All resistors are 0,25W R1=10K R2=10 R3=470 R5=0,22 (I recommend to use 0,47 Ohm or even 1 Ohm for first tests instead of 0.22, to protects the MC34063,However charge time for the capacitor will be longer. Once the capacitor charges quickly to 160V you can reduce the resistor.) R8=180 R9=1K R10=2,4K** R11=300K** R12=330 R14=3,3K R15=4,7K R16=3,3K R17=4,7K R18=4,7K C1=47nF C2=1,5µF, 400V (at least 250Vdc) C3=1,5nF C4=2,2µF, 100V C5=22µF C6=470µF, 25V C7=100nF C8=15pF C9=15pF C10=10µF, 25V C11=100nF D1:1N4005 D2:1N4148 D3:BA189 D4:1N4148 D5:1N4148 D6:1N4148 Q1:BC327 Q2:crystal 24MHz IC2: LM7805 TO220 T1: any power SCR (Thyristor), TYN1012, BT151-800, test it out! (better mount a heatsink on the MC34063) L1: transformer from Conrad Electronics, order #:51 66 43-88 Pri: 25 turns 0.5mm wire sec: 160 turns 0,15mm wire IMPORTANT: Leave little space between ferrit halves (piece of paper on ONE Side) Layout and schematics done with Demo version of Eagle 4.11, download on www.cadsoft.de **: Tolerance 2%