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Page 1: Bipolar Tesla Coils - K.R. Scott.pdf
Page 2: Bipolar Tesla Coils - K.R. Scott.pdf

BipolarTeslaCoils:

Experimenter’sGuide

K.R.Scott

Copyright2016

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PREFACE

Thistextisnotmeanttobeadetailedengineeringdocumentonhighvoltagedevices.Itiswrittenfor

educationalandinformationalpurposesonly.Thereisnohighlevelmath,theoryoranalysis.Thecontentsareacollectionofempiricalexperiencefrommakinghighvoltageequipmentovertheyears.Thereisanenormousamountofinformationonlineandinbooksforthosewhowantthereallytechnicalstuff.Whenbuildingthesedevices,youcanonlycalculateenoughdetailtogetyouintotheballpark,andthenitisalittletrialanderror,goodengineeringpractice,testing,fixingandre-testing.Thisisnotanindepthstudy;itisbasicnutsandbolts.Iamaretired(semi-retired)engineer,andforme,itisaboutthe”funfactor”,solet’sletourcuriositygowild,havesomefunandbesafe.

Regards,K.R.Scott

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HighVoltageExperimenterSeries

Willow-TechPublishing

©Copyright2016K.R.Scott

©Copyright2016Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,ortransmittedinanyform,orbyanymeans,electronic,mechanical,photocopied,recorded,orotherwise,withoutthepriorwrittenpermissionofthecopyrightowner.

DISCLAIMER

Theauthorandpublisherhavemadereasonableefforttopresentthisinformationasclear,conciseandaccurateaspossible.However,theycannotbeheldresponsiblefortheuseormiss-useofthismaterial.Wearenotliableforanydamagesincluding(butnotlimitedto)personalinjury,propertydamageorlegaldisputesarisingfromtheuseofinformationcontainedinthisbook.

DONOTUSETESLACOILSAROUNDPACEMAKERS,INSULINPUMPS,ORHEARINGAIDS.

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BipolarTeslaCoilsoldbyCENCO1920s

IpurchasedthiscoilonEbay.

Withtheexceptionofcleaning,itisinverygoodshape.IusedtheTeslaCADprogramtocalculatethecapacitorvalue,Iwiredituptoasparkgapanda9kV/30maneontransformeranditworkedgreatafter95years!Mainproblemwasdustonthecoilwhichcameoffwithapaintbrush.Dustonasecondarycoilwillreduceoutput.Theresidualelectrostaticchargeonthesecondaryattractsdust.

CencoBipolarTeslaCoil

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BipolarTeslacoiloperatein½wavemodewhereasthetypicalverticalconfiguredcoilswiththebottomendofthecoilgrounded,operateinthe¼wavemode.The¼WaveTeslaCoilhasthesecondarycoilgroundedandisslightlymoresensitivetotuningandcouplingthanaBipolarTeslaCoil.OnBipolarCoilsthecouplingisinthecenterareaofthesecondarywithlessproblemofracingsparkstypicallycausedbytootightcouplinginthe¼wavecoiland/orinsulationbreakdown.A¼wavecoilcanbemoredangerousasinsomeconfigurations,ifthereisashort,oraconductivespark(racingsparks)60Hzcurrentcanbecarriedonthesecondary’shighfrequencycurrent(lessisolationbetweenprimaryandsecondary).Thereisoneincidentinthe1910s,whenthishappenedtoastageperformerandhewaselectrocuted.ABipolarTeslacoilsomewhatactslikeanisolationtransformerasthesecondaryisnotgroundedandisinsulatedfromtheprimarycoil.ThebipolarTeslaCoilwillgivebetterperformancethanthe¼wavecoilandthedischargesaremoreimpressive.YoucanforcetheBipolarCoiltooperateinthe¼wavemodebygroundingoneend.AdescriptionofaHVdischargewandfordrawingsparksinthisconfigurationisinthelastsectionofthisbook.

