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Stroboscope

18

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.
Printed circuit board : Component Side

Printed circuit board : Copper Side

 
N.B.    
  Resistance powers: 220 ohms 10 watts
    12 ohms 1 watt
    150k 1 watt
...
  Capacitor voltages: 3µ 350v
    1µ 100v
  *For the 3µ capacitors, use three 1µ capacitors in parallel (as shown in the component side diagram).

Acknowledgements : The stroboscope was taken from an excellent French electronics magazine (sadly, no longer published) called "Elex".

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