Circuit and explanation of Adjustable Strobe Light

Part Total Qty. Description Substitutions R1 1 250 Ohm 10 Watt Resistor R2 1 500K Pot R3 1 680K 1/4 Watt Resistor D1, D2 2 1N4004 Silicon Diode C1, C2 2 22 uF 350V Capacitor C3 1 0.47uF 400 Volt Mylar Capacitor T1 1 4KV Trigger Transformer (see "Notes") L1 1 Flash Tube (see "Notes") L2 1 Neon Bulb Q1 1 106 SCR F1 1 115V 1A Fuse MISC 1 Case, Wire, Line Cord, Knob For R2

Notes

1. T1 and L1 are available from The Electronics Goldmine (see Where To Get Parts).
2. This ciruits is NOT isolated from ground. Use caution when operating without a case. A case is required for normal operation. Do not touch any part of the circuit with the case open or not installed.
3. Most any diodes rated at greater then 250 volts at 1 amp can be used instead of the 1N4004's.
4. Do not operate this circuit at high flash rates for more than about 30 seconds or else C1 and C2 will overheat and explode.
5. There is no on/off switch in the schematic, but you can of course add one.

source: aaroncake.net