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Fig.BisthecircuitthatIprefer,asthesparkgapactsasbothanoperatingsparkgapandasasafetygap.Thecapacitorseeemstorunalittlecoolerandislesslikelytofail.Onethingthatcanbedone,especiallywithdoorknobtypeceramiccapacitors,istoaddacoupleoffenderwashersseperatedbyanutoneachendofthecaptoactasaheatsink.Capacitorscanalsobepottedinparaffinforextrainsulationandtheparaffinabsorbsalotofheatbeforeitwillmeltandactsasaheatsink.Youcanalsotrydifferentcombinationsofparaffinandcanolaoil.Beeswaxworksverywell.Manyoftheoldhighvoltagecoilsanddeviceswhereinsulatedusingamixtureofbeeswaxandrosin.Beeswaxandlinseedoilwillmakeakindofselfhealinginsulationgel.Tryvarousmixturesmeltedtogethertogettheconsistancyyouwant.CanolaoilisusedasabaseingrediantforsomeHVinsulatingoils.Itisoneofthenon-toxicreplacementforPCBs.(PolychlorinatedBiphenyls)Verytoxicandisstillfoundinoldtransformers,especiallypolepigsandoilfilledcapacitorsbuiltbefore1979.

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OneofTesla’sexperimentalcoilsetups.

G–Electricalpowersource

P–PrimaryDriveTransformer

S–SecondaryDriveTransformer

A,B–SparkGapElectrodes

M–Sheetmicaconfiguredclosetoelectrodestopromoteairflow.

C,C–LeydenJars(Selectedforequalcapacitancevalue”

a,b-Sparkgapcloselyadjusted.

K,K-HighVoltage/HighFrequencysecondarycoiloutput.

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ThisisaschematicofElihuThomson’s(1853-1937)DisruptiveDischargeCoilbasedonTesla’spatent#454,662.Drivetransformer:15-20kV.Compressedairquenchedsparkgap.Primary:15-20turnsheavycopperwire.Secondary:150turnsfinewireiswoundonaglasscylinder.Thecoilswhereemergedinatankofboiledlinseedoil.Thiscoilproduced150kV.SomeofThomson’slatercoilsproducedsparksover60incheslong.

SPARKGAPS

Asparkgapwillarcinsteadofsparkingifthecurrentgoingthroughit,istohighi.e.usingaMOT(MicrowaveOvenTransformer–typically2,500volt@500maor5,000voltsDC(whenusingthediodeandcapacitorvoltagemultiplierthatwasinthemicrowaveoven.APoleLinetransformers(PolePig)wiredbackwardswillincinerateasmallorpoorlymadesparkgaps.IfyouaregoingtousethismuchenergytodrivetheTeslacoilyouneedtousearotarysparkgapormulti-gap.Inthiscase,theelectrodesneedtobetungstenandaircooled.Note:Thesetypesoftransformersaremoredangerousthanneonsignoroilignitiontransformers.Whenanaccidentalcontactoccurs,thereisaveryhighprobabilityofelectrocutionorattheleaseverybadburns.Otherhazardswithsparkgapsareacoustic/electricalnoise,hardUVlight,shockhazards,fireandtheproductionoflargequantitiesofOzoneandNitrogenOxides.Ozonehasaverypungentsmell.Youneedgoodventilationandoutsideair.

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SOMEGENERALOBSERVATIONSABOUTSPARKGAPS

Multi-gapsarebetterthanasinglegap.

Rotarygapsarethebestperforminggaps.

Gapelectrodematerialsandgeometryeffectperformance.

Bestelectrodematerialistungsten.Thoriatedtungstenandspotweldingelectrodesalessexpensive.

SparkGapsneedtobecooled.

Airblastquenchingworkswellandifdrynitrogenisused,theyworkevenbetter.

Youcanquenchasparkgapwithstrongrareearthmagnets.N–Spolesacrossthespark.

SparkGapscontinuallyburnopen(widergap)andwillneedtobeadjusted

NeveradjustSparkGapwithpowerplugpluggedinandnevertrustaswitchtobeoffastheycanshortinternally.

Alwaysdischargethetankcapacitor–leavegroundstraponasthecapscanregenerateacharge!

Donotstareatthegapinoperation–hardUVcanburnretina(weldersburn–fellslikesandinyoureyeswherethereisnone).

Asinglestaticparkgapneedstobeadjustedaswideaspossiblebutstillworkreliably.

Seriesgapsareadjustedclosertogether.

SAFETY

ThebestTeslaCoilsafetywrite-uponlinehasbeencreatedbyseveralcoilersandisavailableasanhtmdocumentat:

http://www.pupman.com/safety.htm

“pupman.com”isagreatsiteforinformationandhasbeeninusefromtheearlydaysoftheinternet.

