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Stroboscope
   
   
The 220V supply is rectified and then used to charge the two 3μ* capacitors.  
The 1μ capacitor also charges (more slowly) through the 150k resistor and 1M variable resistor.  
When the voltage across the 1μ capacitor is high enough to cause the diacs to conduct, the thyristor is triggered.  
This produces a high voltage pulse at the secondary of the transformer.  
This pulse causes the tube to conduct and a flash of light is produced.  
A,k,g are the connections to the flash tube.  
   
Resistor power 220Ω 10Watts
  12Ω 1Watt
  150kΩ 1Watt
   
Capacitor voltages 3μ 350V
  1μ 100V
 
   
As can be seen from the pcb layout, for the 3μ you can use three 1μ capacitors in parallel.  
The circuit works well with thyristor TIC116D but will probably work with lots of others.  
   
For a method of making simple printed circuit boards, like this one, see here.  
   
Printed circuit board, copper side  
 
   
   
Printed circuit board, component side  
 
   
As shown in this photo, I managed to find a couple of 2.2μ capacitors (to replace the 3μ) and it works fine with those.  
   
 
   
PS  
I imagine you could make a pretty good stroboscope using modern white leds thus avoiding all the dangerous high voltage stuff but, hey, you only live once...  
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