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HVsupply:12VDCin,12KVout(FromSamGoldwasser)

SimpleHighVoltageGenerator-12Vin,12,000Voutinverter.Modifyappropriatelyfor24Vin,30,000+out,lowerpower.

*VCCQ1+-----------------C||o|C|||B|/CC|||+------|2N3055C|||||\E5TC||C-------|>|----------o+HV|||C||CHVDiode,usually||-_-C||Cbuiltin||C||C+--|--------------------------C||C||Q2_-_C||C|||C||CSecondary(HV)winding,||B|/E5TC||Cintact.||----|2N3055C||C||||\CC||C||||C||C|||+-----------------C||C|||||C||------------------------C||C-------------------o-HV

||2TC||||+----------C|||||2TC||T1-Flybac

transformerfromBW|+--------------------------C||orcolorTVorcomputermonitor.|||R1|R2+----------/\/\/\--+--/\/\/\---+11027_|_2W5W-

ReadinEntirety!

1.Obtainflybac

transformerwith

nowngoodHVsecondarywinding.primarymaybeleftintactifitis

nowntobeingoodcondition-nonshorted.Aflybac

removedduetofailuremaybeusedifitwastheprimarythatfailedandtheprimaryturnscanberemovedwithoutdamagingtheHVsecondaryorlosingthesecondaryreturnconnection!Flybac

sfailinbothways(primaryandsecondary).

2.Wind10turncentertappeddrivewindingand4turncentertappedfeedbac

windingusing#16-20guageinsulatedwire.Ma

esurebothhalvesofeachcoilarewoundinsamedirection.

3.VCCshouldtypicallybeintherange12-24voltsatacoupleofamps.Circuitshouldstartoscillatingataround5voltsVCCorso.IfyoudonotgetanyHVout,interchangetheconnectionstothetransistorbases.Heatsin

sareadvi

sedforthetransistors.Beawareofthecapabilityofyourflybac

(BWmonitorsupto15KV,colorupto30KV).Youris

destroyingthesecondarywindingsand/orHVrectifierifyougetcarriedaway.Runningthison24voltswillprobablycauseaninternalarc-overinasmallflybac

,atwhichpointyoustartoverwithmorecautionandanewflybac

.

4.Actualoutputwilldependonturnsratiooftheflybac

youhave.Fortypicalmonochromecomputermonitorsorvideodisplayterminals,youshouldbeabletogetaround12,000voltswith12voltsinput.ImadeonefromadeadMacPlusflybac

fromwhichIremovedthe(dead)primarywindings.

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5.FrequencyofoperationwillbeintheKHzto10sofKHzrangedependingonVCC,load,andspecificflybac

characteristics.

6.Youcanexperimentwith#turns,resistorvalues,etc.tooptimizeoperationandpoweroutputforyouneeds.

7.CAUTION:contactwithoutputwillbepainful,thoughprobablynotparticularlydangerousduetolow(afewmA)currentavailability.HOWEVER,ifyouaddahighvoltagecapacitortostorethecharge,don'teventhin

aboutgoingneartheHV!