Youcansignupat:

http://[email protected]

Therearehundredsofcoilersthatcontributetothissite.Lotsofstufffromthereallygreatcoilers.

Someofthegeneralsafetyissuesareasfollows:

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Electrocutionhazard,especiallyfromthehighthevoltagedrivecircuit,sparkgap,primarycoil.

Alsobeawarethatifthereisashortorgroundfaultthatthethelowerfrequency60Hzcurrentcanbecarriedthroughthesecondarycoilalongwiththehighfrequencyhighvoltagecurrent.TherewasastageperformerthatdidanactwithalargeTeslacoilthatwaselectrocutedintheearly1900sthisway.ThereisalsoonecaseonrecordofasmallchildthatwaselectrocutedfromanunattendedTeslaCoilinthefather’sbasementworkshop.Nevertrustaswitch,ALWAYSunplugthecoilandputashortingwireacrossthecapacitor(s).ThedischargesfromthecoilcancauseburnsfromheatandinsomecasesRFburns.Dischargescancausefirewhencombustiblematerialsarepresentandanexplosionifcombustiblefumesareinthearealikeacetone,cleaningsolvents,PVCglue.IhavewitnessedoneexplosionofaPVCsecondarycoilthatwasputtogetherwithPVCglueandtheresidualvaporswhereignitedinsidethecoilform(voiceofexperience).ThehighvoltagedischargesfromthesparkgapandcoilterminalwillcreatehardUVlight,ozoneandnitrogenoxides.Theozonewillirritatethethroatandsinusesandthenitrogenoxidescanproducenitricacidwhencombinedwithmoistureinthelungsandcanproducechemicallyinducedpneumonia.TheUVlightcanburntheretinaandcause“weldersburn”Properventilationandeyeprotectionisneeded.TheintenseRFradiationproducedbytheTeslacoilcandamagesensitiveelectronicequipment,especiallyTVremotecontrols,cellphone,iPods,etc.

NoisehazardsfromsparkgapandHVdischarges,especiallyrotarysparkgaps.Youcanbestartledbyashockfromtheelectrostaticchargethatcanremainonsurfaceofsecondarycoil,(especiallyifitisalargecoilwithalotofsurfacearea)aftertheTeslaCoilhasbeenturnedoff.

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DriveTransformer:NeonType9kV/30ma

SecondaryCoilwinding2.4”x10”#26AWG520Turns

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PrimaryCoil:3.5”DiameterTunes@11-1/2Turns

Capacitor:2ea1000pF/20kVinparallel=2000pF

DualStaticSparkGap(SteelandBrass)

ThecalculationswheremadeusingTeslaCAD

forthisparticularBipolarTeslaCoilareasfollows:

Createdby:RichardChapman

http://www.richardsplace.net/tesladownload.htm

Note:ThisprogramwillworkwithWindows10

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Donotusewirediametersfromcommercialwirecharts.Wind/countturnsfor1inchanddivideby#turnstogetgoodwirediameter.Example:#26AWGis52Turns/inchdividedintoone=0.01923.Setthespacingbetweenturnsto:“0”.

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Calculationsforcapacitorvalueforlinematching.

TeslaMapisanotherpopularCADprogram.

http://www.teslamap.com/download.html

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Secondarycoil:2.4”x9”470Turns#26AWG

PrimaryCoil:Tunesat11Turns

Capacitor:2ea.1000pF/20kVTotalCapacitance2000pF

Tested/operatedwith9kV/30maneontransformer.

Baseishardwooddrawerfront.

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Theelectrodesaremadefrombrazingrod,threadedwith8-32threadswiththreadedbrassballsontheends.Therodswheregroundtoapointwithabeltsanderononeendandthenthreaded.Thiswayyoucanhavepointedorsphericalelectrodes.Thesecondarycoilsupportsarefromendsofanewwoodentoiletpaperdispenser.Thereisashortbrasstubeinadrilledholethatgoestothecoilelectrodeends.

Brazingrodsinavarietyofdiametersaresoldbythepoundatanyweldingsupply.Thebrassballswherepurchasedfrom:http://www.grandbrass.com/

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SecondaryCoil:1.875”x10”#26AWG520Turns

PrimaryCoil:4.5”DiameterTunesat8-1/2Turns

Capacitor:1200pF/20kVCeramic

DriveTransformer:5KV/10maOpenFrameNeon

Baseishardwoodtrayturnedupsidedown

SparkGapBrassandSteelAngle

bracketsandstainlessmachinescrews

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SecondaryCoil:1.875”x11”#26AWG

Primary:CoaxCableShieldsbraid&Centerconductorused.

