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Stroboscope |
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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. |
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Printed circuit board : Component Side
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Printed circuit board : Copper Side
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N.B. |
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Resistance powers: |
220 ohms 10 watts |
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12 ohms 1 watt |
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150k 1 watt
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Capacitor voltages: |
3µ 350v
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1µ 100v |
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* For the 3µ capacitors, use three 1µ capacitors in
parallel (as shown in the component side diagram). |
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Acknowledgements : The stroboscope was taken from an excellent French electronics magazine (sadly, no longer published) called
"Elex".
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