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Stroboscope

18

 

The 220v supply is rectified and then used to charge the two 3* capacitors. The 1 capacitor also charges (more slowly) through the 150k resistor and 1M variable resistor. When the voltage across the 1 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:

3 350v

   

1 100v

 

* For the 3 capacitors, use three 1 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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