Tunedat:10-1/2Turns

Capacitor:1000pF/25kV-NAVYMica/Ceramic

DriveTransformers:2ea3.5KVWiredfor7kV

LineFilterused(rightsideofunit)

SparkGap:Brassandsteel

Baseisanewhardwoodcuttingboard+4RubberFeet.

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SecondaryCoil:1.875”x10”#26AWG

PrimaryCoil:CoaxCableTunesat10Turns

Capacitor:1300pF/18kVCeramicDoorKnobType

Transformer:5kV/10kV/10maOpenFrameNeon

SparkGap:BrassandSteel

Base:HarwoodDrawerFace

4Turnedlegs.

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Secondary:2.4”x8”420Turns#26AWG

Primary:#12AWGTunesat:11Turns

Capacitor:1200pF/20KV

DriveTransformer:5kV/10ma

SparkGap:SteelandBrass

Box:Madeinmywoodshop.

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SecondaryCoil:2.4”x7.5”#26AWG400Turns

Primary:Tunes@11Turns

Capacitor:2ea690pF/20kVTotalCap=1380pF

SparkGap:SteelandBrasswith12VMuffinFan

Baseissmallfinishedshelf.

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Secondary:2.4”x9”#26AWG470Turns

Primary:3.5:ODTunes@11Turns

Capacitors2ea690pF/20kVTotalCap:1380pF

DriveTransformerAutoIgnitionCoil

SparkGapBrassandSteel

Theignitioncoilisdrivenusingalightdimmer

anda2ea1uF/350VMotor“RUN”Capacitors

DONOTUSEMOTORSTARTCAPS!

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SecondaryCoil:1.875”x12”#26AWG625Turns

PrimaryCoil:Tunes@10Turns

Capacitor:2000pF/30kV

DriveTransformer:7.5kV/30ma

SparkGapStainlessSteel

RemoteON/OFFSwitch

Base:hardwoodDrawerfrontandturnedlegs

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SecondaryCoil:1.875x12”#26AWG625Turns

PrimaryCoil:Tunes@10-1/2Turns

Capacitor:2000pF/30kV

DriveTransformer5.0kV/10maOpenframetype.

SparkGap:Stainlesssteel

BaseisrepurposedwoodKleenexbox.

Secondarysupport:Redoak@T-Paperholderends.

Terminals:Brazingrodand1.2”brassballs.

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BipolarTwinTeslaCoilConfiguration

SecondaryCoils:2.4”x8”#26AWG420Turns

Primary:TVCoaxCableTunes@10Turns

Note:Primarycoilsarereversewound.

Capacitor:2ea690pF/20kvTotalCap:1380pF

Base:RepurposedJewelryBox.

SparkGap:Brassandsteel.

TopLoadTerminalsare:Brassdoorknobs.

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SecondaryCoil:3.5”x30”#26AWG,1,560Turns.

Primary4.5”DiameterTunes@11-1/2Turns

Capacitor:0.02uF/15kV

SeriesSparkGap4ea.SparkPlugs&12VMuffinFan.

HousingConsoleTable,Reinforcedwithwood.

Variac(autotransformer),ON/OFFToggleSwitch

Drawerknobremoved&replacedwithredjeweledindicatorlamp.

Two5kVDriveTransformersTotal:10kV.

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Electrodessolidgauge#10AWG/brassballs/crimpterminals.

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Hotmeltglueworkswellforinsulatingwireconnectionsandhardware.

DrillintowoodwithaForstnerdrillbit,usewasherwithscrew.

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MusicalBipolarTeslaCoil

RegionalMuseumJohnsonCityTennessee

http://roadsideamerica.com/tip/44988

Page 39: Bipolar Tesla Coils - K.R. Scott.pdf

http://www.pictorialism.com/tesla.html

Locatedin:BigBearLake,CA

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HVDischarges

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Dischargesthroughclearlightbulb.

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Dischargesriseincenterduetoheatedions/air.

