1.2Wx1.5H

    ThisPCBwillfitina1590B

    Bill of materials

    R1 68kR2 3k9R3 470k

    C1 5nC2 1022nC3 47uFC4 10nC5 47uF

    D1 1N4001

    Q1 OC44

    T/M SPST

    BOOST 10kA

    Switch

    Pots

    Resistors

    Caps

    Diodes

    Transistors

  • 3

  • 4

  • 5

    Singlesided version

    1.34Wx1.64H(includingborders)

  • 6

    TermsofUse

    ThisPCBmaybeusedfreelyforcommercialapplicationswithoutpriorpermissionornotification.Thereisnolicenserequiredtodoso.

    build.share.learn.


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