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1930

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KinraideCoilEarly1900s

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HerculesTesla-ThomsonElectrotherapyUnit1907

Bipolarcoilsecondaryisgrounded(centerelectrode).

RotarySparkGap.

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1915

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1918

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1930sPopularScience

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Gaiffe’sBipolarResonatorusedinelectrotherapyearly1900s.ManufacturedbyAdolpheGaiffeinParis

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1891BipolarTeslaCoilpresentedtoLordKelvinin1897ThistypeinventedbyNikolaTeslain1891

25Watts@110VDCInput

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ElectricalExperimenterJuly,1919

FreeDownloadArchivehttp://www.electricalexperimenter.com/

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COILWINDING

ThesmallcoilwinderthatIuseisfabricatedfromanoldmechanicalfilmwinder,threadedrodstock,andtwoplasticfunnels.Itworksverywell.Itisfastandeasytocontrol.IgetbettercontrolusingamechanicalcrankthanIdidfromamotorizedwinder.

Afewhintsoncoilwinding.

Wherethincottonglovesand/orwashyourhandsbeforewindingthecoil.Avoidgettingoilandsaltfromyourhandsonthewire.Useanew3-4”paintbrushtokeepdustofthecoil.(Especiallybeforecoating)Sandthecoilformwithfinesandpaperandcleanwithalcoholbeforewinding.NoSteelWool!Theareawherecoiliswoundneedstobewarm–donotwindcoilincoldworkshopasthewirewillexpandandloosenthecoilwhenitiswarmedup.Coatthecoilwithseveralthincoatsofinsulatingspray.Thebest,mostcosteffectivespraythatIhavefoundisRust-OleumCrystalClearEnamel,itisaverygoodinsulatoranditdriesquickly.Thebesttechniqueistohaveafixturewherethe

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coilcanbeslowlyrotated–amicrowaveovenmotorworkswell–thiswillreduceruns.Donotusedatafromwirechartsfor#ofturns/diameterorwire–handwindandinchfor#ofturns.Example#26AWGis52Turns/inch,1/52=0/01923Diameter.Usethis#TeslaCAD.

DischargeWand

Note:Thewireexitsthewandattopforsafety.

MaterialPVCElectricalConduit.

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TerryFilterforprotectingdrivertransformerandhomeelectricalsystem

http://www.hvtesla.com/terry.html

ExceptionallywellmadeTerryFiltermadeforalargeTeslaCoil.

http://ian.macky.net/tesla.html

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KEEPTHESEDEVICESAWAYFROMCHILDREN,PETSANDINDIVIDUALSNOTFAMILUREWITHHIGHVOLTAGESAFETY.IFYOUAREINEXPERIENCEDINWORKINGWITHTHETYPESOFDEVICESDESCRIBEDINTHISMANUAL,PLEASESEEKHELPFROMAPERSONWHOKNOWSHOWTOSAFELYWORKWITHHIGHVOLTAGEDEVICES.PLEASESEETHEWEBLINKSLISTEDATTHEENDOFTHISMANUALFORADDITIONALINFORMATION.More people are killed each year by low voltage than by high voltages. Themost commonelectrocutionhazardis110and220voltsAC.Theamountofcurrentthatpassesthroughthebodydetermines the physiological damage. If electrical contact is made to a person whose skinresistanceisloworbysufficientlylargecontactarea,enoughcurrentcanpassthroughthebodytocauseburns,damagetonerves,musclesordeath.Youcanbecomepartoftheelectricalcircuit,evenwhenungroundedandstillbeelectrocuted.Highvoltagescanpenetrateinsulationmaterials,orjumpthrutheairtofindapathtoanunwaryexperimenter’sbody.Itisnotadvisabletoworkalone. Capacitors can hold a lethal charge for several days and can partially recharge due todielectric retention after discharging and shock the experimenter. Electrolytic capacitors canexplodeviolently if thevoltage rating is exceeded;ACcurrent is applied (shorted rectifier)orhookedupbackwards.Capacitors thataredischarged through lowresistance loadsuchas lowresistance,wires(smalldiameterwire,coilsresisters,etc.)cancauseanexplosionandsprayhotmetal and sparks. High voltage can cause fires and/or explosions if combustible vapors arepresent.Electricaldischargesunderfluidssuchasoilcancausethefluidtoexpandwithexplosiveforce.Discharges in a vacuumcanproduceX-raysunder some circumstances.Ozone (O3) isproducedinelectricaldischargesandcanreachtoxiclevelsifventilationisnotadequate.BeawarethatTesla,OdinCoilsandsparksgapsproduceelectricalinterferencewithTVandradios.Youneed to shield both the power line feed and airwaves from this. Use RF line filtering and agroundedFaradaycage.

CHECKOUT:http://pupman.com/safety.htm

See:“Skineffect”onwebsite:http://en.wikipedia.org/wiki//Teslacoil

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TESLACOILDESIGNBOOKS

TheUltimateTeslaCoilDesignandConstructionGuidebyMitchTilbury2007

UnderstandingTeslaCoilsandBeyondbyBrentTurner2013

DRSSTC:BuildingtheModernDayTeslaCoilbyDanielMcCauly2006

TheTeslaHighFrequencyCoil:It’sConstructionandUses1912

VintageTeslaCoilandHighVoltageBooks-GreatInfo…

ThesebooksareavailableasFREEdownloadsinpdfformatfrom:

https://books.google.com/

https://archive.org/details/googlebooks

https://www.gutenberg.org/

https://openlibrary.org/books

TheInventionsandwritingsofNikolaTeslabyThomasCommerfordMartin504Pages1894TheTeslaHighFrequencyCoil:ItsConstructionandUsesbyGeorgeF.Huller160Pages1910CurrentsofHighPotentialofHighandOtherFrequenciesbyWilliamBenhamSnow,M.D.302Pages1911HighFrequencyApparatus,Design:ConstructionandPracticalApplicationbyThomasStanleyCurtis269Pages1920ExperimentalHighFrequencyApparatus:ConstructionofInductionCoilsandTransformersbyThomasStanleyCurtis269Pages1920High-FrequencyCurrentsbyFredrickFinchStrongM.D.301Pages183Illustrations1908HighVoltagePhysicsbyL.Jacob,M.Sc.105Pages1930sTheInductionCoilinPracticalWorkIncludingRoentgenXRaysbyLewisWright192Pages1897TheInductoriumorInductionCoilsbyHenryNoad,Ph.D.135PagesRuhmkorffInductionCoils:ThereConstruction,OperationandApplicationwith

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ChaptersonTeslaCoil,InductionCoilsandRoentgenRadiographybyH.S.Norrie208Pages1896

OldMagazinesources

https://archive.org/details/magazine_rack?sort=titleSorterhttps://en.wikipedia.org/wiki/List_of_online_magazineshttp://www.electricalexperimenter.com/http://www.americanradiohistory.com/Electrical-Experimenter.htmhttp://www.americanradiohistory.com/Popular-Electronics-Guide.htmhttp://www.popsci.com/archiveshttps://books.google.com/books/about/Popular_Mechanics.html?id=49gDAAAAMBAJhttps://archive.org/details/TheAmateurScientisthttp://www.electrotherapymuseum.com/Oneoftheverybestsourcesofinfo,photographs,videosandhistoricalstuffonhighvoltagedevices.

Projectsplanshttp://www.teslastuff.com/

http://www.amazing1.com/

http://www.instructables.com/

http://makezine.com/

LinkstoBipolarCoilProjects

http://www.electrotherapymuseum.com/

http://tesla-coil-builder.com/double_cone_bipolar_tesla_coil.htm

http://lateralscience.blogspot.co.uk/2012/07/main-page.html

http://ydjj.blogspot.com/2011/10/my-bipolar-tesla-coil.html

http://www.teslasociety.com/teslacoil.htm

http://thehappyheathen.com/?p=50

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http://thehappyheathen.com/?tag=tesla-coils

https://www.museumofdiscovery.org/experience/world-record-musical-bi-polar-tesla-coil

http://teslaweb.freeservers.com/tesla1.htm

http://www.roadsideamerica.com/tip/44988

http://tesla-coil-builder.com/FlatSpiralSecondaryLongitudinal.htm

http://tesladownunder.com/Tesla_coils_intro.htm

http://www.lateralscience.co.uk/tesla/index.html

http://kenscoil.com/tesla-coils/

PARTS

http://www.amazing1.com/tesla-coils.html

http://www.easternvoltageresearch.com/faq.html

http://www.teslastuff.com/

http://www.grandbrass.com/

http://prosites-llcwccd.homestead.com/